ad-a283 963 operational (ot&e) integration and ot&e dti · dan smith alcatel rick daugherty...

AD-A283 963

23-Gigahertz (GHz) Digital LowDensity Radio CommunicationsLink:(LDRCL) Operational Test andEvaluation (OT&E) Integration andOT&E Operational Final Test ReportMichael R. Melillo DTI

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August 1994

DOTIFAA/CT.TN94/27

Docnt is on file at the Technical Cenlbrary,Atlantic C*agntoaAioNDI45.

(4 DOTFCTTN2 .94-27428

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NOTICE

This documentis disseminated under the sponsorshipof the U.S. Department of Transportation In the Interest ofInformation ochange. The United States Governmentassumes no liability for the contents or use thereof.

The United States Government does not endorseproducts or manufacturers. Trade or manufacturers'names appear herein solely because they are consideredessential to the objective of this report

Technical Rawe. Documentation paeg1.*ee e.2 Gvrnme~t A@e55gsa& No. 3. Recipient9 a Ceteleg Ne.

4. Me&W SutitleS. Report Dots23-GIGAHERTZ (GHz) DIGITAL LOW DENSITY RADIO August 1994COMM(UNICATIONS LINK (LDRCL) OPERATIONAL TEST 6. Porlormsn. Ogw,,aett.a CodeAND EVALUATION (OT&E) INTEGRATION AND OT&EOPERATIONAL FINAL TEST REPORT 11. Performing Ortans ael..a Roper? Ne.

Michael R. Melillo DOT/FAA/CT- TN94/2 7

9. P..imemino Ovgea'enieo Nae mitad Address 10. Work Unit Ne. (TRAlS)U.S . Department of TransportationFederal Aviation Administration 11. Contract at Gfeit No.Technical CenterAtlantic City International Airport, NJ 08405 13, Typ of Roer nd Period Coe.red

12. Sponsoring A~eyMem o. anid Addeo**U .S. Department of TransportationFederal Aviation Administration Technical NoteTechnical Center 14. Speognsoig Agencyp CedeAtlantic City International Airport, NJ 08405

15. S. lomatener Notes

16. Abstract

This report contains the results of the operational Test and Evaluation (OT&E)Integration and OT&E Operational Testing of the Commercial-Off-The-Shelf (COTS)Low Density Radio Communications Link's (LDRCL) 23-gigahertz (GHz) digital radiosystem. The OT&E testing was accomplished by first testing the LDRCL equipmentagainst its equipment specification (FMA-E-2853A), and then performing OT&E testingat the key site (Keller, Texas). These tests proved that the 23-Gui LDRCLequipment can fulfill its mission in the. National Airspace System (NAS) and that itis suitable and effective.

Based on the test results, it is concluded that the 23-GHz LDRCL equipment isqualified for operational deployment.

I? Key Words 018. DAeuwem Satesmmt

Low Density Radio Communications Link Document is on file at the Technical(LDRCL) Center Library, Atlantic City

23-GHz Digital Radio System International Airport, NJ 08405

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TABLE OF CONTENTS

Page

EXECUTIVE SUMMARY v

1. INTRODUCTION 1

1.1 Background 11.2 Purpose 11.3 Participants 11.4 Reference Documents 2

2. TEST APPROACH AND CONCEPT 3

3. TESTS AT THE FAA TECHNICAL CENTER 4

3.1 Operational User's Requirement Test Verificacion Req, irements 4Traceability Matrix (TVRTM) Tests (ApperLlix B)

3.2 System Level/Integration Test Matrix Tests (Appendix C) 6

4. OT&E INTEGRATION TESTS AT KEY SITE 6

4.1 FAA-E-2853A TVRTM Tests (Appendix A) 74.2 Operational User's Requirement TVRTM Tests (Appendix B) 74.3 System Level/Integration Matrix Tests (Appendix C) 8

5. TEST RESULTS 9

5.1 Test Results at the FAA Technical Center 95.2 OT&E Integration Test Results 9

6. CONCLUSIONS 10

6.1 Test Conclusions at the FAA Technical Center 10

6.2 Operational Test and Evaluation (OT&E) Integration Test 11Conclusions

7. RECOMMENDATIONS 13

8. ACRONYMS AND ABBREVIATIONS 14

AP ixES

A - FAA-E-2853A Test Verification Requirements TraceabilityMatrix (TVRTM)

B - Operational User's Requirements Test Verification RequirementsTraceability Matrix (TVRTM)

C - System Level/Integration Test Matrix

iii

LIST OF ILLUSTRATIONS

Figure Page

I LDRCL 23-GHz Digital Subsystem Test Configuration 3

2 Typical NAS System Level Block Diagram 5

3 Subsystem Block Diagram 5

4 Typical NAS System Block Diagram 7

LIST OF TABLES

Table Page

1 23-G•z Digital System Equipment 4

iv

EXECUTIVE SU1¥RY

This test report describes the results of the Operational Test and Evaluation(OT&E) Integration and OT&E Operational testing performed on the Low Density RadioCommunications Link (LDRCL) 23-gigahertz (GHz) digital radio system installed atthe Keller, Texas, Air Route Surveillance Radar (ARSR) site. The OT&E effort wasconducted by Federal Aviation Administration (FAA) Technical Center personnelduring the period of February 10 through 18, 1994.

The LDRCL is comprised of nondevelopment items (NDI) from the manufacturers listedbelow and integrated into the LDRCL system by Alcatel Communications and GovernmentSystems of Richardson, Texas.

MicroNet 23 Digital Radio Microwave Networks, Inc.

Digital Channel Bank Wescom

Battery/Charger Power Conversion Products (PCP)

Remote Alarm Westronic

During testing at the FAA Technical Center and the Keller, Texas, test site, it wasfound that this equipment did not meet all of the FAA-E-2853A specifications. Itmust be noted that this equipment is NDI and was not specifically designed to meetall of the 23-gigahertz (GHz) LDRCL requirements. FAA Order 1810.6, Policy for Useof Nondevelopmental Items (NDI) in FAA Acquisitions, allows for the deployment ofNDI equipment that does not meet all specification requirements, provided theequipment is operationally effective and suitable prior to commissioning of thesubsystem.

The following areas are of concern:

1. The LDRCL equipment when equipped with Total Harmonic Distortion (THD)filters meets all of the requirements in Order 6950.2C for the critical alternatingcurrent (A/C) power bus with the exception of the time requirement for the in-rushcurrent to return to 110 percent of its normal value.

2. Without THD filters, this equipment exceeds the THD requirement for theinput current for equipment connected to the critical AC power bus.

3. Radio Frequency Interference (RFI) filtering must be added to the powerconnections to the Westronics Alarm System.

4. A sensing circuit must be added to indicate when the Low Voltage BatteryDisconnect (LVBD) has failed.

v

In response to our concerns, the program office has agreed to install THD filtersin all systems that will be connecced to the critical power bus and add a RFIfilter to the Westronic Alarm System. A Engineering Change Proposal (ECP) is beingprepared to resolve the LVBD failure problem. The program office will request awaiver for the in-rush current time specification contained in Order 6950.2C sothat LDRCL could be connected to the critical AC power bus.

Deployment is recommended with the conditions noted in section 7 of this report.

vi

This report describes the results ot the Low Density Radio Communications Link(LDRCL) Operational Test and Evaluation (OT&E) Integration and OT&E Operationaltesting performed in Keller, Texas, and at the Federal Aviation Administration(FAA) Technical Center. The testing was performed in Keller, Texas, during theperiod of February 10 through February 18, 1994, with additional testing performedat the FAA Technical Center to reverify test data or complete testing that couldnot be performed at the key site.

1.1 BACKGROUND.

The LDRCL procurement (Specification FAA-E-2853A) will provide equipment toreplace and upgrade existing links, leased systems, and new requirements for datacommunications for various National Airspace System (NAS) plan projects implementedin 1990 and beyond. Some of the current links that will be replaced are the shorthaul user access links and leased lines remoting circuits which currently provideconnections between operational facilities such as Air Traffic Control Towers(ATCT), Terminal Radar Approach Control (TRACON), and remote sites such as RemoteCommunications Air-to-Ground Facility (RCAG), Air Route Surveillance Radar (ARSR),Airport Surveillance Radar (ASR) and others.

The purpose of this report is to describe the OT&E Integration and OT&E Operationaltesting performed on the 23-gigahertz (GHz) digital radio system and ACW-400A'sreasons for recommending deployment of the system, at this time.

1.3 PARTICIPANTS.

ORGAliIZATIM

Wayne Bell FAA Technical Center (APMT)

Michael R. Melillo FAA Technical Center (Lead LDRCL projectengineer) ACW-400A

Fritz Chey Martin Marietta

Trinh Do FAA (TOR)

Dan Smith Alcatel

Rick Daugherty Alcatel

Herman Rigdon Alcatel

1

ijk RE•IUCK DOCUMENTS.

FAA Snecifications

FAA-G-2100 Electronic Equipment, General Requirements

FAA-E-2853A Low Density Radio Communications Link Specification

FAA-STD-024A Preparation of Test and Evaluation Documentation

FAA-STD-028 NAS Training Guidelines

FAA-STD-013/016/018 Quality Control Program Requirements

FAA-STD-021 Configuration Management

FAA-STD-020A Transient Protection, Grounding, Bonding andShielding Requirements for Equipment

1810.4B FAA NAS Test & Evaluation Program

1810.6 Policy for use of Nondevelopmental Items (NDI)

in FAA Acquistions

OAP 8200.1 U.S. Standard Flight Inspection Manual

6000.3 Maintenance of FAA Communications System

6950.2C Electrical Power Policy Implementation atNational Airspace Facilities

NAS Docgment

NAS-SS-1000 NAS System Specification, Functional andVolume I Performance Requirements for the National

Airspace System, General

NAS-SS-1000 NAS System Specification, (Ground to AirVolume III Element)

NAS-SS-1000 National Airspace System, System Requirements

Volume I Specification

HAS-MD-110 AS Test Terms and Definitions

NAS-IR-44010001 Digital Interface Requirements

NAS-IR-44010002 Analog Interface Requirements

2

Other Documeint

ISO-7498 Open Systems Interconnection Standards(Information Processing System)

EIA RS-195 Electrical and Mechanical Characteristicsof Microwave Relay System Antennas andPassive Reflectors

PUB 62411 Accunet T1.5 Service Description andInterface Specifications

Bell Labs American Digital Hierarchy

International Radio Radio-Frequency Channel Arrangements forConsultative Committee: Radio Relay Systems

CCIR REC 283-4

CCIR REC 275-3 Pre-Emphasis Characteristics for FrequencyModulation Radio-Relay Systems for Telephonyusing FM Multiplexing

2. TEST APPROACH AND CONCEPT.

The test approach and concept was to evaluate the LDRCL equipment in accordancewith the Low Density Radio Communications Link (LDRCL) Master Test Plan and theLow Density Radio Communications Link (LDRCL) Operational Test and Evaluation(OT&E) Integration and Operational Test Plan. This involved testing therequirements contained in the LDRCL Specification FAA-E-2853A associated withthe 23-GHz radio system which are contained in appendix A of this document, theNAS-SS-1O00 Operational User's Requirements which are contained in appendix B ofthis document, and requirements contained in the System Level/Integration TestMatrix contained in appendix C of this document.

The LDRCL subsystem used for the OT&E Integration and OT&E Operational tests wascomprised of terminal equipment at the Keller ARSR and Radio Communications LinkRepeater (RCLR). A block diagram of the test configuration is provided in figure 1and a list of the equipment that was tested at Keller and/or the FAA TechnicalCenter is listed in table 1.

Keller KellerARSR RCLR

Terminal TerminalStation Station

FIGURE 1. LDRCL 23-GHz DIGITAL SUBSYSTEM TEST CONFIGURATION

3

TABLE 1. 23-GHz DIGITAL SYSTEM EQUIPMENT

Equipment Terminal 1 r Terminal 2

Micronet 23 Digital Radio Qty 1 Qty 1

DS1 Croisconnect Qty 1 Qty 1

Wescom Channel Bank (Redundant) Qty 1 Qty 1

Westronic Alarm System Qty 1 Qty 1

202T modem for above Qty 1 N/A

24-channel jackfields Qty 1 Qty 1

Standalone Fault Monitor N/A N/A

Modem for above N/A N/A

Battery Charger System Qty 1 Qty 1

4 Wire E&M VF cards Qty 2 Qty 2

4 wire E&M E/R cards Qty 24 Qty 24

Transmission Only E/R cards Qty 1 Qty 1

3. TESTS AT THE FAA TECHNICAL CENTER.

The testing done at the FAA Technical Center was used to verify requirements thatcould not be tested in the field and reverify data collected in the field. Thetesting done at the FAA Technical Center was limited due to the late availabilityof the equipment at the center. The testing that was accomplished is listed in thefollowing sections.

3.1 OPERATIONAL USER'S REOUIREMENT TEST VERIFICATION REOUIREMENTS TRACEABILITY

MATRIX (TVRTN) TESTS (APPENDIX B).

3.1.1 HAS System Level Tests.

These tests were run to evaluate that the LDRCL equipment can suitably andeffectively interface with other NAS subsystems. Figure 2 is a typical NAS systemlevel block diagram of the test configuration used. The Transmission ImpairmentMeasuring Sets (TIMS) simulate users.

4

TINS LDRCL LDRCL RCLVF TERMINAL RF TERMINAL VF TERMINAL

STATION - STATION - STATION

RF

RCL TINSREPEATER VFSTATION -

FIGURE 2. TYPICAL NAS SYSTEM LEVEL BLOCK DIAGRAM

The following NAS system level tests were run at the FAA Technical Center:

a. Audio Quality Tes- LDRCL to Radio Coumunications Link (RCL)

(TVRTM test #1),

b. LDRCL/RCL Critical Circuit Interface Test (TVRTM test #9).

3.1.2 Subsystem Level Tests.

These tests were run to see that the LDRCL subsystem met certain criteriaestablished by the program office in the Master Test Plan. (MTP). Figure 3 isa typical block diagram for a subsystem level test.

Test Set Radio Radio Test SetSystem System

FIGURE 3. SUBSYSTEM BLOCK DIAGRAM

5

The following subsystem level tests were run at the FA Technical Center:

a. Crosstalk (TVRTM test #2),

b. Alarms Indication Test during transients (TVRTM test #3),

c. Maintainability Test (TVRTM test #4),

d. Line Replaceable Unit (LRU) Removal/Replacement Test (TVRTM test #5),

e. LDRCL Electromagnetic Interference (EMI)/Radio Frequency Interference(RFI) Test (TVRTM test #11).

3.2 SYSTEM LEVEL/INTEGRATION TEST MATRIX TESTS (APPENDIX C).

3.2.1 NAS System Level Teats.

These tests were run to evaluate that the LDRCL equipment can suitably andeffectively interface with other NAS subsystems. See figure 2 for a typicalHAS system level block diagram of the test configuration used. The TIMS simulateusers.

The following NAS system level tests were run at the FAA Technical Center:

a. Modem to LDRCL Test,b. ARMS to LDRCL Interface Test,c. Total Harmonic Distortion Test,d. In-rush Current Test.


These tests were run to see that the LDRCL subsystem met certain criteriaestablished by the FAA Technical Center in the Low Density Radio CommunicationsLink (LDRCL) Operational Test and Evaluation (OT&E) Integration and OperationalTest Plan. Figure 3 is a typical block diagram for a subsystem level test.

The following subsystem level tests were run at the FAA Technical Center:

a. Envelope Delay Distortion Test,b. Frequency Translation and Level Test,c. Channel Amplitude Frequency Response Test,d. Phase and Jitter Test,e. Voice Frequency Performance Test,f. Degraded Operations Test.

4. OT&E INTEGRATION TESTS AT KEY SITE.

Testing done at the key site is used to verify that the new subsystem can besuccessfully installed and operated at a HAS operation site. These tests were runto evaluate that the LDRCL equ'ipment can suitably and effectively interface withother NAS subsystems.

6

-- - ..,• i.. -. ' .

4.1 FAA-E-2853A TVRTM TESTS (APPENDIX A).

These tests were run by the contractor during Factory Acceptance testing and/orSite Acceptance testing and witnessed by the FAA Technical Center personnel. Thesetests were run to evaluate how well the LDRCL equipment met the LDRCLspecification.

4.2 OPERATIONAL USER'S REQUIREMENT TVRTM TESTS (APPENDIX B).

4.2.1 NAS System Level Tests.

These tests were run to evaluate that the LDRCL equipment can suitably andeffectively interface with other NAS subsystems. Figure 4 is a typical NAS systemlevel block diagram of the test configuration used. The Fireberd provides digitaldata which simulates a user such as a radar. The Modem is a Codex 3600 whichrepresents part of the Data Multiplexing Network (DMN) Subsystem and helps simulatethe necessary connections for the LDRCL subsystem to DMN subsystem interface.

Fireberd Modem VF CHANNEL DSl RADIORS-232 .a BANKmo

VF at DSl at-- Keller -- Keller

ARSR ARSR

RF RF

RADIO DSl CHANNEL VF-,-BANK w-23 dB

at DSl at VF PadKeller KellerRCLR RCLR

FIGURE 4. TYPICAL NAS SYSTEM BLOCK DIAGRAM

The following NAS system level test was run at the key site:

a. AC Power Test (TVRTM test #7).

7


These tests were run to see that the LDRCL subsystem met certain criteriaestablished by the FAA Technical Center in the LDRCL OT&E Integration andOperational Test Plan. See figure 5 for a typical block diagram for asubsystem level test.

Test Set Radio Radio Test Set

System System4 0- at - s-at

Keller KellerARSR RCLR

FIGURE 5. SUBSYSTEM BLOCK DIAGRAM

The following subsystem level tests were run at the key site:

a. Crosstalk (TVRTM test #2),b. Maintainability Test (TVRTM test #4),c. LRU Removal/Replacement Test (TVRTM test #5).

4.3 SYSTEM LEVEL/INTEGRATION MATRIX TESTS (APPENDIX CQ.

4.3.1 NAS System Level Tests.

These tests were run to evaluate that the LDRCL equipment can suitably andeffectively interface with other NAS subsystems. See figure 4 for a typical NASsystem level block diagram of the test configuration used. The Fireberd providesdigital data which simulates a user such as a radar. The Modem is a Codex 3600which represents part of the DMN subsystem and helps simulate the necessaryconnections for the LDRCL subsystem to DtN subsystem interface.

The following NAS system level tests were run at the key site:

a. Modem to LDRCL Test,c. Total Harmonic Distortion Test.


These tests were run to see that the LDRCL subsystem met certain criteriaestablished by the Program Office in the MTP. Figure 5 is a typical block diagramfor a subsystem level test.

S~8

*.i•. -

-7- 7

.

?eT follovig sulbsystem level tests were run at the key site:

a. •nvelope Delay Distortion Test,b. Frequency Translation and Level Test,c. Channel Amplitude Frequency Response Test,d. Phase and Jitter Test,e. Voice Frequency Performance Test,f. Silent Failure Test.

5. TEST RESULTS.

5.1 TEST RESULTS AT THE FAA TECHNICAL CENTER.

5.1-1 Onerational User's Requirements TVRTM Test Results (ARDendix B).

Eleven test requirements are specified in the FAA Master Test Plan OperationalUser's Requirements TVRTM (also contained in appendix B of this document). Out ofthese, seven were requirements to be tested by the FAA Technical Center and fourwere requirements to be tested by the shakedown test team. Out of the seven teststested at the FAA Technical Center, six passed and one failed. The one that faileddoes not affect the operational performance of the radio and is considered a minordeficiency. The test that failed was the EMI/RFI test. The equipment that wasaffected by the radiated field was the alarm monitoring system and this was at avery high field strength which normally would not be encountered in the LDRCLenvironment.

5.1.2 System Level Reauirements Verification Test Results (Arpnendix C).

Eleven test requiyements are listed in the system level/Integration Test Matrixcontained in appendix C of this report. Out of the 11 tests, 8 tests passedcompletely. One of the tests that passed at the FAA Technical Center did fail atthe key site. It was the silent failure test. The system at the FAA TechnicalCenter is not equipped with a battery backup. The system at the key site containsa silent failure associated with the battery system. Three tests that did notcompletely pass the specification, but do not affect the operational performance ofthe system, are considered minor deficiencies. For more details, see the notesassociated with the tests in appendix C.

5-2 OT&E INTEGRATION TEST RESULTS.

5.2.1 FAA-E-2853A TVRTM TEST RESULTS.

Fifty-nine subsystem level test requirements are specified for the LDRCL 23-0Hzdigital radio system (appendix A). Forty-two passed, 8 failed, 8 could not becompletely verified, and 1 was not tested. (See the notes associated with theTYRTM.) The tests that did fail, failed because the equipment selected was NDIequipment which did not entirely meet the LDRCL specifications. The failed testswere considered as noncritical to the actual performance of the radio system andare considered minor deficiencies which do not affect the operational performanceof the radio system.

9

5.2.2 Onerational User's Reouirements TVRTM Test Results.

At the OT&E key site there were 11 Operational User's Requirements Tests(appendix B) which could be performed on the 23-GHz digital radio system. Threerequirements were successfully verified at the key site. Three tests could not beverified at the key site as the system was not connected into the RCL as required.One test, the RFI test, could not be run at the key site as it would interfere withall microwave transmissions in the area, and four tests will be verified duringOT&E Shakedown tests. The tests that could not be performed at the key site, wereperformed at the FAA Technical Center (see section 5.1.)

5.2.3 System Level/Integration Matrix Test Results.

Eleven test requirements are listed in the system level/Integration Test Matrixcontained in appendix C of this report. Out of the 11 tests, 6 tests ppssedcompletely. Three tests did not completely pass the specifications and areconsidered minor deficiencies which do not affect the operational performance ofthe system. One test, the silent failure test, completely failed. This isconsidered a moderate deficiency which needs to be corrected. One test was n-c runat the key site. For more details, see the notes associated with the tests inappendix C.

6. CONCLUSIONS.

6.1 TEST CONCLUSIONS AT THE FAA TECHNICAL CENTER.

6.1.1 Onerational User's Reauirements Test Verification Reguirements TraceabilltyMatrix (TVRTM) Test Conclusions.

Based upon the test results obtained, the conclusion for the requirements thatfailed are as follows:

a. Verify that the Low Density Radio Communications Link (LDRCL) is notaffected by electromagnetic radiation and does not affect other Federal AviationAdministration (FAA) systems with Electromagnic Interference (EMI).

This requirement was not met. The Westronic Alarm System experiencedinterference problems in the presence of a radiated field. This problem is notsatisfactory and should be corrected.

6.1.2 System Level/Integration Test Matrix Test Conclusions.

Based upon the test results obtained, the conclusions for the requirements thatfailed are as follows:

a. Modem to LDRCL Interface Test.

Tests at the FAA Technical Center indicate that when a Codex 3600 modemoperates at speeds of 19,200 and 9,600 bits per second (bps) over 4-wire Earand Mouth (EWI) cards, 4-wire E&M/Extended Range (ER) cards, or Transmission OnlyExtended Range (TO/ER) cards, errors are produced. The Bit Error Rates (BER) arein the range 2E-07 and 2E-08. This is satisfactory.

10

-77

b. Total Harmonic Distortion (THD).

The 1 DS1 system tested in Keller, Texas, without THD filters does not meetthe critical bus criteria contained in Order 6950.2C. The 8 DSl configuration withTHD filters at the FAA Technical Center does meet this requirement. Therefore, itis concluded that to meet the current THD requirement for the critical bus, THDfilters are required. For noncritical AC power bus installations, THD filters arenot required. This is satisfactory.

Both the 1 DS1 system without THD filters and the 8 DS1 system with THDfilters pass specification FAA-G-2100F, Electronic Equipment, General RequirementsSpecification. This is satisfactory for noncritical bus installations.

c. In-rush Current.

The 8 DS1 radio system at the FAA Technical Center does not meet the criticalbus criteria contained in Order 6950.2C. Specifically, it is the time it takes forthe in-rush current to return to 110 percent of the normal value. The requirementis 8 milliseconds (me). LDRCL's value is approximately 350 to 400 ms. This is notsatisfactory for critical alternating current (A/C) bus installations and should becorrected.

The 8 DS1 radio does meet the in-rush requirements contained in specifica-tion FAA-G-2100F, Electronic Equipment, General Requirements Specification. Thisis satisfactory for noncritical bus installations.

6.2 OPERATIONAL TEST AND EVALUATION (OT&E) INTEGRATION TEST CONCLUSIONS.

6.2.1 FAA-E-2853A TVRTM Test Conclusions.

Based upon the test results obtained, the conclusions for the requirements thatfailed are as follows:

a. Specification Paragraph 3.2.1 CGneral. All performance requirementsspecified shall be met when the equipment is assembled into a system in theconfiguration that will be installed for field operation.

This requirement was not met. This nondevelopmental item (NDI) equipment doesnot completely meet all the requirements specified. This is still satisfactory asthe equipment will accomplish its mission in the National Airspace System (NAS).

b. Specification Paragraph 3.2.3, Eauioment Configuration, For a digitalsystem, the failure sensing shall be initiated by the system BER. The thresholdlevel for switching operation shall be adjustable and normally set to operate at aBER of lOE-06.

The equipment does not switch on BER. The equipment switches on the automatedgain control (AGC) voltage level. The switch point is adjustable and can be set toswitch at a level that would approximate a lOE-06 BER which is satisfactory.

c. Specification Paragraph 3.2.4, Radio Freauency Coupler. A radio frequency(RF) coupler shall be provided that will present a minimum of 30 decibel (d0) offorward attenuation to the RF signal for testing purposes.

11

This equipment has a coupler built into the transmit waveguide path. Thiscoupler is a precision 20-dB coupler which is not the 30-dB coupler specified.Since this is NDI equipment and the coupler is only used for monitoring purposes,this is satisfactory. Also, it does not affect the operational performance of theradio.

d. Specification 3.2.8, Receiver/Combiner Switch. The receiver/combinerswitch shall not cause interruptions or transients which may degrade the signal.Level changes due to automatic combiner/switch action shall not cause loss ofdigital data.

The radio was not designed with hitless switching. Therefore, during areceiver or transmitter switch, the radio will experience a loss of data. If thepath analysis is done correctly, this should happen less than 56 minutes per year.This is satisfactory.

e. Specification 3.3.13.5.1, Narrowband Digital Nux Configuration. As anoption, a narrowband digital multiplexing configuration shall be provided which iscapable of multiplexing one DS-1 channel with occupied bandwidth not to exceed1.6 megahertz (MHz).

The radio's bandwidth for one DS-1 radio is 7 MHz, not the 1.6 MHz specified.This means that we may not be able to use this radio in areas that have a congested23-gigahertz (CHz) frequency band. This is acceptable as we still have uses forthe radio in noncongested areas and other LDRCL radios can be used in the area thathave a congested 23-GHz frequency band.

f. Specification Paragraph 3.8.1.1, Battery Protection. A Low Voltage LoadDisconnect (LVLD) unit shall be provided that is capable of removing the batteriesfrom the load when a predetermined cell voltage limit has been reached thuspreventing damage to the battery bank due to excessive cellular discharge (normally1.75 volts per cell). The LVLD shall also be equipped for remote control operationthat permits control via the LDRCL alarm monitoring and control subsystem. Afeature shall be incorporated that alloys local and remote override of the switchfunction. Reset of the switch shall be automatic when the battery complimentrecharges to normal operational voltage.

The automatic reset of switch after the batteries are charged to normaloperating voltages is not incorporated. Switch resets once alternating current(A/C) power is restored to power supplies. This is satisfactory as most NDI radiosystems are designed this way.

g. Specification Paragraph 4.3, System TIsts- The contractor shall conducton the first system of each type ordered, factory system end-to-end performanceacceptance tests, i.e., the tests required to demonstrate to the government thatthe system meets the requirements as specified. The tests shall demonstrate thatall equipment is operating within the normal operating tolerances as stated in theequipment documentation.

The equipment does not meet all the requirements as specified because it isNDI equipment. All the specification requirements that are not met will notaffect the operational performance of the system. For NDI equipment, this issatisfactory.

12

h. Specification Paragraph 4.4, Field SgtmU Tests. When site installationof a microwave system is ordered by the government, the contractor shall conductfield system end-to-end performance acceptance tests, i.e., the tests required todemonstrate to the goverment that the system is installed and operating inaccordance with the requirements as specified. The tests shall demonstrate thatall equipment is operating within the normal operating tolerances as stated in theequipment documentation.

The equipment does not meet all the requirements as specified because it isNDI equipment. All the specification requirements that are not met will notaffect the operational performance of the system. For NDI equipment, this issatisfactory.

6.2.2 Onerational User's Reauirements TVRTM Test Conclusions.

All the tests that could be tested at the key site were successfully completed.For additional conclusions on testing associated with this matrix, see section6.1.1.

6.2.3 System Level/Integration Matrix Test Conclusions.

All testing associated with this matrix was successfully completed with theexception of the silent failure test. This test- was not successfully completed andadditional work is necessary to correct the problem encountered during this test.

7. RECQHM =TIONS.

Based on all test results, it is recommended that the 23-gegahertz (CGz) LowDensity Radio Communications Link (LDRCL) digital radio system be deployed at thistime under the following conditions:

a. The following two items have not been tested and may not be deployed until

successful Operational Test and Evaluation (OT&E) testing has been performed.

1. Seismic Rack

2. 4-Wire Ear and Mouth (E&M)/Private Line Automatic Ringdown(PIAR)/Extended Range (ER) voice card

b. A ferrite or Radio Frequency Interference (RFI) filtering will be added tothe Westronic WS2000 alarm system input power lines during site installation asindicated in a memo sent to the Federal Aviation Administration (FAA) TechncialCenter by the program office.

c. A switch or some kind of sensing circuit will be added to the Low VoltageBattery Disconnect relay to indicate when the relay has failed.

13

d. For critical alternating current (A/C) power bus installations, TotalHarmonic Distortion (THD) filters will be installed and a waiver must be grantedthat releases LDRCL from the requirement that the duration of the in-rush currentshall not exceed 8 milliseconds (as). (Return to 110 percent of its normal value.)LDRCL exceeds this requirement. For noncritical AC power bus installations, THDfilters are n=a required but the installation of the filters would be beneficial toother equipment connected to the bus. The regions can decide for themselves ifthey want to install THD filters at these locations.

8. ACRONYMS AND ABBREVIATIONS.

A/C alternating currentACC Automatic Gain ControlARSR Air Route Surveillance RadarARTCC Air Route Traffic Control CenterASR Airport Surveillance RadarATCT Air Traffic Control TowerBER Bit Error Ratebps bits per secondCOTS Commercial Off-the-ShelfdB DecibelDMN Data Multiplexing NetworkF&M Ear and MouthECP Engineering Change ProposalEMI Electromagnetic InterferenceER Extended RangeFAA Federal Aviation AdministrationGHz gigahertzLDRCL Low Density Radio Communications LinkLRU Line Replaceable UnitLVBD Low Voltage Battery DisconnectLVLD Low Voltage Load DisconnectM&z megahertzas millisecondMTP Master Test PlanNAS National Airspace SystemNDI Nondevelopmental ItemOT&E Operational Test and EvaluationPCP Power Conversion ProductsPLAR Private Line Automatic RingdownRCAG Remote Air to GroundRCL Radio Communications LinkRCIE Radio Communications Link RepeaterRF Radio FrequencyRM Radio Frequency InterferenceTIMS Transmission Impairment Measurement SetTHD Total Harmonic DistortionTO/ER Transmission Only Extended RangeTOR Technical Onsite RepresentativeTRACON Terminal Radar Approach ControlTVRTM Test Verification Requirements Traceability Matrix

14

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APPENDIX A

FMA-E -2853A

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OPERATIONAL USER' S REQUIREMENTSTEST VERIFICATION REQUIREMENTS TRACEABILITY MATRIX (TVRTM)

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