prod bulletin ip phone 1535 phase 2 p-2007-0266-global v1 0

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Product Bulletin Bulletin Number: P-2007-0266-Global Date: 28 November 2007

IP Phone 1535 Phase 2 General Availability – Global

REVISION HISTORY

Date Revision # Summary of Changes 28 November 2007 Initial publication Initial publication

Introduction The purpose of this bulletin is to introduce the Nortel IP Phone 1535 Phase 2, effective November 28, 2007. The IP Phone 1535 is a videophone that is compatible with the Multimedia Communications Server 5100 Release 3.5 and 4.0. The initial GA offering of the IP Phone 1535 Phase 2 firmware is Release 00.02.50. This bulletin provides useful information including solution overview, firmware management and ordering information. It also references Product Advisements as well as where to find related documentation and product information.

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IP Phone 1535 Overview Nortel’s IP Phone 1535 introduces an advanced desktop IP videophone for Enterprises or organizations looking for a cost-effective personal video endpoint. Key features include an integrated color video camera coupled with a high-resolution, pixel-based, color display. The IP Phone 1535 also incorporates a web browser along with POP3-based or IMAP-based e-mail client and supports personalization such as customized ring tones and backgrounds. In addition to the Ethernet 10/100 interface, the IP Phone 1535 contains an integrated IEEE 802.11b/g ‘Wi-Fi’ radio. This Wi-Fi connectivity option provides a high degree of flexibility as to the physical location of the device and can also reduce infrastructure costs by reducing the need for Ethernet cabling to the telephony endpoint device. Initial support for the IP Phone 1535 is with MCS 5100. For support plans with future releases of MCS 5100 and other Nortel Communication Servers, please contact your Nortel Account representative. For detailed product and feature information, please refer to the information on the IP Phones and Clients product page of the Partner Information Center (PIC) or on www.nortel.com. The PIC can be accessed at: http://www.nortel.com/prd/picinfo/index.html. Once logged into the PIC, click on Products, then VoIP, Voice & Multimedia Communications and finally IP Phones & Clients.

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320x240 TFT Color tilt-able LCD Display with Backlight

Two Context-Sensitive Soft-keys

Navigation cluster

Camera Button

Left Click/Right Click

End/Goodbye

Messages/Inbox

Handsfree/ Off Hook

Video Window Size

Directory/Favorites

Video Call

Stop Video

Integrated Video Camera

Handset

IP Phone 1535 features

Display

> Integrated video conferencing > Integrated web browser > Calendar with alarms > Email Client

• SMTP/POP/IMAP • Receive/Send/Forward/CC

> Ringing Options • Up to 50 Polyphonic Ringtones

• Ability to add more from SD/MMC card

• DND mode • Ring on VIP calls only

> Video Display Options • Remote/local small • Remote large/local small

> Galleries • Up to 20 images

• Ability to add more from SD/MMC card

• Up to 20 audio sounds • Ability to add more from

SD/MMC card

> Language Support • English German • French Portuguese • Spanish Korean

> T9 Alpha-Numeric Entry Keypad > Phonebook

• Up to 300 contacts

> Call History (last 20 items) • Missed calls

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The IP Phone 1535 incorporates a high resolution 3.5” TFT backlit color display consisting of 320x240 pixels. Up to 65k colors can be displayed. The display is adjustable to allow the camera to be set in an optimal position for video conferencing. The backlight adds appeal to the overall industrial design, and provides better usability in some lighting conditions. The backlight can be set to go off at different time intervals and can also be set to stay on 7/24. The end user experience is enhanced with the new displays since the phones are able to support easy to read pre-defined fonts and the entire display can be used to present web-based applications and graphical information to the user. Support for alternate languages including Asian fonts requires additional IP Phone firmware intended to be available in the future through software upgrades. Camera The integrated ¼” VGA CMOS video camera provides a resolution of 300k pixels. The camera can be used to capture either still images or full motion (30fps) video.

Connectivity Connectivity to a local area network is via an internal 10/100 Ethernet interface. The IP Phone 1535 provides a single LAN interface through an RJ-45 connection. Note that Power over Ethernet (PoE) is not supported. Connecting the IP Phone 1535 to a network which supplies PoE will not harm the device. The IP Phone 1535 also employs an IEEE 802.11b/g ‘WiFi’ interface. This provides flexibility in the physical location of the device, limited only by coverage to the nearest access point. Both 802.11b (11mb/s) and 802.11g (54mb/s) are supported along with WEP (64 and 128 bit), WPA, WPA-PSK, WPA2 and WPA2-PSK encryption and authentication protocols. The IP Phone 1535 does not contain a headset jack.

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Memory Expansion The IP Phone 1535 provides slots for both a Subscriber Identity Module (SIM) card and a Secure Digital Multimedia Card (SD/MMC). Use the SIM card to import or export contact information, the SD/MMC card to import or export multimedia content.

Integrated Web Browser The IP Phone 1535 contains an integrated web browser. Coupled with the 4-way navigation keys and left/right click buttons, users may navigate a number of web services directly from the phone. Text entry may be either via the T9 or double-tap method. Web pages may contain HTML and JavaScript (except Windows objects) and may be up to 10MB large. The IP Phone 1535 does not support pages containing XHTML, PDF/Flash, Video, Audio/MIDI or ActiveX content at this time.

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New Features Introduced in Phase 2 Universal Power Supply. A universal power supply facilitates powering of the IP Phone 1535 from different sources in global markets. The power supply operates on 100-240v ac, 50-60Hz and incorporates an IEC 620 connector to allow the use of country-specific power cords. The power cord is automatically provisioned via the Enterprise Configurator (EC) at the time the phone is ordered. Multiple date/time formats. Both 12 and 24 hour time formats are now supported as well as dates in the following formats:

o YYYY/MM/DD o MM/DD/YYYY o DD/MM/YYYY

Expanded Language Support. Phase 1 provided support for English, French and Spanish. Phase 2 adds Korean, LA Spanish, German and Portuguese. MCS 5100 Release 4.0 Support Including Geographic redundancy. Release 3.5 will continue to be supported Video Enhancements and Standards Support

• Video Fast Update (VFU) Support. Generates Intra-Frames upon request enabling switched video in multiparty video conferencing server environments.

• Support for RFC3984 (packetization-mode 0). Corrects an issue with H.264 SDP negotiation providing interoperability with other video devices using H.264.

• Interoperability with TANDBERG Video Systems. This includes infrastructure devices such as the Tandberg Media Processing System (MPS) as well as SIP Video Conferencing Endpoints such as the Tandberg MXP Video Conferencing Systems Family. Note: Only H.263 video codecs are supported when interoperating with Tandberg devices. H.264 support will require a Tandberg software upgrade: MXP (F + L SW) and MPS (J SW), available Q1 2008.

• TIA/EIA-810-A compliance (Handset) Additional Client Features, including:

• STUN support for NAT firewall traversal • SIP Username Registration • 301, 302 Registration Redirection

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• Picture Caller ID Support, based on MCS Personal Agent database • Standardized Ring Patterns • Enhanced DISPLAY NAME support (for Caller ID and Call Logs) • Server hosted (MAS based) ad-hoc conferencing • Call decline options:

o 486 busy here – decline the call only on this phone. o 603 decline – decline the call on this phone as well as all the other phones

with the same user name. Improved Security and Services including:

• Support for WPA2 (IEEE 802.11i) authentication over WiFi. This provides increased over-the-air security using AES, a stronger form of encryption than TKIP used in WPA. WPA will continue to be supported in Phase 2 as well.

• SIP Protocol Stack Robustness • Remote provisioning of general parameters on each phone including:

o Domain Name o SIP Proxy Address o Codec Preferences o FTP Server Address o Ring Tone Files

• Support for DHCP Option 66 to allow automatic loading of ftp configuration/upgrade server address to phone.

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Nortel Communication Server Support The IP Phone 1535 is only supported on the Nortel MCS 5100 and delivers call server telephony features similar to that of the IP Phone 2004. Nortel server support includes:

• Multimedia Communication Server 5100 Release 3.5 or later Plans to support additional Nortel Communication Servers are under formulation at this time. Consult your Nortel representative for further timeline updates for servers of interest.

Administration and Provisioning The IP Phone 1535 must be provisioned on the MCS 5100 as a SIP video endpoint.

Firmware Content and Upgrade Information The IP Phone 1535 supports remote firmware upgrades through both a manual and automated process. Note that upgrades must be applied in sequence as each firmware load only contains the changes from the previous load. This means that if a device is running firmware release A and newer versions B and C are available, upgrading directly from A to C would not apply the changes in release B. The IP Phone 1535 Phase 2 CA/GA firmware release is version 0.2.50. Phase 1 sets currently running firmware release 0.1.70 may be upgraded to the 0.2.50 release directly without any intermediate upgrade steps. The following link to the Technical Support Portal should be used to access the latest firmware loads available for the IP Phone 1535. http://www130.nortelnetworks.com/go/main.jsp?cscat=OVERVIEW&resetFilter=1&poid=17201

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FTP Server Structure IP Phone 1535 performs firmware upgrades via the FTP protocol. This requires that an FTP server be provisioned on the network containing each of the firmware versions. The core part of server set up is the directory structure. FTP server directory structure

1. root(/): the root of the FTP server when IP Phone 1535 connects to server with id “ipphone” and password “15354all”.

2. 1.0: directory name follows hardware version. 3. 0.1.12, 0.1.13: directory name follows the firmware version.

Firmware upgrade structure

1. The firmware upgrade files are located in the firmware version directory. (e.g. 0.1.12, 0.1.12 from the example above)

2. The firmware upgrade has three different file types.

A. tar, tar2, tar3: firmware upgrade files B. filecheck: checksum for all the firmware upgrade files C. FirmwareUpdateRequest.acfg: contains hardware and software version

number for the firmware, and a list of firmware upgrade files. e.g. FirmwareUpdateRequest.acfg firmware-update: 0.1.53 1.0/0.1.53 filecheck Configuration-0.1.53.tar App-0.1.53.tar App2-0.1.53.tar

• 1.0/0.1.53: hardware and firmware version number for the new firmware

• filecheck: checksum for all the firmware upgrade files • Configuration-0.1.53.tar App-0.1.53.tar App2-0.1.53.tar: list of

firmware upgrade files

FirmwareUpdateRequest.acfg

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1. The FirmwareUpdateRequest.acfg is the most important file out of all the files in

the directory. A. The server manager must copy the new “FirmwareUpdateRequest.acfg” file

from the new firmware to the directory of the previous version. B. The IP Phone 1535 will compare its current version with version number in

the “FirmwareUpdateRequest.acfg”. If the current version is different from the version number in FirmwareUpdateRequest.acfg”, a firmware upgrade will start from the new version directory specified in new ”FirmwareUpdateRequest.acfg”.

C. Firmware upgrades are one-directional. (i.e. IP Phone 1535 cannot downgrade). 1) If the current version is 0.1.1 and the version number in new

“FirmwareUpdateRequest.acfg” located in “0.1.1” directory is 0.1.2, then IP Phone 1535 upgrades from 0.1.1 to 0.1.2 only.

2) If there are three new firmware versions, 0.1.1, 0.1.2, and 0.1.3, the firmware upgrade starting from 0.1.1 repeats twice, from 0.1.1 to 0.1.2, then 0.1.2 to 0.1.3. Upgrade directly from 0.1.1 to 0.1.3 is not possible.

2. If a directory contains “FirmwareUpdateRequest.acfg” file with the same version number as its directory name, this directory is the final version of software upgrade. Whereas, if the directory contains “FirmwareUpdateRequest.acfg” file with the different version number from its directory name, IP Phone 1535 upgrades to next version.

Firmware upgrade availability

The FTP server must contain all firmware upgrades. Regardless of the version number of the phone, all the phones will upgrade to the final version, repeating upgrade operation in sequence.

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Note: The name format of the upgrade firmware is “IP_Phone_1535_fw_[new version number]_FTP_image.zip”. Previous version number is not specified in the name of the upgrade firmware, and FTP server manager may copy the “FirmwareUpdateRequest.acfg” file to wrong directory. Change in the name format of the upgrade firmware: both previous and new version number must be specified in the name so that server manager knows the location of the previous version in order to copy new “FirmwareUpdateRequest.acfg”.

Firmware Upgrade Process

The FTP download and upgrading of the phone’s Flash memory takes a while. Please be patient, do not unplug/reboot the phone during the process!

• Approximately, the FTP file transfer takes about 5 seconds, followed by another 2 minutes to burn the file into the Flash memory. (It’s time may change because of new FW’s size)

• During that time the phone displays the progress bar and the install message. • When finished writing the new FW, the phone displays “[FW] finished”, reboots, and comes

up running the new FW version. There are three methods for the upgrade that can be used:

Method 1: Automatic FTP Download at Bootup Procedure Method 2: Manual FTP Download in MENU. Method 3: Manual upgrade with SD/MMC Card removed from 0.1.53

Each is covered in one of the following sections. Method 1: Automatic FTP Download at Bootup Procedure On bootup, the phone will check if a FW upgrade is available. The “FirmwareUpdateRequest.acfg” file is downloaded and the Name of download files and Version information processed. The Version field is compared to the phone’s current FW version string. If the phone’s current FW version string is older than Download Version field sting, FTP Download will be started. The progress bar and install message are displayed in Download Process. After Automatic FTP Download, the phone will be rebooted.

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And the phone checks if a FW upgrade is available. FTP Download process will be repeated until available FW does not exist.

Method 2: Manual FTP Download in MENU The Manual FTP Download is available under the Technical Features section from the MENU. The upgrade process is same to Automatic FTP Download. Manual FTP Download function is two kinds. “Check update” will first check if the version is current, and, if not, will prompt the user to start the upgrade process. “Update software” will perform the version check and will start the FW upgrade automatically without user input. Note: The FTP Server IP address is configured in the “Download server address” of MENU.

Remote Provisioning

You can check and/or download the latest software via MENU > Settings > Technical features.

IMPORTANT: You must log in as Admin in order to access Check updates / Update software and Change to Download server address.

New software release must be ready on the designated FTP server for a successful software upgrade.

Figure 26. Technical features

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IP Phone 1535 Phase 2 introduces the ability to remotely provision certain elements of the phone configuration. Automatic configuration is based on DHCP and is independent of the firmware download procedure. The IP Phone1535 automatic configuration involves two key components: DHCP option 66 and a common configuration file. If DHCP is enabled on the phone, it will connect to the DHCP server. When the IP Phone1535 detects that Option 66 is configured, it will use the address to download the configuration file. The format of DHCP Option 66 parameter is as follows:

ftp://ipphone:[email protected]/1.0/1535_Ph2_common_config.cfg

It is responsibility of the system administrator to configure the DHCP server to support Option 66. The IP Phone 1535 Phase 2 only supports the ftp protocol for remote configuration files. The Vendor ID of the IP Phone1535 is “Nortel-IP1535-1.0”. By this value, you can configure the DHCP server to respond uniquely to the 1535 with its unique Option 66 string. If the same server is used for both firmware updates and common configuration files, it is recommended to use same id, and password with firmware download account. And locate common config file under directory 1.0, is recommended. Sharing server is not mandatory. The Common Configuration file contains following configuration items. The phone will detect changes in the configuration file and update its internal configuration. Localized tone plans such as dial tone, busy tone and congestion tone may be configured as well. Recommendation is to share download account (ipphone) and locate under 1.0/tone/ Example Common Configuration File:

DOMAIN=emsalpha.com AUDIO_CODEC=0:1:3:2:5:11 VIDEO_CODEC=7:10:11:11:11:11 PROXY_ADDR=47.11.232.188 EXPIRES=86200 PROXY_PORT=5060 FTPSERVER=47.11.208.121 DIAL_TONE=ftp://ipphone:[email protected]/1.0/tone/dialtone.wav RINGB_TONE= ftp://ipphone:[email protected]/1.0/tone/ringbtone.wav BUSY_TONE=ftp://ipphone:[email protected]/1.0/tone/busytone.wav FBUSY_TONE= ftp://ipphone:[email protected]/1.0/tone/fbusytone.wav CONG_TONE=ftp://ipphone:[email protected]/1.0/tone/congtone.wav

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The codecs are listed in priority with the highest one first and coded as per RFC 1890 Table 2. The sequence of remote provisioning steps is depicted below:

1535 Ph2 DHCP

Server

FTP Server

Get IP with option 66

Get common config file

Get common tone files

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Ordering Guidelines and Procedures The product codes for the IP Phone 1535 listed below are Generally Available and shipping effective November 28, 2007. Nortel Order Management will accept an order for any codes listed in this product bulletin. Ordering information for the 1535 is shown below. The IP Phone 1535 phone model includes a power supply unit.

PEC Description

NTEX02AAE6 IP Phone 1535 with North American power supply (Phase 1) NTEX02BAE6 IP Phone 1535 Phase 2 with Universal power supply (Phase 2)

The IP Phone 1535 offering includes the following components in the box:

• IP Phone 1535 • Handset • Handset Cord • Phone desktop stand • Ethernet cable • Local power supply • Getting Started Card

The IP Phone 1535 Phase 2 is packaged with a global power supply and does not include a power cord. The appropriate power cord must be provisioned separately based on the region and country. The Nortel Enterprise Configurator (EC) will automatically provision one of the following power cords based on the ASL in the CGPPR data base for region and country.

PEC VPEC Description

NTTK14AB (non RoHS) NTTK14A_B PCORD_NA NTTK14ABE6 (RoHS) NTTK14A_B PCORD_NA NTYS14AAE6 (RoHS) NTYS14A_A PCORD_NG

NTYS14AA (non RoHS) NTYS14A_A PCORD_NG

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NTTK16ABE6 (RoHS) NTTK16A_B PCORD_EURO

NTTK16AB (non RoHS) NTTK16A_B PCORD_EURO

NTTK17ABE6 (RoHS) NTTK17A_B PCORD_CH

NTTK17AB (non RoHS) NTTK17A_B PCORD_CH

NTTK22ABE6 (RoHS) NTTK22A_B PCORD_DK

NTTK22AB (non RoHS) NTTK22A_B PCORD_DK

NTTK18ABE6 (RoHS) NTTK18A_B PCORD_UK

NTTK18AB (non RoHS) NTTK18A_B PCORD_UK

A0814961 Argentina A081496_1 PCORD_AR

NTTK15AA Australia and New Zealand

NTTK15A PCORD_ANZ

Approved Countries The IP Phone 1535 meets all of the regulatory requirements and has been approved for sale in the following countries: North America:

• US, Canada EMEA:

• EU Member states approved: Austria, Belgium, Czech Republic, Cyprus, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, The Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, United Kingdom

• Non-EU states approved: Iceland, Lichtenstein, Norway, Switzerland

• Pending: Russia, Ukraine, Belarus – Approvals expected to be completed Jan 2008

Asia-Pacific: • India, Thailand, Indonesia, Singapore • Not approved:

Japan, Australia, New Zealand • Pending:

Korea – Approvals expected to be completed Nov 2007

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Greater China • China, Taiwan, Hong Kong

CALA

• Cayman Islands, Aruba, Barbados, Bermuda, Bolivia, Dominican Republic, Panama, Honduras, Brazil, Mexico, Trinidad & Tobago, Peru

• Pending: Argentina – Approvals expected to be completed Jan 2008

MCS 5100 Port License The IP Phone 1535 is a SIP-based client that works with Multimedia Communication Server 5100 (MCS 5100) Release 3.5 systems. As such, a SIP port license is required for the IP Phone 1535 to connect to the MCS 5100 system. When placing an order for the IP Phone 1535, please ensure appropriate number of MCS 5100 SIP port licenses have been ordered to support the application.

References and Related Documents Beta trial participants and supporters are encouraged to access to more information and related documents on the IP Phone 1535 which can be found on the Nortel Technical Support Portal at the following link: http://www130.nortelnetworks.com/go/main.jsp?cscat=OVERVIEW&resetFilter=1&poid=17201 Scroll down to the bottom to "Pre-Release". At this link you can access the following documents:

• NN43160-101 IP Phone 1535 User Guide • NN43160-102 IP Phone 1535 Quick Reference Card • NN43160-104 IP Phone 1535 Getting Started Guide (In-box documentation) • NN43160-300 Nortel IP Phone 1535 Installation and Commissioning Guide • NN43160-400 IP Phone 1535 New in this Release

The product page on Partner Information Center (PIC) will be located at: TBD

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Training The following training courses have been updated to include the IP Phone 1535:

o 6313C MCS 5100 R 4.0 Installation and Commissioning o 6314C MCS 5100 R 4.0 Engineering and Planning o 6316C MCS 5100 Administration

More information is available on the Nortel Training and Certification page at https://app97.nortelnetworks.com/cgi-bin/teds/cs/maintc.jsp?level=1&category=9&subcategory=&subtype=&viewOptSelect=9||&poid=12482&pageClicked=1&startItem=25 Further details on course offerings and schedules can be obtained from the Global Knowledge website at http://www.globalknowledge.com/

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Technical Advisements

Power Supply Note that the global power supply for the IP Phone 1535 Phase 2 is similar in appearance to the power supply used for IP Phone 200x and 1100 series phones. Due to the differences in voltage, do not use any other power supply other than the one provided with the IP Phone 1535 or serious damage may result.

Power Over Ethernet Support Standards-based IEEE 802.3af Power over Ethernet (PoE) is not supported on the IP Phone 1535. The provided power supply must be used to locally power the unit. If the IP Phone 1535 is connected to an infrastructure that provides IEEE 802.3af PoE, the unit will only receive the data connectivity.

IP address conflict detection If the IP address is setup manually, the IP Phone 1535 will not perform ARP checking to determine if the IP address is already used on the same network prior to activation. This means that the IP address will be activated and may conflict with (and impact the operation of) another device. The IP Phone 1535 will however detect the conflict after three minutes and inform user with a notification message.

Operation on VLANs The IP Phone 1535 Phase 2 software supports IEEE 802.1q tagging for Virtual Local Area Networks (VLANs), however, the following limitations must be noted: 1. Only TAGGED VLAN ports are supported while UNTAGGED ports are not. A tagged

port means all egress and ingress packets passing through the port are tagged, untagged ingress packets are discarded. In this case, the IP Phone 1535 only expects to receive tagged packets. Untagged ports means ingress packets can be either tagged or untagged but all egress packets must be untagged. In this case, the IP Phone 1535 only expects to receive untagged packets.

2. The IP Phone 1535 hardware limits incoming packets to a maximum of 1500 bytes. Under certain conditions in VLAN-enabled networks, packets may exceed this threshold and be discarded by the phone. A bulletin detailing these conditions as well as the configuration changes required on the MCS 5100 system will be forthcoming.

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G.723 Interop Users may notice a delayed call setup time (650ms) with calls using the G.723 codec. (Q01467916).

Security Vulnerabilities The IP Phone 1535 has been tested with a suite of tools to simulate security threats from the network. Most of the issues identified in Phase 1 have been addressed in the Phase 2 firmware. While no serious issues remain, a couple of exposures exist as listed below. These will be addressed in a future release.

• It is possible for RTP voice messages to be intercepted using an ARP poisoning tool. (Q01436388)

• Running the Cain and Abel ARP poisoning tool, it is possible to access the default ftp account without a password.

Alarm Settings Any alarms which have been programmed will be cleared if the phone is rebooted. (Q01451176).

CallPilot Manual Access If a 1535 user manually dials call pilot DN and then presses #, the 1535 will send the mailbox ID and password digits as configured in the mailbox setup. With other Nortel IP phones, when the user presses '#', the other sets only send the '#'. This means that 1535 users may experience issues accessing CallPilot if they have changed their password and have not updated the 1535 Voicemail configuration. (Q01461513)

SD/MMC Card Operation Users are advised to not remove the SD/MMC card until the process has been completed when copying data to or from the card. (Q01454069)

LAN Speed Negotiation Both the phone and port must be either both setup as Auto or manual with same speed. Configurations where one side is set to automatic and the other to manual is not supported. The IP Phone 1535 only supports auto-negotiation; hence the switch port MUST also be set for auto-negotiation. (Q01472475)

Korean Language Selection When the Korean language is selected, the IP Phone 1535 the set will automatically reset and, as a side effect, re-register with the switch. No extra user actions are required. (Q01661309)

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Single User Login The IP Phone 1535 only supports a single user logged in per phone. Other Nortel IP phones allow for more than one user to be logged in at a time.

Single Ethernet Interface The IP Phone 1535 incorporates a single Ethernet LAN interface. If the IP Phone 1535 is to be co-located with a PC, either an Ethernet hub must be used or a separate Ethernet connection provided.

TIA-810-A Compliance While the IP Phone 1535 provides high quality audio, it does not meet the requirements for TIA-810-A audio standard. (Q10466365)

CBTW value and System Reset Note that if the phone is reset using the “system reset” function (Settings>System Setting>Reset), the value of CTBW will be changed to 160 (from the default value of 250).

*Nortel, the Nortel logo and the Globemark are trademarks of Nortel. The first mention of any Nortel trademark in the text should have an asterisk placed after it. Nortel is a recognized leader in delivering communications capabilities that enhance the human experience, ignite and power global commerce, and secure and protect the world’s most critical information. Serving both service provider and enterprise customers, Nortel delivers innovative technology solutions encompassing end-to-end broadband, Voice over IP, multimedia services and applications, and wireless broadband designed to help people solve the world’s greatest challenges. Nortel does business in more than 150 countries. For more information, visit Nortel on the Web at www.nortel.com.