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National Law Enforcement & Corrections Technology Center- Northwest

Operated by Chenega Technology Services Corporation

r ' R ( . ) F r Z R T Y O F �9 N~[ioilal Criminal Justica R~feronos S3rvir (NOJR$}

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Test Report of Land Mobile Radio Connectivity via Shared Satellite I P Networks and the Intemet

February 28, 2006

If you have issues viewing or accessing this file contact us at NCJRS.gov.

Funding for this report, the "Land Mobile Radio Connectivity via Shared Satellite IP Networks and the Internet" test and evaluation project, and the National Law Enforcement and Corrections Technology Center- Northwest (NLECTC-NW), was received through interagency agreement number 2003-WH- 6300-255A from the U.S. Department of Justice; Office of Justice Programs; National Institute of Justice and the U.S. Department of the Interior, awarded to Chenega Technology Services Corporation, 5971 Kingstowne Village Parkway, Suite 100, Alexandria, VA 22315.

The National Institute of Justice is a component of the Office of Justice Programs, which also includes the Bureau of Justice Assistance, the Bureau of Justice Statistics, the Office of Juvenile Justice and Delinquency Prevention, and the Office for Victims of Crime.

Additional information regarding any of the items contained within this report can be obtained from the National Law Enforcement and Corrections Technology Center-Northwest (NLECTC-NW).

This document is not intended to create, does not create, and may not be relied upon to create any rights, substantive or procedural, enforceable at law by any part in any matter civil or criminal.

Opinions or points of view expressed in this document represent a consensus of the original authors and do not represent the official position or policies of the U.S. Department of Justice. The products, manufacturers, and organizations discussed in this document are presented for informational purposes only and do not constitute product approval or endorsement by the U.S. Department of Justice, NLECTC-NW, or other entities or individuals participating in or sponsoring the project or this report. Inclusion within this document does not create any endorsement for suggested applications.

This document was prepared by:

NLECTC-NW

3000 C St. Ste. 304

Anchorage, Alaska 99503

1-866-569-2969

Table of Contents

Abstract

Executive Summary

Objective and Scope

Objectives

Methodology

Satcom Systems

Tested and evaluated Satcom systems:

VolP Gateways

Tested and evaluated VolP gateway equipment:

FirewallNPN Devices

Tested and evaluated Router/FirewallNPN equipment:

Common Gateway Radio Platform

Evaluation

Developmental Engineering and Other Issues Encountered

General Results

Communications Reliability

Security Considerations

Conclusion

Summarized session findings:

Areas Requiring Further Testing & Evaluation:

Communications Test Report

INTRODUCTION:

EXECUTIVE SUMMARY:

Summary Results:

PURPOSE AND DESCRIPTION OF THE TEST:

TEST METHODS:

TEST RESULTS:

TIMING EVENTS

TIMING EVENTS FOR A DIRECT RADIO TO RADIO CALL IN DIGITAL MODE:

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TIMING EVENTS FOR A RADIO TO RADIO CALL IN DIGITAL MODE VIA A TRUNKING SITE:- 21 -

TIMING EVENTS FOR A DIGITAL CALL VIA SATCOM LINK: - 24 -

AUDIO PATTERN ANALYSIS

TABULAR RESULTS AND COMMENTS:

OTHER POSSIBLE VARIATIONS IN THE INTERCONNECTION OF RADIO SYSTEMS:

SYSTEM IMPLEMENTATION RECOMMENDATIONS:

VENDOR SPECIFIC COMMENTS:

Satellite Vendors

Network Vendors

IP Gateway Vendors

VPN Vendors

AREAS FOR FUTURE EXPLORATION:

CONCLUSIONS:

GLOSSARY:

APPENDICES:

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iii

Land Mobile Radio Connectivity via Shared IP Satellite Networks and die Imcrnel

Abstract The National Law Enforcement and Corrections Technology Center - Northwest's (NLECTC-NW) Land Mobile Radio Connectivity via Shared Satellite IP Networks and the Internet Test and Evaluation Project goals were to conduct limited, impartial, test and evaluation of commercial off-the- shelf equipment and affordable commercial satellite systems that might prove successful in linking remote public safety communications systems to larger urban, land-based, communications networks. Tests were conducted using commercially available Voice over Internet Protocol gateway equipment, satellite communications services, and network element equipment. The testing and evaluation focused on public safety land mobile radio communications links between urban areas and vastly remote Alaskan communities. The tests evaluated and demonstrated voice over Internet protocol inte~ace units, voice-grade satellite communications (Satcom) services, as well as Satcom optimized virtual private network products. This test report describes a limited, impartial, test and evaluation of commercial off-the-shelf equipment that could potentially provide these links. Session test results indicate remote users of "rural" land mobile radio systems can be connected to users on the current mainland Alaska Land Mobile Radio system (and other similar systems) - with some caveats. Connections can utilize low-cost shared satellite Internet protocol (IP) connectivity and the Internet, given highly tailored network design and equipment choices. Although the tested technology implementation may not meet all federal agency security requirements without additional equipment, identified communications links provided a promising and adequately secure transport means for local, regional, and state and public safety agencies.

- 1 -

Land Mobile Radio Connectivity via Shared IP Satellite Networks and the Internet

Executive Summary NLECTC-NW's Land Mobile Radio Connectivity via Shared Satellite IP Networks and the Internet Test and Evaluation Project, and its Test and Evaluation (T&E) sessions, addressed an issue that has plagued remote U.S. public safety communications, especially remote Alaskan communications; they all lack cost effective radio, telephonic, and data communications with urban centers. Due to their vast physical separation from the established telecommunications infrastructure, Alaska's rural communities and associated public safety offices have only one option for voice, video, and data communications - Satellite Communications (Satcom). Agencies throughout the US have similar challenges when they respond to critical incidents or disasters outside their normal radio coverage areas.

Project objectives were to test and evaluate commercially available Voice over Internet Protocol (VolP) gateway equipment, Satcom services, and network equipment to determine if, and how well, they could support efficient, cost-effective, and secure voice and data communications between urban and rural locations. The testing and evaluation focused on public safety land mobile radio communications links between urban areas and vastly remote rural communities, and utilized the Alaska Land Mobile Radio System (ALMR). Project results indicate distant users of rural radio systems can be cost-effectively connected to subscribers on urban systems, including ALMR, Alaska's newest and largest LMR system.

Alaska Land Mobile Radio System: ALMR

The ALMR System is a new, state-of-the-art, "statewide," P-25 standards-based digital land mobile radio system. Unique in the United States, ALMR relies on shared infrastructure and shared federal/non-federal frequencies provided by the project participants: Local agencies, regional governments, state agencies, federal civilian agencies and the US Department of Defense. Statewide, the system began beneficial use in 2005. Beyond the "road system," where traditional telecommunications networks support the system, deployment has been delayed until resolution of the challenge presented by extending the network into areas where terrestrial communications are not available.

NLECTC-NW completed 30 days of testing sessions and determined the feasibility of interconnecting the mainland ALMR system with potential rural or "bush" land mobile radio sites scattered across the State of Alaska. Results are expected to be transferable to other LMR systems and remote locations, nationwide.

Testing indicates that users of rural analog or digital land mobile radio systems can cost-effectively connect to subscribers on core LMR systems. The sessions evaluated products and services having potential to provide practical, but not perfect, rural-to-urban

VolP connections. This potential does have some caveats that must be considered before deploying an operational system relying on this technology. For example; vendors do not consistently "certify" connectivity using Satcom as reliable enough for "mission critical" communications.

While it is unlikely these Satcom connections may ever be relied upon in a "shoot - don't shoot" scenario, as the typical deployment would be to interconnect an existing LMR system serving the day to day operations in a remote area to a larger or regional interoperable network, it is quite likely they

- 2 -


would be relied upon to coordinate aid and response in disasters or provide voice communications where none existed before.

Security constraints also require clarification. While tested configurations will meet the security needs of nearly all local and State public safety agencies, they currently do not meet the end-to-end encryption needs of many federal agencies, without the addition of other security equipment. Many of the vendors participating in this evaluation indicated that they were addressing this issue in future products.

Testing did clearly demonstrate that VolP links via lower-cost Satcom systems are viable today, yet they do require careful equipment choices and modest engineering efforts leading to a tailored interface network design. These include such engineering requirements as optimized voice-grade satellite Wide Area Network (WAN) circuits, as well as Local Area Network (LAN) systems optimized for recognizing and handling Quality of Service (QoS) based, and, potentially, encrypted data. Equipment selected must be capable of tolerating the delays caused by the satellite connection; for example, some popular networking equipment evaluated during this test was unable to tolerate the delays.

Testing also determined that, via two of the session's more robust and secure Satcom connections, other digital information could be simultaneously passed over the same satellite connection while LMR voice was being passed. During testing, a VolP telephone connection, as well as Internet and email service, functioned while not significantly degrading the LMR voice communications. This indicates that, in addition to supporting LMR voice communications for rural areas, the satellite connection could serve this dual role, thus helping justify the expense of the service.

Lower bandwidth Satcom systems, such as those tested, are significantly less expensive when compared to traditionally available bandwidth being sold by legacy carriers. Capital outlay for IP Satcom equipment and projected network recurring costs appear to hover around ten to thirty percent of the comparable costs for traditional single channel per carrier (SCPC) Satcom transport, often

referred to as a "dedicated circuit." Cost Comparison example:

Today, in a related NLECTC-NW project, St. Paul Island's intemet access via a shared satellite IP network provider costs $205.00 per month. In contrast, traditional carriers' tariff costs on St. Paul, for equivalent bandwidth of 128 Kbps and 256 Kbps, are $2300.00 and $3250.00, per month, respectively.

Capital costs for dedicated C-Band earth- station equipment are estimated at $80,000, compared to those of shared VSAT IP satellite systems of approximately $15,000.

Based on the results of this evaluation, an agency's requirements, and expected levels of required remote telecommunications services, NLECTC-NW suggests comparing traditional telecommunications carriers' Satcom transport to the lower-cost shared satellite IP providers. Shared systems may well prove adequate at much lower capital and recurring cost. Conscious of the issues raised in this report, many agencies may wish to consider affordable and basic VolP and Satcom capabilities to extend secure LMR communications to areas where none existed before.

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Land Mobile Radio Connectivity via Shared IP Satellite Networks and the Intemet

Objective and Scope Objectives The objectives of this test and evaluation were to - test and evaluate commercially available VolP

gateway equipment, Satcom services, and network element equipment as they pertain to efficient, cost-effective, and secure voice and data communications between urban and rural locations.

Methodology Throughout the four week session, significant setup time was devoted to engineering and determining

which VolP interface products, VPN devices, and Satcom services were capable of configuration to prove viable. The remaining test time focused on collection of adequate quantitative data to analyze. See Figures 1, 2, and 3 for the standard configuration setups. These varied for each of the tested

VolP gateways, VPN devices, and Satcom service systems. Sets of data were collected by making repeatable Delivered Audio Quality (DAQ) measurements between the various VolP gateway and

VPN devices used to pass VolP traffic over each of the three different satellite wide area network

(WAN) circuits. 1 These WAN circuits were dictated by each satellite provider's transport network, as well as their connection to the Intemet.

Project constraints limited the scope of testing of available Commercial Off-The-Shelf (COTS)

products and satellite services. Available project peripherals, time, and funding, limited testing of

equipment and services to those listed below. Satellite systems available for testing were determined by available coverage within Alaska, where the

tests were conducted, and the advice of Microcom Communications, an experienced

satellite engineering firm in Alaska. Compared

to the contiguous U.S., where many additional

satellite systems and services are available,

Alaska has but a few. Results of testing on systems available in Alaska are expected to be

repeatable with on those serving the contiguous states and those serving most areas, globally. Microcom provided a detailed report, Satellites and Satellite IP Service Providers serving Alaska, is included as appendix six of this report.

Subjective Performance Description

Unusable, speech present but unreadable. Understandable with considerable effort.

2 Frequent repetition due to noise / distortion. Speech understandable with slight effort.

3 Occasional repetition required due to noise / distortion, Speech understandable with repetition

3.5 only rarely required. Some noise / distortion.

4 Speech easily understood. Occasional noise / distortion.

4.5 Speech easily understood. Infrequent noise / distortion.

5 Speech easily understood. Table A - Delivered Audio Quality Definitions

Delivered Audio Quality

1

1 DAQ measured by CTA Communications' Radio Coverage Evaluator (RaCE) test equipment and process. DAQ scores conform to TSB-88, a Telecommunications Systems Bulletin published by the Telecommunications Industry Association (TIA). DAQ level 3 is commonly specified as the minimum performance level for public safety systems.

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Land Mobile Radio Connectivity via Shared IP Satellite Networks and die Internet

Each Satcom provider terminated their Satcom circuit at their hub facilities, then routed all VolP

traffic, via the Internet, to our testing session's static IP addresses in Anchorage, Alaska, where

testing was conducted. Refer to Figure 1 for a simplified end-to-end network drawing of the tested configuration.

Figure 1. ~ 22,240 Miles

~ m EarU~

/ Simulated "Remote" I.AN 6t Simulated Remote Satcom AnrJlocogo Toll Futility i Terminal (1 of 3 Tested Shared

: w;U1 VO4P gntoway act.ass Satellite IP Systems) tO "romo~e" tilt radios

' • Tested Wide Area Network Circuits between dotted lines

\

~ N Providers' Network m Anchorage Test

Operations Center In Facility with VolP gateway acz:es| to "lcca~ ',

the lower-48 test ra,,Ios

Simple End-to-End Network Drawing

Figure 2 demonstrates the testing design used to simulate a rural or "bush" radio or VolP gateway

site, and represents a remote site with a local radio-to-radio connection to the mainland LMR system,

Neither a VolP telephone nor a computer connection is shown in this figure, but both could be connected through the multi-port switch.

Figure 2.

TOll 1. Talk Group locked to '~/~.._.~.. "-~' - ''"~-"~1 ~ t ' "~.///ALM R Tr enlr . . . . "Yelp

ALMR Site "A" , ~ ~

Simulated Remote RaCE Detlverer Audio ,~11~ '~e LoOm ~ I of 2 TostOd R~torlFko~ll/ Lines OuoJlW Anofysla T

VPN Network Elements mlthg~

j . 2j?,,- ..= ~ 1 of 3 Te|Wcl Sharacl Satn~,ita ,P Sy,tem, Sa=rn Modem VolP'f~aus'waY Uevcos

AudIo & ALMR Multi-Site Keying Trunked Syltem

~ Transmit and receive baseline audio wave

files here

Simulated Rural LAN and Gateway Site

- 5 -


Figure 3 details the simulated urban radio gateway configuration. As tested, this configuration

allowed a single radio talk group (channel) from rural LRM system to fully integrate or communicate with the mainland LMR system.

F i g u r e 3 .

0 Tas, z Ta,. G~o,p ,o:,ed to -.L.- ~.\~IL~ AU~R ~to'a"

ALMR Site "A" i ~ ~

Audio & ALMR Multi-Site RaCE Dellverec~ Auclio AI~L~ Keying Trunkecl System QueJIly Analysis T o o l ~ ~ g ~b,.~

1 Of 2 Tested Router I Fbl~wall I unel I VPN network eletTimlti

- - - baseline audio wave ADSL Modem with vedfled 240 K ~ | V~lpf~T~vat~ :ev~l files here. up I 1OO0 Kbpl (1 MBplI) down and

mu~tiplo SIollC IP Dddr~SlOl S i m u l a t e d U r b a n L A N a n d G a t e w a y S i t e

Developmental engineering and testing of VolP, Satcom, and VPN equipment took place at the Municipality of Anchorage's Tudor Road microwave site. This facility was graciously offered to NLECTC-NW for project use, and offered a clear view to the sky for satellite shots, as well as available internet service, AC power, and ample space.

Satcom Systems Testing and Evaluation of VolP gateway equipment and VPN devices relied upon data transport via the available Satcom transport systems. Three distinct Satcom networks were tested.

Tested and evaluated Satcom systems: �9 Network Innovation Associates (NIASat| Network.

�9 LBiSat's Shared Hub/Network utilizing iDirect| technology.

�9 Starband's Small Office 484 with Turbomax| System.

Testing of the Starband Satcom network determined it was not compatible with any of our session

equipment iterations. This was an expected outcome, as Starband specifically indicates that its system is not suitable for VolP applications. However, because it was by far the most affordable, NLECTC-NW wished to determine if engineering could prove it viable. The two remaining Satcom networks received extensive operational testing.

Comparison testing of the traditional, stalwart, and much more costly Single Channel per Carrier (SCPC) C-band satellite system with the shared satellite IP networks and their respective Ku-band Very Small Aperture Terminal (VSAT) systems would have presented an additional technical baseline - most likely favoring certain aspects of traditional satellite system transport due to its "dedicated

circuit" qualities. Unfortunately, testing of a traditional C-band circuit was not possible, as the carrier was unable to provide a circuit during the session's testing period.

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Land Mobile Radio Connectivity via Shared IP Salcllite Networks and the lntcrnet

VolP Gateways Three VolP gateways were testing during this evaluation. Each was provided by the manufacturer along with engineering expertise in their operation and configuration.

Tested and evaluated VolP gateway equipment: �9 Raytheon/JPS' ACU-T|

�9 Motorola's MotoBridge|

�9 Twisted Pair's WAVE|

Given the relatively narrow bandwidths of tested Satcom systems, testing and evaluation was

conducted using the VolP gateways' lower bit-rate vocoders. A common low bit-rate vocoder was found between two of the three VolP gateway units - the G.729 codec. The other tested vocoder (codec), the Global System for Mobile Communications (GSM) specification, was the nearest similar bandwidth codec. It was used for comparison purposes with G.729. Specifically, both Twisted Pair

and Motorola's gateways were programmed for G.729 operation, which uses eight Kilobits per Second (Kbps) of bandwidth, while the Raytheon/JPS gateways were programmed for GSM (13 Kbps). 2

Firewall/VPN Devices Utilization of open networks for carrying sensitive information, such as public safety voice communications, mandates security measures are in place. Yet, all security measures have an impact on data throughput and can adversely impact data transmission through narrow bandwidth connections. NLECTC-NW personnel and project engineers wished to evaluate the impact of securing data flowing across the WAN circuit.

A limited number of recommended COTS solutions were tested. Two VPN systems met our requirements and were evaluated. The equipment configurations determined to work with some reliability and quality (without a VPN tunnel), were tested a second and third time - through the different VPN systems. Adjustments to these VPN systems were made to optimize VolP transmissions, where possible.

Tested and evaluated Router/FirewallNPN equipment: �9 Cisco Pix| 506 Firewalls with VPN capability [this series recently unsupported by Cisco in

May, 2005]

�9 End II End Communications TM Satcom optimized VPN devices.

Common Gateway Radio Platform The common VolP interface radio equipment consisted of four Motorola ASTRO TM Digital Spectra| Plus radios. P25 VHF mobiles were loaned by the State of Alaska for testing, and were internally configured to make use of the rear accessory connector that provided push-to-talk keying information,

2 Communications Test Report, page - 29 -

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Land Mobile Radio Connectivity via Shared IP Satellite Networks and tile lnternet

transmit and receive audio. For the duration of the session, two mobile radios were wired to each vendor's VolP interface devices - acting as the wireless access radios in the remote and urban systems. The two remaining radios acted as the subscribers communicating between one another across the Satcom/Internet link.

Evaluation Audio analysis was performed by CTA Communications using their Radio Coverage Evaluator (RACE) tool. Delivered Audio Quality (DAQ) tests were conducted while accessing the ALMR's P25 common air interface. Through the interfacing of end subscribers' radios, CTA utilized powerful laptop computers which transmitted and received baseline audio wave files to and from one another. CTA summarized recorded session results, and presented representative audio and visual samples of collected measurements. From this data, CTA was able to present findings regarding P25 conventional, P25 trunking, and Satcom-linked P25 trunked system subscribers' transmission delays, voice quality, as well as audio waveform analysis and general reliability.

Microcom Communications facilitated the session evaluation as Satcom subject matter experts, installing and coordinating satellite communications with Satcom vendors, as well as integrating the various vendors' VolP interface and VPN and firewall products with the separate LANs.

Developmental Engineering and Other Issues Encountered The first three weeks of testing identified a common problem observed with each vendor's VolP transmissions on the available Satcom systems - the loss of the first 300 milliseconds to 1 second of message audio. This early audio data loss was diagnosed and corrected late in testing by implementing a small eight or twelve Kbps Committed Information Rate (CIR) to our VSAT terminal connections. In effect, this served to keep our satellite session "alive" and avoided the required setup time normally experienced in data transfer on shared IP satellite connections. The addition of a small CIR rate to our Satcom services virtually eliminated the initial remote site transmitted audio loss. Any initial early loss identified after CIR implementation was determined to be inconsequential to voice quality.

Radio frequency interference attributed to the four VHF band mobile radios and associated antennas operating together in a confined, almost near-field, environment initially hampered testing. Mobile receiver desensitization and intermodution interference were subsequently minimized by differing antenna polarizations, maximizing antenna vertical and horizontal placement distances, and taking advantage of metal building shielding techniques; to include the insertion of coaxial line attenuators. Post session data analysis determined only one specific local trunking channel (of many available at the sites) was interfered with, so the data collected from our random use of that channel was subsequently removed from CTA Communications' final analysis.

General Results The session's most revealing and helpful technical solution was the implementation of the small Committed Information Rate (CIR) of eight or twelve Kbps on the Satcom networks. This CIR feature virtually eliminated any initial transmitted VoIP audio loss, and appears to be an essential feature for

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Land Mobile Radio Connectivity via Shared IP Satellite Networks and the lntcrnet

future two-way radio transmissions transported via shared satellite IP systems. In essence, the CIR ensured "burstable" bandwidth, such as the immediate need for bandwidth generated by a two-way radio. It should be noted, a satellite connection configured with a CIR appears to add additional cost, as it may likely be considered a premium feature on a shared satellite IP system.

Each of the VolP gateway devices provided radio linking capability. However, each gateway product is unique and presents characteristics suitable for different application suites. With few exceptions, VolP gateway devices were not a limiting factor in this test and evaluation project.

Satcom system transport capabilities are important when considering VolP data passage. Specifically, viable Satcom systems carrying radio related VolP traffic must first be designed to efficiently carry general VolP traffic. For example, Starband, a consumer-grade shared satellite IP network, was not capable of passing session voice traffic of any kind. While this network clearly stated that it would not support normal VolP traffic, its potential was tested because of its low cost and wide-spread use throughout Alaska.

Satcom bandwidth evaluations revealed a narrower uplink width of 64 Kbps passed the tested VolP radio traffic successfully. With at least one VolP device, the Motorola MotoBridge| larger bandwidth requirements like 128 Kbps or 256 Kbps (or higher) may be necessary in order to establish the multiple session initiation protocol (SIP) links for this system's configuration. In a future shared, multiple site, satellite network design, these identified narrow bandwidth capabilities may offer efficiencies and management options as a limited bandwidth Satcom network grows with users. These narrower bandwidth requirements may lower the operating costs of any future shared satellite IP network system design, and may place a shared network design within the financial reach of more rural public safety organizations.

Evaluation of VPN devices readily demonstrated differences between devices designed for terrestrial networks and those optimized for transport over high latency and jitter prone Satcom networks. Through its transparency, the End II End Communications TM Satcom optimized VPN solution proved itself in testing, while an older Cisco Pix| 506 FirewallNPN system did not pass VolP traffic over the Satcom networks tested, in spite of extensive engineering efforts.

Communications Reliability Consumers of terrestrial based LMR systems normally require a minimum reliability guarantee, or certification from their vendors, that the system will reliably pass communications to a certain percentage, sometimes as high as 99.999% or 5-9s reliability. At least one vendor currently will not certify their VolP product for rigorous public safety use, due to the less-than-perfect communications via satellite transport mechanisms. The manufacturer indicated its VolP system's capability over these shared satellite Internet Protocol (IP) networks should only be used for "administrative use." Other Voice over Internet Protocol (VolP) interface vendors have not made this statement, and do indicate their solutions can be relied upon for public safety purposes.

Agencies should consider and weigh their requirement for communications reliability against their need to establish basic communications with remote locations where none ever existed. This has sometimes been referred to as Better than Nothing (BTN) technology.

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Land Mobile Radio Conncctivil.y via Shared IP Satc)litc Nctworks and I.hc Inl.crne!

Testing demonstrated that with proper configuration and provisioning, and robust ground based networks, barring a failure of critical equipment such as earth stations or networking equipment, systems should prove reliable.

Security Considerations The tested configurations will meet the security requirements of the majority local and State public safety agencies. Each configuration ensured that all wireless and wire line transmissions leaving physically secure sites were encrypted with high strength measures - 128-bit or higher Advanced Encryption Standard (AES) on P25 common air interface (wireless) transmissions, and end-to-end 256-bit AES via Satcom and Internet transport. Federal security requirements, those that govern secure military systems, for example, are more stringent; tested configurations will not meet their requirements without the addition of bulk encryption devices between radio systems and the VolP gateways.

As tested, and mandated by limitations of the VolP gateways evaluated, the network configurations discussed in this report break out encoded transmissions at two intermediate points - each gateway location. Most public safety agencies will contain their radio and network communications equipment within a secure setting, such as a police station or other government facility. The fact that the tested configurations have points at which the network is subject to unencrypted data transmission is likely to be viewed as a manageable risk, when weighed against the cost of bulk encryption devices.

Federally secure systems require end-to-end encryption - without cipher coded data being broken down into uuencoded or "plain text" at any point along the transmission path, or between communications endpoints. Bulk encryption devices are being used to provide this additional level of security on secure systems relied upon by military and federal enforcement agencies. Advances in equipment and adoption of in interim Inter Sub-System Interface (ISSI) Standard for P-25 systems may well provide a solution to this issue in the near future.

Conclusion Test results indicate users of rural analog and digital land mobile radio systems can be cost- effectively and securely connected to subscribers on traditional LMR networks. Today's COTS VoIP interface products, Satcom services, and public safety grade network security products can allow for a wealth of voice and data traffic to be passed efficiently, securely, and cost effectively to most remote places within North America, and, potentially, globally. In effect, communications professionals should no longer consider their systems in remote locations isolated due to the lack of Public Switched Telephone Network (PSTN) or microwave systems to urban or regional systems. The potential exists today, with even greater future potential, to create effective satellite-linked voice and data IP networks.

Summarized session findings: �9 Substantial planning, engineering, testing, and troubleshooting are required to implement a

reliable, stable, and economical Satcom connectivity solution.

- 1 0 -

Land Mobilc Radio Conncctivity via Shared IP Satcllitc Nctworks and thc Intcrnet

�9 Capable Satcom IP services are available for voice and data transmissions in Alaska. 3

�9 The public Internet can be used to pass secure and practical VolP and data traffic, and can be utilized as part of a secure WAN solution linking widely disparate locations.

�9 VPN solutions exist today that can secure public safety networks utilizing Satcom and the Internet.

�9 Voice land mobile radio traffic over Satcom can take place with little voice quality degradation.

Areas Requiring Further Testing & Evaluation: Based on the positive results of this testing project, it is hoped that public safety practitioners find value, direction, and purpose in NLECTC-NW's project.

The very nature of IP lends itself well to the passage of a host of telecommunications services. IP voice and data over existing and upcoming satellite providers' communications networks offers communications capabilities seldom seen in areas were no PSTN connectivity exists, or where it is disabled or destroyed - such as remote parts of Alaska or in hard-hit, inhospitable, disaster areas like the Gulf Coast region after Hurricane Katrina.

Recent developments regarding the implementation of the P25 Inter Sub-System Interface (ISSI) standard, as well as our positive findings regarding two-way radio VolP via Satcom and the Internet, offer a means for public safety and communications industry managers and engineers to review, compare, test, and evaluate how these IP technologies may facilitate effective VolP and related IP data communications. NLECTC-NW would like to support further investigations regarding this unique and potentially far-reaching communication transport capability.

This project only scratched the surface regarding effective and secure IP over satellite communications systems. Project constraints limited the scope of engineering, testing, and evaluation that could be conducted. The project's narrow focus did allow involved parties to conduct

a certain amount of developmental engineering - leading to some successes. Newer satellite IP providers' networks and packet based systems should be evaluated for their support of VolP radio traffic. Future testing with alternative Satcom networks and interface devices will expand our

An actual appl icat ion of this technology:

Alaska Land Mobile Radio project managers, based on the preliminary results of the NLECTC- NW test, have begun discussions with the US Air Force unit managing the Early Warning radar sites along the Aleutian Chain, and the northern and western coasts of Alaska. These sites could provide substantially enhanced coverage for the ALMR network in these areas, extending coverage to small communities otherwise unable to afford to participate in the new statewide system.

Site surveys and system designs for these sites are currently underway, as this report is completed.

3 Appendix 6, Satellites and Satellite IP Service Providers Serving Alaska.

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Land Mobile Radio Connectivity via Shared IP Satellilc Nctworks and the lnternet

knowledge and experience.

Areas that require further testing and evaluation include:

�9 Evaluation of packet-based satellite networks for support of VolP radio transmissions

�9 Evaluation of Satcom networks supporting the contiguous US for suitability in supporting VolP radio networks

�9 The passage of ISSl and related P25 IP transport standards via geosynchronous satellite systems.

�9 Subscriber encrypted digital transmissions via Satcom without dropping to base-band audio within the circuit (related to ISSl passage and new system and equipment deployments).

- 1 2 -



By

i r Micro, corn

COMMUNICATIONS

-13-



INTRODUCTION: This report has been prepared by CTA Communications with a significant contribution from Microcom. The testing was conducted jointly by CTA and Microcom personnel in conjunction with representatives of the equipment suppliers. All of the satellite system and internet connectivity was arranged for and/or provided by Microcom. Microcom remained in charge of the frequent adjustments that were needed to addressing and IP equipment configuration throughout the test process. CTA provided the test equipment utilized for the objective evaluation of the audio quality delivered by the radios at each end of the circuits. CTA also handled the radio interface to the test equipment and had the overall responsibility for the collection and evaluation of the test results.

Questions concerning these areas of responsibility should be addressed to:

Tom Brady Microcom 1143 East 70 m Ave Anchorage, AK 99518 907-264-0016

tom~,sateo.com

John Wachter CTA Communications 20715 Timberlake Road Lynchburg, VA 24502 434-239-9200

jwachter~,ctacommunications.com

This test program was conducted under the direction of the National Law Enforcement and Corrections Technology Center- Northwest (NLECTC-NW) and Chenega Technology Services Corporation (CTSC). For general questions contact:

Steven Gehring NLECTC-NW Project Manager 3000 "C" Street, Suite 304 Anchorage, AK 99503-3975 907-355-2370 Steve.qehrinq~ctsc.net

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EXECUTIVE SUMMARY: The various users of the Alaska Land Mobile Radio System (ALMR) have identified the need to connect rural portions of public safety trunked radio networks to major dispatch centers in the Wasilla and Fairbanks areas. As most long haul telecommunications services in rural Alaska are provided over some type of satellite network, the ALMR system manager needed information on the feasibility and practicality of linking distant land mobile radio (LMR) systems via different types of satellite networks. The purpose of the test program conducted by the Northwest Law Enforcement and

Technology Center was to determine if LMR equipment that cannot practically be connected over traditional landline means, can be linked in a reliable and useful manner over satellite.

Testing was performed using the existing Alaska Land Mobile Radio System as the test bed. During the project, various ALMR radios were interconnected using several satellite link configurations. Analog audio from the trunked radio network was converted to digital using standard vocoders used for VOIP and then transmitted over the public internet to satellite service uplink center. From that point it was sent via the satellite network to a remote VSAT and was converted back to analog audio for handoff to the trunked radio network. Several predefined vendors of Radio Internet Protocol (IP)

gateways, satellite networks, and security enhancing Virtual Private Networks (VPNs) were tested in an attempt to determine which configurations should be pursued further.

During the course of the project, several areas of system link performance were investigated. These include link transmission delays, voice quality, and general reliability. Link delays were determined for the LMR and link portions of the system. Notes on reliability and ease of equipment setup are also included in this report.

CTA's Radio Coverage Evaluator (RACE) tool set was used for determination of voice quality. RaCE evaluates human speech in terms of Delivered Audio Quality (DAQ) on a standard scale from 1 to 5.

Summary Results: �9 With training, it is practical to carry on a conversation over a satellite-linked LMR radio

system. Total call delay is in the neighborhood of 2.5 to 3 seconds. The IP/satellite link contributes roughly 2 seconds. The LMR equipment adds another 0.5 to 1 second depending on the configuration.

�9 Despite the complex linking path, voice quality is generally very good, measured in the DAQ 4 range.

�9 VPN equipment is highly recommended for system security, ease of system setup, and for improved system reliability.

�9 Satellite IP services that provide sufficient quality of service to support Voice over Internet Protocol (VolP) telephony to the PSTN, can support trunked radio gateways. An initial bandwidth allocation mechanism, such as a Committed Information Rate (CIR) is required to avoid clipped speech.

�9 VPN solutions do exist that can be employed over public shared satellite IP networks to provide an end to end security solution without degrading the satellite network performance or voice quality. However, they must be specifically tailored for use on satellite networks since the high latency of these networks greatly limits most VPN performance.

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�9 The minimum bandwidth needed to support a radio channel with or without a VPN tunnel over a shared satellite IP network is 64 Kbps (assuming use of a CIR).

�9 The public internet can practically serve as part of the network to provide a connection between two trunked radio networks without affecting network performance or voice quality.

PURPOSE AND DESCRIPTION OF THE TEST: This report describes the test results of Voice over Intemet Protocol (VolP) transported over satellite communications links. The tests performed are those called for under Phase 2, Functional Testing in the test plan "Draft Test Plan for TCP/IP Transport through Satcom Facilities", Revision 3.

The primary objective was to functionally test and evaluate commercially available Satcom providers and VolP interface devices in an operational environment. Testing involved several vendors of VolP gateway equipment, satellite service providers, and the public Internet to connect geographically separated radio systems allowing distant users to communicate with each other.

While the ultimate goal is to link distant radio sites via satellite, two local sites on the Alaska Land Mobile Radio (ALMR) System are used in this test exercise to facilitate easy access to both ends of the test setup. System diagrams illustrating eight test configurations are shown in Appendix 1.

A second objective was to explore the possible enhancements available to obtain the most reliable and stable operation of any link established. A third objective was to explore the possibility of operating through a Virtual Private Network (VPN) in order to provide additional security as well as a potentially more robust system.

TES T METHODS: Each vendor of VolP gateway equipment was encouraged to carefully optimize their equipment for the highest quality voice reproduction they could achieve over the available links. Assistance was provided by CTA and Microcom personnel whenever needed in setting levels and establishing Internet Protocol (IP) connections. The link consisting of the VolP gateways, the satellite hop, the internet and the two radio sites were then tested to determine the Delivered Audio Quality (DAQ) as measured by the RaCE (Radio Coverage Evaluator) test equipment supplied by CTA Communications. The audio testing was accomplished by passing a known sample of speech in one direction through all of the series connected equipment and then evaluating the arriving signal at the destination to determine what changes in the voice quality had occurred. The system would then automatically test the return path in the same manner. The normal testing method was to initiate the RaCE mobile audio sequence into the satellite terminal end of the network and evaluate that call as it arrived via the internet end of the network using the RaCE stationary equipment. The return path started with the RaCE stationary unit connected to the internet end of the network and terminated at the mobile end connected to the satellite terminal where the second audio analysis was accomplished. The preliminary test results were displayed on the test computers for all participants to view. An additional test consisted of timing measurements of all the principle events occurring during the testing. The 8 tracks of data measured were the Push to Talk, Transmit Power, Transmit Audio Envelope and the Receive Audio Envelope as seen at the test radios at each end of the paths. The timing measurements were accomplished under multiple modes of system operation in order to see the effect of changing from one mode to another. A good knowledge of the timing results will assist users in understanding the special requirements for operating their systems over satellite links.

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TES T RESUL TS: A very large number of results have been recorded and a few significant findings are displayed here. The WlNDAQ Browser Software is included on the accompanying disk that will allow the exploration of the timing results.

The latest version of that software is available from http://www.dataq.com on the internet. Waveforms of audio files (.wav files) can be viewed using a freeware program available from HTTP:/NWVW.AUDACiTY.SOURCEFORGE.NET on the internet.

It should be noted that the entire team involved in this testing felt a great deal of disappointment in the observed results during the first phases of the test program. The results always seemed to fall short of what is required for reliable communications.

The calls initiated on the satellite end of the links tested were plagued by a persistent loss of the first portion of the message which included a necessary preamble that triggers the recording and analysis of the audio. Radio Frequency Interference (RFI) was a constant issue in the internet terminal to satellite terminal direction. No amount of repositioning antennas, adding attenuators or other means at our disposal completely eliminated the issue. Eventually it was determined that the RFI was associated with only one particular channel assignment. The effects at this point became easily recognizable and the offending results were removed in the post processing. There are notes in each of the resultant spreadsheets where this was necessary.

Towards the end of the scheduled testing, a solution was discovered that alleviated virtually the entire

data loss problem at the start of the test messages. This solution which called for the satellite service provider to include a Committed Information Rate (CIR) of 8 KB allowed the radio originated

messages to proceed without the necessity of negotiating a changed data rate in the satellite system. This solution is responsible, more than any other factor, for considering the test program a success.

During the testing we accumulated over 2.3 GB of data in more than 29,000 files. Many of these are only appropriate for the internal needs of the RaCE analysis software. A large number were generated during the setup and alignment phases of the project and for that reason are not appropriate for inclusion here. A CD is included with the report containing files that are appropriate for anyone wishing to delve further into the results. Included also on the CD, are page-size views of the timing records that are presented in the next section.

TIMING EVENTS In this section we present the timing involved in the following types of calls:

�9 Direct radio to radio call in digital mode

�9 Radio to radio call in digital mode via a trunking site

�9 Digital call via Satcom link

The timing examples presented are a representative sample of the measurements collected, and serve to familiarize the reader with the mechanics of link operation. Building on this background, we then move into discussion on the performance characteristics of the various vendor and equipment configurations.

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T I M I N G E V E N T S F O R A D I R E C T R A D I O T O R A D I O C A L L IN D I G I T A L

M O D E :

The direct radio to radio case allows us to observe the timing characteristics of communication between two digital radios. There is no satellite link or radio site infrastructure between the two radios. Mobile refers to radio #1 and stationary refers to radio #2.

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In Figure 1, the cursor is located at the start of the PTT operation. For our timing analysis, this is considered as TIME 0 (143.1705 seconds into the record).

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In Figure 2, mobile transmit is shown occurring 143.2065 seconds into the record. This indicates that the mobile synthesizer and power amplifier required approximately 36 milliseconds to respond.

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In Figure 3, RF presence and valid digital modulation have been detected. The receiving radio has responded by connecting its audio circuitry to the speaker and all of the audio circuits have not quite settled into equilibrium yet. The short pulse seen in trace 8 is usually not audible to the user.

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In Figure 4, the cursor is positioned at 143.6704 seconds into the record. RaCE waits until this point in time before starting to send audio. A deliberate delay of approximately 500 milliseconds is provided to insure that all audio circuits have settled into equilibrium. This preamble is detected by the destination radio as the trigger point for starting the recording of the receive audio to be analyzed.

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In Figure 5, the cursor now positioned at 143.8644 seconds, marks the point of valid receive audio. It took approximately 194 milliseconds for the transmitting radio to process the first packet of audio into a digital signal and for the receiving radio to decode it.

This value of 194 milliseconds is the typical latency contribution of a pair of radios within a digital system�9 This short latency period is not noticed by users under normal radio use conditions.

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TIMING EVENTS FOR A RADIO TO RADIO CALL IN DIGITAL MODE VIA A TRUNKING SITE:

Processing a call through a trunking site and its associated control components always adds processing time. A study of the timing compared to that of the direct radio to radio call will provide a good approximation of the overhead imposed by the system. As with the direct radio to radio call, the delays and latency indicated are not normally noticed by, or of concern, to the users of the system. In no way is this information meant to be used to compare one trunking system to another; it is

presented here as background for understanding trunked site timing before adding the satellite link into the equation.

It should be noted that there are some significant differences in the timing events when you compare a direct call to a trunking call. in the trunked scenario, there is an initial call made on the control channel followed by a change to an assigned working channel as well as the system storage and forwarding of the voice packets.

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Figure 6 1 SITE PTT START.GIF

In Figure 6 the cursor is shown at

the start of the mobile radio PTT operation. The time within the record for this event is 264.4213 seconds but is still considered as TIME 0 for this set of sequenced operations.

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In Figure 7, the cursor is now located at the record time of 264.5013 seconds which is approximately 80 milliseconds after the beginning of the PTT. This mobile transmission lasts about 40 milliseconds and is aligned in time with designated slots assigned by the radio site control channel transmitter. During this period the calling radio identifies itself and requests the type of call to be made. During

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In Figure 8, the transmitting mobile has begun its second transmission at the record time of 264.6773 seconds or approximately 256 milliseconds after the PTT start but is now

operating on the working channel. Within a few milliseconds, the transmitting radio produces a "Grant Tone Sequence" in the local speaker indicating to the operator that it is now OK to begin talking. The local microphone is connected to the transmitter

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Figure 9 1 SITE PREAMBLE TX

START.GIF

In Figure 9, the cursor at the record time of 265.1332 seconds marks the point where RaCE begins the transmission of the preamble. This point which is controlled by RaCE is well after the time when the audio circuits are energized and expected to

carry normal user audio. At this point we are approximately 712 milliseconds into the call as referenced from the PTT.

Figure 10 1 SITE PREAMBLE RX START.GIF

In Figure 10, the cursor is at a record time of 265.4892 seconds showing where the stationary radio has started to send the preamble audio to the speaker. Approximately 356 milliseconds have elapsed since audio was applied to the sending radio. This time represents the latency between two radios in a single

site trunking system. Latency was 194 milliseconds between two radios operating directly, so the difference of 162 milliseconds is the overhead imposed by the

trunking system. These times should be considered approximate as they would require a large number of measurements to determine an accurate average.

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TIMING EVENTS FOR A DIGITAL CALL VIA SATCOM LINK:

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CALL.GIF

Figure 11 illustrates the timing sequence of a digital call between two radios, one on each of the trunked sites linked via Satcom. In this case, the test call originated on the satellite terminal end of the link and was received at the internet terminal end. The timing scale is 0.5 seconds per horizontal division.

Trace 1 shows the PTT signal of the originating radio. Trace 2 shows the actual transmit times for the originating radio including the short control channel burst. Trace 3 is the compressed envelope of the audio applied to the originating radio. Note the start point of the preamble, the first activity on trace 3. Trace 4 shows the

grant tone on the speaker line of the originating radio. Trace 8 is the envelope of the received audio

at the destination radio located on the internet terminal end of the link. Note that the preamble start time is about 5.6 divisions after the start in trace 3 representing a total link latency of 2.8 seconds in this direction. Subtracting the trunking latency for two sites (.356 X 2 = .712 seconds), the actual IP/satellite link latency is 2.088 seconds (2.8 - .712 = 2.088). This latency time includes not only the satellite transit time but also delays in all of the routers, bridges, IP gateways and VPNs in the entire route traversed by the test message.

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INTERNET TERMINAL ORIGINATED CALL.GIF

Figure 12 illustrates the call sequence in the opposite direction. This test call originated on the intemet terminal (stationary radio) end of the link and was received at the satellite terminal end (mobile radio).

The originating radio PTT and actual transmit times are shown in traces 5 and 6. Trace 7 shows


the originating compressed audio envelope. Trace 8 is the originating radio grant tone burst which is not a significant part of this measurement. Comparing events on trace 7 to events on trace 4 shows total system latency in this direction of 2.525 seconds. Subtracting the latency of the two trunking systems, 0.712 seconds, this equates to an IP/satellite link latency of 1.813 seconds. In practice, considerable call timing variation due to variable routing delays in the internet portion of this call path could be expected.

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A UDIO PA TTERN ANAL YSIS This section describes the audio patterns used during testing.

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Figure 13 TX AUDIO WAVEFORM.GIF

In Figure 13, the waveform of the transmitting radio test audio is shown with a time scale of 0.5 seconds per division. This particular waveform portrays a message recorded with a male voice. There are four major elements to the test message. The first 500 ms is a burst of white noise that has been filtered to remain within the 300 Hz to 3000 Hz range. This is known as the Preamble and is used by RaCE to reliably detect the start of the message. It has been found that pure tones do not pass well through many types of vocoders but the noise sequence shown seems to be compatible with vocoders tested to date. The second element is a 750 ms period of silence. RaCE begins recording the receive audio during the silence period. The third element is the message body containing the actual human voice test phrase. Recording time is set for one second longer than the message body. Recording ends during the final message element, a 1.25 second silence period. This final period of silence helps insure the final squelch burst is not captured in the recording, adding unwanted noise degradation.

If at least 250 milliseconds of continuous preamble is detected and there is no preceding long burst of noise, RaCE will start the recording in the first silent period and end within the final silent period. It is not necessary to have a precise start trigger point because the algorithm used for determining the quality of the received voice is capable of shifting the waveform in time to align it for comparison. The test phrase utilized for this testing was: "This is a test of the Alaska Digital Radio System, one, two, three, four, five, alpha, bravo, charlie, delta, echo." This test phrase does not present all of the possible English language sound combinations but it does contain a sufficient variety to properly test a vocoder based system. The overall test call length using this test phrase is about 10.3 seconds.

The following three figures show some typical audio waveforms as received by the RaCE equipment. Two of the figures represent the audio that should be expected with a properly configured system, and the third figure shows an example of the audio loss that occurs in the presence of heavy interference. Audio files resulting from this heavy interference, which was due to the close proximity

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of too many radio transmitters along with a non optimum system channel assignment, are not considered to be a valid test result and are not included in the voice quality analysis.

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Figure 14 shows audio seen by the stationary RaCE unit during a call from the satellite terminal end to the internet terminal end.

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Figure 15 shows audio seen by the mobile RaCE unit during a call from the internet terminal end to the satellite terminal end of the link.

Both Figures 14 and 15 show some modification to the audio compared to the signal that was sent in Figure 13. The noise level has also increased by a significant amount. Some of the changes that are visually apparent are due to the passage of the audio through 3 sets of vocoders, one in each pair of radios, and one in the pair of VolP gateways. Despite this, the recovered audio quality was still very useable. In Figure 14 there is one apparent loss of a speech packet at approximately 0.75 seconds into the recording. In Figure 15 there is an apparent loss of one speech packet at approximately 1.6 seconds into the recording.

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Figure 16 TYPICAL INTERFERENCE LIMITED AUDIO.GIF

Figure 16 shows a significant loss of speech packets as well as the introduction of a great deal of noise. This was not caused by the IP/satellite link, the path under scrutiny for this test. Instead, the loss was caused by localized RF conditions at the test site.

Results such as this, which are due to conditions outside the control of the test conductors as well as outside the intended analysis area, are being eliminated from the data used to produce the final result tables.

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TABULAR RESULTS AND COMMENTS: Link testing results are presented using various combinations of IP gateway and satellite provider as called for in the test plan. Each of the summary tables in this section contains information that was extracted from Microsoft Excel files produced during testing. DAQ scores are averages representing the received message analysis, These files are included on the data CD that accompanies this report.

At the time of the tests we noted the following information related to the vocoders used in the gateway equipment:

SUPPLIER TYPE DATA RATE Twisted Pair G729 8K JPS GSM 13K Motorola G729 8K

T E S T S E R I A L N O . 2 0 0 5 0 9 1 4 B

IP GATEWAY TWISTED PAIR SATELLITE LBI VOICE TEST MALE DATA RATE 128K 8K CIR ENABLED NO VPN NO OTHER PRE LOADING MOBILE DAQ AT INTERNET END

NONE 3.133

STATIONARY DAQ AT 4.793 SATELLITE END

NO RECOMMENDED CONFIGURATION?

In test 20050914B, there were a high number of timeouts on the satellite to internet path due to the loss of the preamble. The normal configuration for testing was to have the mobile connected to the satellite end of the circuit. In this test the mobile was connected to the internet end and the stationary was connected to the satellite end. The later tests are in the

normal configuration. Even though the total configuration is not recommended, the Twisted Pair equipment showed a great deal of promise and appears to be fully capable of meeting the system needs for an IP gateway. The addition

of an appropriately sized CIR should make this an attractive combination. A failure in one of the supplied cards caused a substantial loss in the measured speech quality which was evident in both

listening tests as well as the RaCE Mobile DAQ scores. We recommend further consideration of the Twisted Pair product.

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T E S T S E R I A L NO. 20050914C IP GATEWAY TWISTED PAIR SATELLITE STARBAND VOICE TEST MALE DATA RATE 128K 8K CIR ENABLED NO VPN NO OTHER PRE LOADING NONE MOBILE DAQ AT BELOW 1.1 SATELLITE END STATIONARY DAQ AT NONE INTERNET END RECOMMENDED NO CONFIGURATION?

T E S T S E R I A L NO. 2 0 0 5 0 9 1 6 A IP GATEWAY JPS SATELLITE LBI VOICE TEST MALE DATA RATE 128K 8K CIR ENABLED NO VPN NONE OTHER PRE LOADING NONE MOBILE DAQ AT 4.719 SATELLITE END STATIONARY DAQ AT 3.348 INTERNET END RECOMMENDED NO CONFIGURATION?

T E S T S E R I A L NO. 2 0 0 5 0 9 1 9 A IP GATEWAY JPS SATELLITE LBI VOICE TEST MALE DATA RATE 128K 8K CIR ENABLED NO VPN NONE OTHER PRE LOADING IP PHONE MOBILE DAQ AT 4.533 SATELLITE END STATIONARY DAQ AT 4.212 INTERNET END RECOMMENDED PARTIAL CONFIGURATION? SEE NOTES

Test 20050914C used the Starband satellite link. The Starband link is not designed or marketed for use with voice over internet protocol. This fact was verified in the test trials, and as a result, Starband should not be considered as a viable satellite link provider for VOIP at this time. A

reconfiguration of their internal protocols could modify their capability to carry VOIP in the future.

In test 20050916A, there were numerous

timeouts in the satellite to internet direction due to the loss of the preamble. Some messages were almost entirely lost due to data allocation issues on the satellite link. The actual DAQ

values are probably worse than indicated due to the automatic rejection of non correlated results in the analysis software. More clues may be gained by reviewing the timing record to see the effect of the lost preamble in messages as well as the general loss of data.

Greatly improved results were seen in test 20050919A compared to earlier tests. The improvement was due to artificially adding loading to the satellite circuit by operating an IP phone on the same circuit. This seems to indicate that this type of satellite circuit could be added directly to a satellite termination point that is already in continuous use providing other traffic on the same dedicated path.

If continuous traffic is not present, it may still be necessary to arrange for an appropriate CIR. Note that this configuration requires the addition

of some type of circuit pre-loading such as a CIR. IP phone loading is not a practical solution.

- 30 -

TEST SERIAL NO. 20050919B IP GATEWAY JPS SATELLITE NIASAT VOICE TEST MALE DATA RATE 128K 8K CIR ENABLED NO VPN NONE OTHER PRE LOADING NONE MOBILE DAQ AT 3.604 SATELLITE END STATIONARY DAQ AT 3.288 INTERNET END RECOMMENDED NO CONFIGURATION?

TEST SERIAL NO. 20050919C IP GATEWAY JPS SATELLITE LBI VOICE TEST MALE DATA RATE 128K 8K CIR ENABLED NO VPN NONE OTHER PRE LOADING IP PHONE MOBILE DAQ AT 4.459 SATELLITE END STATIONARY DAQ AT 4.585 INTERNET END RECOMMENDED PARTIAL CONFIGURATION? SEE NOTES

TEST SERIAL NO. 20050919D IP GATEWAY MOTOROLA SATELLITE LBI VOICE TEST MALE DATA RATE 128K 8K CIR ENABLED NO VPN NONE OTHER PRE LOADING IP PHONE MOBILE DAQ AT 4.042 SATELLITE END STATIONARY DAQ AT 3.746 INTERNET END RECOMMENDED PARTIAL CONFIGURATION? SEE NOTES

The configuration shown in test 20050919B would probably work well if pre-loading or a CIR

was utilized. There were two timeouts in each direction resulting from no useable RX data.

Many aberrations are visible in the timing chart associated with this test. See the *.WDQ file in

the 20050919B subdirectory on the accompanying disk.

The configuration shown in test 20050919C is judged as partial because a CIR is probably the

best permanent solution to make this a fully recommended solution. This combination worked with excellent results.

The configuration shown in test 20050919D is judged as partial because a CIR is probably the best permanent solution to make this a fully recommended solution. This combination worked with excellent results.

-31 -

TEST S E R I A L NO. 2 0 0 5 0 9 2 0 A IP GATEWAY JPS SATELLITE LBI VOICE TEST MALE DATA RATE 128K 8K CIR ENABLED YES VPN NONE OTHER PRE LOADING NONE MOBILE DAQ AT 3.800 SATELLITE END STATIONARY DAQ AT 4.203 INTERNET END RECOMMENDED YES CONFIGURATION?

TEST S E R I A L NO. 20050920B IP GATEWAY JPS SATELLITE LBI VOICE TEST MALE DATA RATE 128K 8K CIR ENABLED YES VPN END TO END OTHER PRE LOADING NONE MOBILE DAQ AT 4.253 SATELLITE END STATIONARY DAQ AT 4.387 INTERNET END RECOMMENDED YES CONFIGURATION?

T E S T S E R I A L NO. 20050920C IP GATEWAY MOTOROLA SATELLITE LBI VOICE TEST MALE DATA RATE 128K 8K CIR ENABLED YES VPN END TO END OTHER PRE LOADING NONE MOBILE DAQ AT 3.214 SATELLITE END STATIONARY DAQ AT 3.778 INTERNET END RECOMMENDED YES CONFIGURATION?

In test 20050920A, the combination produced excellent results but did not include a VPN that could enhance security and make addressing easier.

This combination in test 20050920B brings together all of the most desirable components for an operational system with the degree of security required for Public Safety.

This combination in test 20050920C brings together all of the most desirable components for an operational system with the degree of security

required for Public Safety. The DAQ scores were lower than some of the similar tests. This is believed to have been caused by the use of experimental software in the Motorola equipment that was not used during the other tests.

- 32 -

T E S T S E R I A L NO. 2 0 0 5 0 9 2 1 A IP GATEWAY MOTOROLA SATELLITE LBI VOICE TEST MALE DATA RATE 64K 8K CIR ENABLED YES VPN NONE OTHER PRE LOADING NONE MOBILE DAQ AT 4.15 SATELLITE END STATIONARY DAQ AT 4.285 INTERNET END RECOMMENDED YES CONFIGURATION? WITH LIMITS

T E S T S E R I A L NO. 2 0 0 5 0 9 2 1 B IP GATEWAY JPS SATELLITE LBI VOICE TEST MALE DATA RATE 64K 8K CIR ENABLED YES VPN END TO END OTHER PRE LOADING NONE MOBILE DAQ AT 4.425 SATELLITE END STATIONARY DAQ AT 4.485 INTERNET END RECOMMENDED YES CONFIGURATION?

In test 20050921A, the combination worked well

with the benefit of reduced bandwidth on the satellite circuit. It did not include the VPN which could have been added without any penalty to the operation. The VPN is highly recommended but missing in this test. There may be persistent bit errors at this data rate. Accordingly, this solution is judged as a limited solution.

The combination in test 20050921B worked well with the benefit of reduced bandwidth on the satellite circuit. It did include the VPN which

seemed to impose no penalty on the operation.

- 33 -

OTHER POSSIBLE VARIATIONS IN THE INTERCONNECTION OF RADIO SYSTEMS: This test was accomplished by simulating two separate trunking systems of the same manufacturer. The IP/satellite link should be able to accommodate different combinations of systems such as the following.

�9 Motorola Trunking to Other Manufacturers Trunking

�9 Motorola Trunking to a Conventional Base Station

�9 Other Manufacturers Trunking to a Conventional Base Station

�9 Conventional Base Station to a remotely located Conventional Base Station

�9 Any type Conventional or Trunking System to a remote Phone Patch

S YS TEM IMPLEMENTATION RECOMMENDATIONS: There were a number of difficulties noted during the testing. It is recommended that systems such as this be installed only by properly trained and skilled personnel. Specifically, the knowledge requirements include an exceptional knowledge of IP addressing, satellite antenna installation, audio level setting in Digital Land Mobile Radio Systems as well as good theoretical knowledge and practical experience in Land Mobile Radio. It is also recommend that all systems planned for installation in remote locations be pre-installed or staged at a prime location where all the needed technical expertise is located. The knowledge that a system worked once is highly valuable when troubleshooting in the field.

VENDOR SPECIFIC COMMENTS:

Satellite Vendors LBiSat. Support by the LBISat Network Operations Center was excellent throughout the test. Their systems engineers were very quick to propose the 8 Kbps CIR as a means to correct the initial loss of audio due to delay In bandwidth allocation.

NIASat. Support from the NIASat Network Operations Center was excellent during the test.

Network Vendors Alaska Communications System (ACS) DSL. The ACS DSL service provided 240 Kbps upstream service and 1 mbps downstream. This worked reliably throughout the test.

IP Gateway Vendors Motorola MotoBridge. The test configuration provided by Motorola used software that was still in development, and consequently was not fully documented. As time was spent with the product, a much better understanding of how the various software applications, logical and physical devices (Administrators Control Panel (ACP), OMC Server, work station and gateway unit) worked together. A more intuitive interface and complete documentation with a theory of operation would make this a more usable product. The ACP would seem to provide a network manager a good overall picture of

- 3 4 -

the operational network, but it was unclear what tool would be used by dispatch personnel to dynamically make and break patches between sites. Specific training would be needed by network management personnel to ensure the operational integrity of the system.

Twisted Pair. The system consisted of two devices at the remote location and the hub. The first was a Cisco router with IP voice cards installed and the other was a Windows 2003 Media Server. This is

a complicated but very capable system that seems to require a considerable amount of computer skill for proper setup. Once setup, the system seemed to remain stable and reliable during the short period we were able to test it.

Raytheon/JPS ACU1000. JPS excels at ease of setup; two of the test personnel with no specific training on the product were able to read the on line documentation and have it set up and operating in less than 10 minutes. Also noteworthy, was the simplicity of this application. It is not clear what other equipment and software is required to manage a large network of these devices. This device would be easy to support in remote Alaska due to its simplicity.

VPN Vendors End II End Communications Network Security Suite. The suite of software implemented on a server running a hardened LINUX OS provided an IPSEC virtual network tunnel between the two radio

gateways. The system used a 256 bit AES encryption algorithm and allowed the operation of both gateways inside private IP networks. This system performed flawlessly and had no measurable impact on network performance over the satellite IP network except that associated with the processing delay through the respective devices.

End II End preconflgured all the hardware so that set up was simple and fast. Only the VPN capability of the End II End security solution was used.

AREAS FOR FUTURE EXPLORATION: All of the interfaces within this test were at the speaker and microphone audio points or their

equivalent. This meant that three vocoder processes were always present and operating in series. We recommend that a system be eventually employed that allows for the direct digital connection of systems or stations to the VolP gateways. This would contribute significantly to the quality of the voice passed through the system. It may even be practical in the future to connect the stations and/or systems directly to the VPN equipment which would bypass the need for the VolP gateways. To accomplish this, either the VPN or the connected equipment would need to be equipped with voice store and forward to enable the required delays for control operations.

Software and hardware vendors should be encouraged to find ways to reduce the latency when operating over satellite circuits. A baseline test of IP telephones with one phone on the satellite terminal end and the other phone located on the intemet end of the circuit produced a latency of approximately 575 milliseconds. This is considerably less than the latency figures for two radio systems over a similar link. While some of the extra latency cannot be eliminated due to the timing delays necessary to accommodate LMR trunking systems, it seems probable that a future reduction is feasible. This would certainly make satellite based radio communications much easier and intuitive to use.

- 3 5 -

CONCLUSIONS: Testing performed during this exercise indicates that systems using VolP gateways and satellite links are both possible and practical. Several specific equipment configurations that can practically be implemented are contained within this report. Below are several general conclusions.

Delay or latency is part of the reality with satellite links. Expect total system latency in the range of 2.5 to 3 seconds. The IP/satellite link contributes roughly 2 seconds. The LMR equipment adds another 0.5 to 1 second depending on the configuration. While future satellite systems may reduce

link latency, it is possible to carry on a useful conversation with a little practice over IP/satellite linked systems.

Voice quality in the total system is very good, generally measured in the DAQ 4 range. This assumes operation in a LMR environment that would produce a DAQ 5 rating without any satellite link. The slight degradation in the linked environment is primarily due to the serial connection of three vocoders. The human ear cannot generally detect the difference between DAQ 5 and DAQ 4.

We recommend that implementations include VPN equipment such as the End II End equipment that was part of this test exercise. VPNs make addressing setup easier, more reliable, and provide the necessary encryption on the internet/satellite portions of the link.

Shared IP satellite IP services that provide sufficient quality of service to support VolP telephone to the PSTN can support trunked radio gateways. A mechanism such as a CIR is required to overcome the delay of initial bandwidth allocation. If such a mechanism is not used, audio loss at the beginning of the conversation becomes unacceptable.

IPSEC VPN solutions exist that can be employed over public shared satellite IP networks to provide an end-to-end security solution without degrading the satellite network performance or voice quality. However, they must be specifically tailored for use on satellite networks since the high latency of these networks greatly limits most VPN performance. For example, we tested an IPSEC VPN

implemented on CISCO Pix| Firewalls, and there was significant loss of packets when the VPN was up and stable. At times the VPN was not stable enough to support any communications through the tunnel.

The minimum bandwidth needed to support a radio channel with or without a VPN tunnel over a shared satellite IP network is 64 Kbps.

The public internet can be used in combination with a shared satellite IP network to provide a connection between two trunked radio networks without affecting network performance or voice quality, and this can be secured using an IPSEC VPN.

- 3 6 -

GLOSSARY:

ALMR Alaska Land Mobile Radio

CIR Committed Information Rate

COTS Commercial off-the-shelf systems or equipment

DAQ Delivered Audio Quality measured on a scale of 1 to 5 with 3.0 considered acceptable for most communications

IP Internet Protocol

IPSEC Internet Protocol Security

I_AN Local Area Network

QoS Quality of Service. High reliability provisioning of a circuit.

PTT Push to Talk

RaCE Radio Coverage Evaluator, an automated DAQ measurement system developed by CTA Communications of Lynchburg, VAo

Remote VSAT Very Small Aperture Terminal: Remote site satellite transceiver equipment

Satcom Satellite Communications

T&E Test and Evaluation

VolP Voice over Internet Protocol

VPN Virtual Private Network

WAN Wide Area Network

- 3 7 -

APPENDICES:

1,

2.

3.

4.

5.

6.

System Test Configuration Diagrams

Photos of the Test Operation

Enlarged views of screen capture figures

Satellite Network Configuration and Performance

Vendor Web Site List

Satellites and Satellite IP Service Providers serving Alaska

- 3 8 -

C o m m u n i c a t i o n s Test Report A P P E N D I X I - Drawings October 24, 2005

A P P E N D I X 1 - D R A W I N G S

These drawings were prepared by Microcom of Anchorage, Alaska.

The CTA RaCE equipment is not shown on these drawings. The RaCE Mobile equipment was connected to the Spectra Radio assigned to Satcom I closest to the center of the drawings. The RaCE Stationary equipment was connected to the Spectra Radio assigned to Satcom 2 at the lower right of the drawings.

Page I of 9

Communica t ions Test Report A P P E N D I X I - Drawings October 24, 2005

Network Drawings:

Test Configuration I" LBISat, MotoBridge, No VPN

l_BISat Hub \ South Jordan. ~

Galaxy IOR

~,~r tage

IDirec~ Net Modem II

I

o e c ~ _.L. I w o r ~ o . ~ ~-

IP Teleptlone A AL----- ~.

. ~ ~, / Spe~a Ra~

Spectra Ra~o Satonm 1

Spec~ Ra~o Satcom 2 Speclra Ra~o Salcom 2

Test Conflgur'~ion 1 LBIS~ and Motol~dge

No VPN

Page 2 o f 9

C o m m u n i c a t i o n s Test R e p o r t A P P E N D I X 1 - Drawings O c t o b e r 24, 2005

Test Configuration 2: LBISat, MotoBridge, End I1 End lntemet Security Gateway

\

MotoBddge End II End Intemet

S e c u ~

1.8 Meter VSAT

IDirect Net Modem II /

E ~ Hub

IP Telephone

Salem 1

Spectra Radio Spectra Radio Satcom 2 Satcom 2

Test ~ m a f i o n 2

End to End Intemet Security Product

J Pagc 3 o1"9

Communications Test Report APPENDIX 1 - Drawings October 24, 2005

Test Configuration 3: LBlSat, JPS ACU1000, End 1I End lntemet Security Gateway

Galaxy 1OR

i 1

LBIS~t Hub \ South Jordan,

ACU1000 End II End Intsmet

Security

1.8 Meter VSAT

IDirect Net Modem II

End II End Intemet secur~

Administrator's Work Station

Ethemm Hub

ACU1000

IP Telephone

Satcom 1

Spectra Radio Satcom 1

Spectra RadLo Satcom 2 Spectra Radio

Satcom 2

Test Conrlgur'at~n 3 I RISat and JPS ACU1000

End to End Intemet Security Product

COMM:N:CAI;O:~

Page 4 o f 9

Communications Test Report APPENDIX 1 - Drawings October 24, 2005

Test Configuration 4: NIASat, MotoBridge, No VPN

2 5 6 k b p A ~ s

ACS DSL Modem

Horizons 1

OMC Server WorkStation

( ~ 1.2 Meter VSAT

VmSat Linkstar Modem I

Ethemel Hub Cisco R o u t e r ~ themet Hub

Tel~one ~ M~176 E

Tel~one v ~!~" Satcom 1


MotoBddge

~ ----/___ Spectra Radio

Satcom 2 Spectra Radio Satcom 2

Test Configuration 1 LBISat and Motobridge

No VPN

J

V'mSat Hub Atlanta, GA

Page 5 ot'9

Communica t ions Test Report A P P E N D I X I - Drawings

Test Configuration 5:

LBISat Hub South Jordan, UT

~ J

LBISat, JPS ACUIO00, No VPN

512 Kbps

Galaxy 10R

128 kbps

lnternet ACS DSLModem

Test Configuration 5 LBISa~ and ACU1000

No VPN

October 24, 2005

( ~ 1.8 Meter VSAT

I IDirect Net Modem II

Ethemet Hub

ACU 1000

Administrators IP Telephone Work StalJon

Spectra Radio

ACU1000 Spectra Radio Spectra Radio ,Satcom 2 Satcom 2

Page 6 ot'9

Communications Test Report APPENDIX I - Drawings October 24, 2005

Test Configuration 6: NIASat, JPS ACU1000, No VPN

i I

ViaSat Hub Atlanta, GA

em

Horizons 1

Ethemet Hub

Z IP Telephone

ACU1000

r 1.2 Meter VSAT

/ ViaSat Linkstar Modem [ ~

Cisco Router

CU 1000

Administrator [ WorkStation ~ -~==~___, ~

_~ ~/Spectra Radio �9 / Satcom 1


Spectra Radio Satcom 2 Spectra Radio

Satcom 2

Test ConfiguralJon 6 NIASat and ACU1000

No VPN

CQ~$~; CALYX5

Page 7 of 9

--Communications Test Report APPENDIX ! - Drawings October 24, 2005

Test Configuration 7: NIASat, MotoBridge, End II End lntemet Security Gateway

bps

em

Horizons 1 ~ 1.2 Meter VSAT

I ViaSat LinkStar Modem

/ End 11 End Intemet

Ethemet OMC Server Hub ~ St aii-on ~ 7 ' 1

[ ~ ~ MotoBndge

IP Telephone

~!~" , ~ t ~ m 1


Spectra Radio End II End Internet Satcom 2 Satcom 2

Security

Test Configuration 7 NIASaI and Motobridge

End to End Internet Security Product

j <

Via,Sat Hub Atlanta, GA

Page g o f 9

Communications Test Report A P P E N D I X 1 - Drawings October 24, 2005

Test Configuration 8: NIASat, JPS ACU1000, End II End lnternet Security Gateway

s

em End II End Intemet Security

Horizons 1 "~ ( ~ 1.2 Meter VSAT

I ViaSat LinkStar Modem [ ~

~ End II End Intemet

Administratar Workstatio n ~ . ~ L ~ Ethemet Hub

~ ACU1000

IP Telephone

~1~" Satcom 1


==j - - - Spectra Radio

Satcom 2 Spectra Radio Satcom 2

Test Configuration 8 NIASat and ACUIO00 End to End Intemet Security Product

VB Sat Hub Atlanta, GA

CO~:'ML~J CA~iO~

Page 9 of 9

Communications Test Report A P P E N D I X 2 - Photos of the Test Opera t ion October 24, 2005

A P P E N D I X 2 - P H O T O S O F T H E T E S T O P E R A T I O N

T

A pair of satellite connections could be made at any one time.

Front view of the RaCE automatic DAQ measurement equipment.

The JPS Raytheon equipment.

Test facility loaned by the City of Anchorage.

An obviously temporary interface to the test radios.

Setup in progress.

--.,,... CO %'~,,:Ul', 'C.P, TIL"%'d ~,

Page ! of 2

Communica t i ons Test Repor t A PPENDIX 2 - Photos of the Test Opera t ion October 24~ 2005

Rear view of the RaCE equipment showing the An early version of the JPS equipment. timing interface box.

An early test in progress. Motorola Motobridge equipment.

Another view during setup. A test in progress. The operation was very computer intensive. Additional photos are available on the accompanying data disk.

~ J

CO~r

Page 2 of 2

Communications Test Report APPENDIX 3 - Enlarged views of the Screen Capture Figures October 24, 2005

A P P E N D I X 3 - E N L A R G E D V I E W S O F T H E S C R E E N C A P T U R E F I G U R E S

These images are also available electronically on the data disk.

Software is included on the data disk to allow detailed exploration of the records that these screen capture images were derived from.

COMMUNICAIIONS

Page I of 17


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P a g e 2 o f i 7

Communications Test Report APPENDIX 3 - Enlarged views of the Screen Capture Figures O c t o b e r 2 4 , 2005

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Page 12 of 17

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Page 13 of 17

Communications Test Report A P P E N D I X 3 - Enlarged views of the Screen Capture Figures October 24, 2005

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Page 14 of 17

Communications Test Report A P P E N D I X 3 - Enlarged views of the Screen Capture Figures O c t o b e r 24, 2 0 0 5

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Page 15 of 17

Communications Test Report A P P E N D I X 3 - Enlarged views of the Screen Capture Figures O c t o b e r 24, 2005

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Page 16 of 17


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Page 17 of 17

Communications Test Report APPENDIX 4 - Satellite Network Configuration and Performance October 24, 2005

A P P E N D I X 4

S A T E L L I T E N E T W O R K C O N F I G U R A T I O N A N D P E R F O R M A N C E

LBiSat Configuration and Performance

Anchorage, AK VSAT: 1.8 meter antenna 2 watt Ku band block up-converter Norsat 4506A Ku band low noise block down-converter iDirect NetModem II Galaxy 10R (123 degrees W) Horizontal transmit polarity 128 kbps (upload), 512 kbps (download) 8 kbps committed information rate (CIR) Average latencyg: 693 ms JitterZ: 90ms

South Jordan, UT Hub: 6.1 Meter antenna iDirect TDMA Hub

Overall Summary: LBISat performance throughout the test period was excellent. One outage less than 5 minutes in duration was noted due to extremely heavy rain. At the end of the test, the link speed was turned down to 64 kbps for both upload and downloads to determine if the radio gateways could operate effectively at a lower bandwidth. The system was able to support both tested radio gateways at the 64 kbps speed.

NIASat Configuration and Performance

Anchorage, AK VSAT: 1.2 meter antenna 2 watt Ku band block up-converter ViaSat DRO Ku band low noise block down-converter ViaSat LinkStar Modem Horizons 1 (127 degrees W) Vertical transmit polarity Symmetrical 256 kbps (upload and download) Average latency I" 708ms JitterZ: 1 lms

Atlanta, GA Hub: 7.2 Meter antenna ViaSat DVB/RCS Hub

Overall Summary: NIASat performance throughout the test period was excellent. One outage of less than 3 minutes in duration was noted due to extremely heavy rain.

t Round trip time between the remote VSAT and the LBISat DNS server. : Standard deviation o f 1000 roundtrip time measurements.

~ ~ Page I of I

Communications Test Report APPENDIX 5 - Vendor Web Site List October 24~ 20115

APPENDIX 5

VENDOR WEB SITE LIST

Satellite Networks:

N1ASat (www.getnia.com) LBISat (www.lbisat.com) Starband (www.starband.corn)

Radio Gateways

Motobridge (www.motorola.com) JPS ACU 1000 (www.jps.com) Twisted Pair (www.twistpair.com)

VPN Solutions

Cisco Pix 506 Firewall (www.cisco.com) End II End Gateway Security and Optimization Solution (www.eiiecomm.com)

CO:~'V, bN'CAItt~Zq$

Page I of l

APPENDIX 6

Satellites and Satellite IP Service Providers

Serving Alaska

Abstract: Th& paper was prepared as part o f a contract to support the National Law Enforcement and Corrections Technology Center--Northwest and Chenega Technology Services Corporation in their effort to test and evaluate voice over hlternet protocol (VoIP) trunked radio services transiting a satellite [P network. The paper identifies basic satellite technologies in use today, the spectrums where they operate, characteristics o f lP services over satellite, and listing o f satellite IP service providers who potentially could offer service solutions in the Alaska Land Mobile Radio network.

Prepared by: Tom Brady Microcom 1143 East 70 Ih Ave Anchorage, AK 99518 907-264-0016 tom(a')sa leo.corn

Under contract to:

Chenega Technology Services Corporation 5971 Kingstowne Village Parkway Suite 100 Alexandria, VA 22315 Purchase Order No. 4000.39-05-Microcom-001

August 16, 2005

Revised October 21, 2005

1/27/2006

Purchase Order No. 4000.39-05-Microcom-001

Satellites and IP Satellite Networks Serving Alaska

!. Executive Summary

Since a large portion of rural Alaska is exclusively dependent on some form of satellite service for communications, the ability to build a state wide land mobile radio network that includes rural Alaska is dependent on successfully using satellite systems to control the remote radio sites and pass the voice and data services. In the last 4 years multiple satellite broadband IP networks have been deployed in North American service that are operated both by telecommunications carriers based in Alaska and elsewhere in North America. Many of these carriers have implemented shared bandwidth services and are offering services at a much lower price than dedicated satellite services. In addition, they are using software and hardware that is optimized for provided IP services over a high latency satellite link.

The satellites and satellite services in this paper use either C-band or Ku band satellite platforms. Both of these bands have a long term track record of providing reliable service throughout North America, the major difference being the size and cost of the equipment needed to use C-band is generally much greater than Ku-band. On the positive side, C-band does not experience the same degree of signal loss in heavy rain. From a network reliability perspective, properly designed satellite networks should have comparable reliability. The shared satellite IP services share both outbound bandwidth to the remotes and the return channels back from the remote to the hub. Sharing basically means that a given group of users shares bandwidth among themselves. In this environment, one user is not allowed to dominate all the bandwidth, but if there is no other demand for service, a single user will see performance close to that experienced on a dedicated circuit.

There are currently six satellites currently in orbit that significant service to at least mainland and Southeast Alaska (Galaxy 10R, Galaxy 13/Horizons 1, lntelsat Americas 7, and AMC-8). Four of these satellites provide coverage over all of Alaska (Galaxy 10R C-band, Galaxy 13 C-band, lntelsat Americas 7 C and Ku Band, and AMC- 8 C-band). There is a scheduled launch of a satellite in November of this year (AMC- 23) that will provide Ku-band coverage of all of Alaska. There are six service providers on these six satellites, one on C-band, one on C/Ku band, and 4 on Ku band only. Only 3 service providers cover the entire state (ATT, GC1, and Starband) and the others cover mainland and southeast Alaska (LBISAT, NIASAT, DirecWay).

Given the number of network operators, it should be possible to obtain competitive pricing for any network architecture ranging from dedicated point to point IP service, publicly shared IP services, or a private shared IP satellite service

I/27/2006


!I. Satellites and Spectrum

For purposes of this study, we are only concerned about geosynchronous satellites in commercial service. While there are non geostationary satellites in service providing digital voice services, e.g., Iridium and Globalstar, they are not considered suitable for satisfying the needs of the ALMR program.

Commercial Communications Satellites Geosynchronous Orbit

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The drawing above shows a representation of the satellites in service in the geosynchronous orbit. By definition this orbit is located approximately 22,500 miles above the equator. Because the majority of Alaska is located above 60 degrees north latitude, any geosynchronous satellite will be at a low elevation angle compared to most other regions of the world. For example in Anchorage, the satellite with the highest elevation angle is an EchoStar satellite at 148 degrees west longitude. Its elevation angle is 20.6 degrees. In order to realistically serve all of Alaska at a reasonable elevation angle (>5 degrees), a satellite would have to be located between 112 degrees west longitude and 172 degrees east longitude. To put that in perspective in the figure above, that would be approximately those satellites between clock positions 7 and 9. There is a discussion later in this paper of specific satellites that are of interest to Alaska.

The best way to conceptually view satellites is the same as active microwave repeaters. With very few exceptions, a satellite takes in signals on a specific frequency, amplifies them, and transmits them out on a different frequency. It does not process or in

1/27/2006 3

Purchase Order No. 4000.39-05-Microcom-O01

any way affect the data that transits the satellite. There are plans for some newer satellite constellations (Spaceway, www.spaccwau for example), to actually provide a switching matrix in the satellite to more efficiently route data between satellite terminals. This however, is not available today.

There are several portions of the radio frequency spectrum in use by commercial geosynchronous satellites ranging from 350 MHz (UHF) up to 30 GHz (Ka band). The discussion in this paper is limited to C-band (4/6 GHz) and Ku-band (12/14 GHz) as they are the only commercial satellite systems in general use today that provide IP services. Ka band services are just being deployed in the residential and small business market. None are on satellites that could provide any meaningful service in rural Alaska and to date the reliability of service using the Ka band is unknown.

I!I. IP Services over Satellite

There are numerous ways to handle IP services over satellite networks, but most service providers generally have three areas where they implement specific hardware and software solutions to efficiently provide service. These areas are:

Managing and allocating satellite bandwidth Grooming of lP for satellite Networks Handling of lP Data at the hub earth station attd remote VSA Ts

Managing and Allocating Satellite Bandwidth

In its most basic form, satellite bandwidth is allocated on the single channelper carrier (SCPC) model. In other words you buy the ability to transmit a given amount of data (also referred to as bandwidth) between two points. This is the most expensive way to manage satellite bandwidth in a network. On many of these SCPC networks, there is no special consideration given to grooming IP for transmission over a high latency network and the interface to the customer equipment uses no special standard other than that associated with digital data services. In other words, the customer has essentially leased a point to point data circuit and elected to place IP services on it. Due to the latency of the network there are some distinct physical limitations on this type of service when used for handling IP. The most significant of which is the maximum throughput regardless of the size of the transmitted carrier is limited to 400 kbps in a single session unless equipment is used on each end to groom the IP stream for a satellite network. The figure below shows an example of an SCPC satellite network.

I/27/2006


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1/27/2006


The two most prominent technologies used in shared satellite networks are:

TDMA--Time Division Multiple Access. In this technology, a remote terminal is assigned a time slot on a fixed carrier. For example, the cartier may be 192 kbps, meaning when the modem is sending data, it is transmitting at a line rate of 192 kbps. Based on network loading, you could be assigned multiple time slots to send data. The maximum throughput rate would be the line rate of 192 kbps. The only way to get more throughput is by transmitting a larger carrier.

SCPC DAMA--Single Channel per Carrier Demand Access Multiple Assignment. In this scenario, the carrier is not shared over time, but allocated to a specific remote terminal on demand. Once assigned, there is no division of the carrier into multiple time slots. You get the line rate of the carrier until it is released back to the DAMA pool. Some systems using SCPC DAMA increase throughput to the user by aggregating several smaller carriers together.

Handling IP Data in the Satellite Net~vork

There are three competing technologies for handling data that are standards based (trying to set the standard) and vendor unique technologies that are imbedded in the satellite modem and hub equipment. Inherent in these data handling technologies is some type of processing of IP packets to allow faster speeds than 400 kbps in a single IP session. This IP acceleration is generally vendor specific and may take several forms and be implemented in hardware or software or both. IP acceleration can also be applied in SCPC IP services in the same manner. Below is a summary of the three data handling standards that are being proposed:

DOCSIS. As the name implies this is the same standard that is used in cable modems with some additions to handle satellite networks. The reason this standard is being used is it tends to lower the cost of terminal equipment as it uses existing chipsets. This is being used by satellite providers such as Wildblue and ViaSat in the US. (ViaSat is also the manufacturer of this type of shared satellite technology.)

DVB-RCS. This acronym stands for digital video broadcast--return channel satellite. DVB is the same standard used in direct broadcast satellite networks or digital cable networks. As an existing standard, it also has access to lower cost chipsets for terminal equipment. This is being used by EchoStar Data Networks and ViaSat in the US.

IPoS. This is a Hughes network developed standard other wise known as IP over Satellite and is used in the Hughes DirecWay network. No other service provider uses this standard but the size of the DirecWay customer base makes it a de facto standard.

However, most shared hub networks are using proprietary systems, the most prevalent of which is the IDirect hub manufactured by IDirect Technologies,

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www.idirect.net. Operators using the IDirect platform include Lyman Brothers, Tamsco, and GCI.

IV. Sate l l i t e s o f I n t e r e s t to A l a s k a

While many satellites can be used in portions of Alaska, very few satellites are capable of providing two way services over the entire state at a reasonable level of performance. A reasonable level of performance is defined as providing effective incident radiated power (EIRP) comparable to that provided to other regions of the country and G/T (a measure of the satellite's ability to receive transmissions from the ground) that does not require the use of unusually large transmitters. While this is a somewhat loose definition, it does effectively limit the number of satellites of interest to Alaska to the following:

a. Galaxy 10R, 123 degrees. A C/Ku band satellite with very good coverage of Alaska at C-band and coverage at Ku band limited to mainland Alaska. Some services have been deployed to St Paul Island and Dutch Harbor on the Ku band portion of Galaxy 10R, but they required the used of much larger antennas and satellite radios with significantly greater transmit power. The drawings below show Galaxy 10R coverage of Alaska.

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b. Galaxy 13/Horizons 1, 127 degrees. A C/Ku and satellite that provides essentially the same level of service to Alaska as Galaxy 10R. The Alaska coverage is shown in the drawings below.

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Intelsat Americas 7 (IA-7), 129 degrees. This satellite was originally named Telestar 7. It was the first satellite to provide Ku band coverage of all parts of Alaska including the Aleutians. In December 2004, the power system on this satellite suffered a major anomaly resulting in the loss of half of the transponder capacity. The long term prognosis on this satellite is unknown. No replacement has been announced. Alaska coverage of IA-7 is shown below.

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C-band

K u - b a n d

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10

d. AMC-7, 137 degrees. This C-band satellite was designed as an "airborne" spare for AMC-8. It provides a reasonable amount of C-band service to the entire state. AMC-7 coverage of Alaska is shown below.

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e. AMC-8/Aurora Ill, 139 degrees. This satellite jointly owned by SES and ATT was specifically designed to provide enhanced C-band service to Alaska. AMC-8 coverage of Alaska is shown below. This does not show the special coverage of Alaska provided by the Aurora III transponders.

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f. AMC-23. 172 degrees east longitude. This satellite is scheduled to be launched in November 2005 specifically to provide service to Boeing Connexcion (www.boeingconnexcion.com). Boeing Connexcion offers broadband IP service to aircraft and ships in the Pacific Ocean Area. Ku band

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II

coverage of this satellite includes all of Alaska. SES Americom indicated that there would be available capacity on this satellite.

Of the twelve satellites in the geosynchronous orbital arc that could potentially provide service to Alaska (that portion of the arc west of 110 degrees west longtitude) only five can realistically do so based on their design. This limits access to network providers.

V. Service Providers on these Satel l i tes

Service Provider LBISAT (Lyman Brothers) www.lbisat.com

NIASAT www.getnia.com

Starband/SpaceNet www.starband.com

DirecWay (Ground Control) www.direcway.com

ATT Alascom

General Communications lnc

Hardware Architecture IDirect Shared Hub TDMA, Proprietary data handling

ViaSat Link Star, Shared Hub TDMA, DVB RCS Gilat 484 Shared Hub TDMA, Proprietary data handling Hughes Networks Shared Hub TDMA, IPOS

Single Channel Per Carrier digital data service SCPC DAMA Shared Hub TDMA,

Satellite Galaxy 1 OR (123 degrees)

Horizons 1 (127 degrees)

Intelsat Americas 7 (129 degrees) Horizons 1 (127 Degrees)

Aurora III (139 degrees)

Galaxy 1 OR (123

Major Users Individual government and business subscribers, remote ISP's, small multi-site networks. Individual business subscribers and small multi-site networks Residential and small businesses.

Residential, small business, and enterprise customers in private networks. ISP's, schools, libraries, health care, and rural businesses. ISP's, schools, libraries, health care,

www.t~ci.com

Boeing Connexion www.boeingconnexcion. c o i...___~.~

Tamsco www.tamsco.colll

Proprietary data handling

Unknown

degrees), AMC-7 (137 degrees) AMC-23 (172 degrees east)

Shared Hub TDMA, Propietary data handling

Galaxy 1 OR (123 degrees east)

and rural businesses.

Aircraft and ships operation in the North Pacific ocean area. Schools, libraries, and health care

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VI. Comparative Network Analysis

It is very difficult to compare satellite IP networks based on cost and performance; however, there are some generalizations that can be drawn. The most costly satellite network when looking at day to day operating costs would use single channel per carrier (SCPC) technology such as that offered by ATT. The least costly network would be a shared network directed at consumers such as those offered by Starband and DirecWay. In the middle are those shared networks offered by LBISAT, NIASAT, and DirecWay's Enterprise service. The quality of service/performance is controllable by the network provider and the customer is charged accordingly. To put a dollar value on this, the range is from $49.99 per month fbr Starband consumer service to more than $13,000 per month for a dedicated 1.54mbps of IP service over an SCPC satellite channel. On the consumer service you can check your e-mail and surf web pages while on the dedicated service you can provide high levels of service for voice and video IP traffic. It cannot be over emphasized that the primary driver on quality is price and not necessarily the technology being deployed. The most import aspect is to match the network to the need. Shared networks are great if traffic loads vary over time and spike infrequently. As traffic loads go up, shared networks can be closely managed to insure a good quality of service. Interestingly, there have been no definitive studies of how scalable a shared network architecture can be in the face of increasing network traffic needs and what evolutionary path these networks will take over time to respond to those needs.

VIi. Network Planning Considerations

One of the most important things to understand about any satellite IP network is the customizations, if any, the service provider has implemented to enhance performance of various types of IP traffic. Most satellite networks have enhancements that target TCP packets and in some cases specific IP ports such as port 80 used for world wide web traffic. In planning a satellite IP network of a single site or multiple sites, profiling the type of IP traffic that will transit the network and reaching an understanding with the network provider on how that traffic will be processed is extremely important. For example, operating any type of IPSEC virtual private network (VPN) or a satellite link has always been problematic. With that in mind, here is a laundry list of items to consider when looking for a satellite IP network:

Type and volume of lP traffic Aggregation rate of the provider IP enhancements of the provider

TCP Acceleration VPN Support

QOS implementations Voice Video

Criticality of service 7x24 Network Operations Support

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Emergency plans in event of satellite failure Redundancy at gateway earth station Remote site redundancy and sparing Remote site maintenance

Network Security Satellite Path Encryption

Vlll . Conclusion

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In the last five years the number of broadband satellite operators that provide service to Alaska has increased substantially. From two network providers, the state now has at least six. However, the number of satellites providing that service has for the most part remained the same. While Galaxy 13 represents a new satellite platform, the partial failure of Intelsat Americas 7 offsets that increase. The deployment of Ka band satellite services by Wildblue/Telesat Canada, Spaceway, and possibly EchoStar Data Networks will have an indirect impact on Alaska as they affect the fate of Starband and the DirecWay consumer service. Successful deployment of these Ka band consumer services (Wildblue/Telesat service is currently available and the other satellites have been launched) will probably mean the demise of Starband and DirecWay's consumer service, but will have the effect of making additional bandwidth available on Horizon's 1 and lntelsat Americas 7. The key to fielding a satellite IP network in support of the Alaska Land Mobile Radio project is the availability of satellite capacity of the right type and quality and a network operator. Those both seem to be available in the near term.

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