Nortel CMTS 1000, CMTS 1000 V2.1 Release Note

305472-B Rev 02
July 1999

Version 2.1

Release Notes for the
CMTS 1000 V2.1

Radio Frequency Interference Statement

NOTE:

This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable pro­tection against harmful interference when the equipment is operated in a commercial environment.
This equipment generates, uses, and can radiate radio frequency energy and, if not installed and
used in accordance with the instruction manual, may cause harmful interference to radio communi­cations. Operation of this equipment in a residential area is likely to cause harmful interference in
which cause the user will be required to correct the interference at his own expense.

This digital apparatus does not exceed the Class A limits for radio noise emissions from digital
apparatus set out in the Radio Interference Regulations of the Canadian Department of Communi­cations

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applica­bles aux appareils numériques de classe A prèscrite dans le Règlement sur le brouillage
radioélectrique édict par le Ministère des Communications du Canada.

To maintain compliance with FCC radio frequency emission limits the use of quadshield, RG-6/U
type CA TV cable is required for connection to the CA TV system. Any changes or modifications may
void the user's authority to operate this equipment.

EN 55 022 Statement

This is to certify that Nortel Networks CMTS is shielded against the generation of radio interfer­ence in accordance with the application of Council Directive 89/336/EEC, Article 4a. Conformity is
declared by the application of EN 55 022 Class A (CISPR 22).

Voluntary Control Council for Interference (VCCI) Statement

This is a Class A product based on the standard of the Voluntary Control Council for Interference
from Information Technology Equipment (VCCI). If this is used near a radio or television receiver
in a domestic environment, it may cause radio interference. Install and use the equipment accord­ing to the instruction manual.

Règlement sur le brouillage radioélectrique du ministère des Communications

Cet appareil numérique CMTS respecte les limites de bruits radioélectriques visant les appareils
numériques de Classe A prescrites dans le Règlement sur le brouillage radioélectrique du Min­istère des Communications du Canada.

EC Declaration of Conformity

This product conforms to the provisions of Council Directive 89/336/EEC and 73/23/EEC.

Nortel Networ ks
8 Federal Street

Billerica, MA 01821

305472-B Rev 02 iii

Copyright © 1999 Nortel Networks

All rights reserved. Printed in the USA. July 1999.
The information in this document is subject to change without notice. The statements, configurations, technical data,

and recommendations in this document are believed to be accurate and reli able, but are presented without express or
implied warranty. Users mu st tak e fu ll resp on sibil ity for their applications o f a n y p r oduc ts spe ci f ie d in th is do c ume nt .
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The software described in this document is furnished under a li cense agreement and may only be used in accordance
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Release Notes for the CMTS 1000 V2.1

iv 305472-B Rev 02

UNDER WHICH NORTEL NETWORKS WILL PERMIT YOU TO USE THE SOFTWARE. If you do not accept
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Release Notes for the CMTS 1000 V2.1

305472-B Rev 02 v

SHALL THE LIABILITY OF NORTEL NETWORKS RELATING TO THE SOFTWARE OR THIS AGREEMENT
EXCEED THE PRICE PAID TO NORTEL NETWORKS FOR THE SOFTWARE LICENSE.

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Release Notes for the CMTS 1000 V2.1

vi 305472-B Rev 02

Table of Conten ts

305472-B Rev 02 vii

About This Document

BEFORE YOU BEGIN ...................................................................................................... ix

IMPORTANT NOTICE ....................................................................................................... x

Customer Service ............................................................................................................. xi

How to Get Help ............................................................................................................... xi

Conventions Used in This Document ...............................................................................xii

Acronyms ........................... .......................... .......................... ......................... .................xiii

Technical Publications .....................................................................................................xiv

Associated Documents ....................................................................................................xiv

Release Notes for the CMTS 1000 V2.1

Product Description ........................................................................................................1-1

Restrictions ........... ....................................... ...................................... ............................. 1-1

Preinstallation Configuration ...........................................................................................1-2

Settings ....................................................................................................................1-2

Emulation .................................................................................................................1-2

Miscellaneous ..........................................................................................................1-2

Upgrade Recommendations ...........................................................................................1-3

Upgrade Procedure Summary .................................................................................1-3

New Features .................................................................................................................1-6

Software Upgrade Integrity Check ...........................................................................1-6

Baseline Privacy .......................................................................................................1-6

Log Messages ..........................................................................................................1-6

Problems Fixed ...............................................................................................................1-7

Anomalies ............. ............................................. ............................................. ................ 1-8

Release Notes for the CMTS 1000 V2.1

viii 305472-B Rev 02

305472-B Rev 02 ix

About This Document

Product: Software V2.1
Date: July 1999
Distribution: External
Software Version: V2.1

BEFORE YOU BEGIN

Before using this document, you should be familiar with RF measuring
equipment, data over cable CATV system installation procedures, Cable
Modem Provisioning Server, and general RF cable plant operating meth­ods. You should also be familiar with how to use an SNMP manager.

Release Notes for the CMTS 1000 V2.1

x 305472-B Rev 02

IMPORTANT NOTICE

Arris Interactive received CableLabs DOCSIS Qualification for the CMTS 1000 in
July 1999. The CMTS 1000 that was Qualified was tested using Software Release 2.0.

Since that time, Arris Interactive has released Software Release 2.1. Arris will
continue to ship CMTS 1000's with S/W 2.0 installed (the Qualified configuration)
and will include 2.1 on a CD with the shipment.

Arris encourages the use of Software Release 2.1. This release provides the following
features and addresses some existing issues in the 2.0 code.

Performance

Arris has tuned the performance of the CMTS 1000. Users will benefit from a 40%
performance improvement with using Software Release 2.1.

Added Features

- The CMTS 1000 with S/W 2.1 will support 1024 bit modular RSA keys.

- More detail is provided in the event log for CM registration request rejections.

- The CMTS 1000 will now accept configuration files of up to 8K in size.

Issues Addressed

- The CMTS 1000 has been made more robust in the face of:

- corrupted extended headers from rogue cable modems.

- cable modems attempting to register without a modem IP address TLV.

- Several minor issues in the Ingress Avoidance implementation have been
repaired.

- The CMTS, when running 100MB Full Duplex, was not incrementing the
Ethernet Collision and Carrier Sense Error counters correctly; S/W 2.1 corrects
this deficiency.

- The CLI command ping-llc would crash the CMTS due to an alignment error;
this has been repaired.

Arris encourages the use of Software Release 2.1 so that customers can benefit from
the improved performance, robustness, and feature set of the CMTS 1000.

About This Document

305472-B Rev 02 xi

CUSTOMER SERVICE

You can purchase a support contract from your Nortel Networks distributor
or authorized reseller, or directly from Nortel Networks Services. For
information about, or to purchase a Nortel Networks service contract,
either call your local Nortel Networks field sales office or one of the fol­lowing numbers:

Information about customer service is also available on the World Wide
Web at support.baynetworks.com.

HOW TO GET HELP

If you purchased a service contract for your Nortel Networks product from
a distributor or authorized reseller, contact the technical support staff for
that distributor or reseller for assistance.

If you purchased a Nortel Networks service program, call one of the fol­lowing Nortel Networks Technical Solutions Centers:

Support Center

Telephone

Number

Fax

Number

Email

Andover, MA 800-2LANWAN*

(978-916-3700)

978-682-3200
Attn: Support
Contracts

[e-mail]

Valbonne,
France

33-4-92-96-69-68 33-4-92-96-69-98 baypoint@baynetworks.

com

Release Notes for the CMTS 1000 V2.1

xii 305472-B Rev 02

* For cable modems and cable modem family products, use Express Rout-

ing Code 174.

CONVENTIONS USED IN THIS DOCUMENT

Italic text

Indicates text that you need to enter, command names,
and buttons in menu paths.
Example: Enter

wfsm &

Example: Use the

dinfo

command.

screen text Indicates data that appears on the screen.

Example:

Set cable-level#

Region

Telephone

number

Fax number Email

United States
and Canada

800-2LANWAN*
(978-916-3700)

978-682-3200
Attn: Support
Contracts

[e-mail]

Europe 33-4-92-96-69-68 33-4-92-96-69-98

About This Document

305472-B Rev 02 xiii

ACRONYMS

ARP Address Resolution Protocol
CATV Community Access (Antenna) TV
CLI Command Line Interface
CM Cable Modem
CMTS Cable Modem Termination System
COM Communications Port
DHCP Dynamic Host Configuration Protocol
DOCSIS Data Over Cable Service Interface Specification
FTP File Transfer Protocol
IGMP Internet Group Management Protocol
IP Internet Protocol
LF Line Feed
LLC Logical Link Control
MAC Media Access Control
MIB Management Information Base
QAM Quadrature Amplitude Modulation
QPSK Quadrature Phase Shift Keying
RF Radio Frequency
SNMP Simple Network Management Protocol
SOHO Small Office/Home Office
TFTP Trivial File Transfer Protocol
VAC Voice Activity Compression

Release Notes for the CMTS 1000 V2.1

xiv 305472-B Rev 02

TECHNICAL PU BLICATIONS

You can now print technical manuals and release notes free, directly from
the Internet. Go to support.baynetworks.com/library. At the bottom of the
screen that comes up, select the product for which you desire information.
Using Adobe Acrobat Reader, you can open the manuals and release notes,
search for the sections you need, and print them on most standard printers.
You can download Acrobat Reader free from the Adobe Systems Web site,
www.adobe.com.

Documentation sets and CDs are available through your local Nortel Net­works sales office or account representative.

ASSOCIATED DOCUMENTS

Refer to the following documents for further information:

• Getting Started with the CM 100 directed at the end user, this document
provides operating and installation instructions for the CM 100 Cable
Modem.

• Release Notes for the CM 100 provides additional information not
available at the time of the Getting Started with the CM 100 manual’s
printing.

• Release Notes for the DOCSIS LCn Provisioning Server provides
additional information not available at the time of the Managing and
Operating the CMTS manual’s printing.

• Installing the CMTS 1000 provides installation instructions for the
CMTS 1000 Cable Modem Termination System.

• Installing CMTS 1000 Upstream Receivers describes how to install
CMTS Upstream Receivers and how to verify a successful installation.

• Managing and Operating the CMTS 1000 provides operating
instructions for the CMTS 1000’s provisioning server, its command
line interface (CLI) and its Management Information Base (MIB)
SNMP agent.

305472-B Rev 02 1-1

Release Notes for the

CMTS 1000 V2.1

PRODUCT DESCRIPTION

Nortel Networks Cable Modem Termination System (CMTS) 1000 is a
scalable cable access solution that allows cable operators to provide their
customers with reliable access to high-speed communications links over a
cable TV network. Additionally, the CMTS 1000 complies with the Data
Over Cable Service Interface Specification (DOCSIS), which defines a
standard for cable modems and the cable modem termination systems.

This document includes additional information that was not available at the
time of printing of the CMTS 1000 Installation Manual.

RESTRICTIONS

The equipment has an international auto-ranging internal power supply
which allows it to be powered from any 100–120, 220–240 VAC (50-60
Hz) source.

The CMTS supports up to10 Logical Link Control (LLC) protocol filter
entries, and 30 IP protocol filter entries.

Release Notes for the CMTS 1000

1-2 305472-B Rev 02

PREINSTALLATION CONFIGURATION

It is possible to communicate with the CMTS 1000 using any standard
terminal program (i.e., the Terminal.exe with Win3.1 or Win95). It is also
possible to use HyperTerminal with Win95 and Win98. The following
connection settings are required to communicate with t he CMTS 1000. You
need a 9-to-9 pin null modem cable for connection.

Settings

• Com Port = COM 1 or COM 2

• Baud = 9600

• Data Bits = 8

• Stop Bits = 1

• Parity = none

• Flow Control = none (off)

Emulation

• VT100

Miscellaneous

• Function, arrow, and Ctrl keys as terminal keys

• Append LF (line feed) to incoming line ends

• Follow the CMTS installation procedure from the CMTS Installation
Manual referenced in the Associated Documents section of this
manual.

Release Notes

305472-B Rev 02 1-3

UPGRADE RECOMMENDATIONS

• Read software upgrade “readme” file for the latest released software
upgrade information.

• Use a standard Simple Network Management Protocol (SNMP)
management station such as CastleRock SNMPc™.

• Have the network manager and TFTP file server residing on the same
PC.

• Ensure the person that is performing the software upgrade is proficient
in the operation and configuration of DOCSIS Cable Modems and
Cable Modem Termination Systems.

Traffic should be minimal on the network during the upgrade process
(including any automatic network management polling such as SNMPc™
Trend Watch and Auto Discover). After the upgrade has started, the
process takes approximately one minute per cable modem or cable modem
termination system. Network users should be notified that they will
experience interruptions during the upgrade process.

Upgrading the CMTS forces a reset that will cause the network to go down
for a few minutes.

Upgrade Procedure Summary

There are six basic steps to perform an upgrade to a CMTS 1000 using a
standard SNMP manager.

1. Verify contents of upgrade package.

2. Configure TFTP file server.

3. Ensure the CMTS 1000 can communicate with the TFTP server.

4. Initiate upgrade process.

5. Upgrade and compile the latest SNMP MIBs that are part of this
release.

Release Notes for the CMTS 1000

1-4 305472-B Rev 02

6. Verify upgrade completed successfully and that the active modems
successfully register with the CMTS. You can verify this by checking
the objectID MIB (lancityMcnsProdIdCMTS.2.2.1.0).

Note: If unit fails to respond after upgrade procedure, remove the unit from
the cable system before performing any troubleshooting procedures,
especially resetting the unit to factory defaults.

Step #1: Verify Contents of Upgrade Package

The distribution method for the CM 100 and CMTS 1000 upgrade is via a
Nortel Network-maintained FTP server and web site. Upgrade software
directories will include separate software files for the CM 100 and the
CMTS 1000. All pertinent SNMP MIB files are also included.

Step #2: Configure TFTP File Server

Perform the following procedure to setup the TFTP file server and install
the upgrade software.

Set the TFTP server’s default or public directory to the directory where you
will be copying the upgrade software.

Copy the CM 100 and CMTS 1000 upgrade software files to the TFTP
server’s default directory. We recommend using the data directory that you
use to save and provision the cable modem’s configuration and MD5 files.

Step #3: Ensure Devices Can Communicate with the TFTP Server

Use the Command Line Interface “ping-up” to verify that the CMTS can
communicate with the TFTP server.

Release Notes

305472-B Rev 02 1-5

Step #4: Initiate Upgrade Process

Software Upgrade via SNMP

Use the following procedure to upgrade a CMTS 1000 using an SNMP
manager.

1. Select CMTS 1000 to be upgraded.

2. Select the DocsDev MIB Object ID.

3. Select the Docs_Software MIB Object ID. The SNMP manager
displays the softwareInfo Table.

4. Set the Server IP Address to the IP Address of the TFTP server.

5. Set the Filename to the filename of the upgrade software that you
copied into the TFTP server’s default directory. Enter only the
filename. Do not enter the full path to the TFTP server’s public
directory.

Caution: All parameters must be set exactly as stated. Verify that all
previous steps are complete and accurate, especially file names and IP
Addresses. Verify that the TFTP server is ON and the loadable files are in
the TFTP server’s public directory.

6. Initiate the upgrade process by setting the AdminStatus MIB to
upgradeFromMgt.

You can monitor the process if your TFTP server has a display window, or
returns status information to you. The process takes about one minute.

Release Notes for the CMTS 1000

1-6 305472-B Rev 02

NEW FEATURES

Software Upgrade Integrity Check

The cycle Redundancy check is being verified during software upgrade in
addition to being checked on system start-up.

Baseline Privacy

RSA

Previous revisions of the CMTS support a 768 bit modulus RSA key. The
CMTS now supports 768 and 1024 bit modulus RSA keys. The CMs have
the option of sending either size key to the CMTS. The CMTS uses this
public key for encryption purposes (secrets) and the1024 bit modulus key
provides more security.

Log Messages

• If a cable modem’s Registration Request is rejected, it now logs the
reason.

• Added log message and console message if DHCP Relay is enabled
when the CMTS has no IP address.

Release Notes

305472-B Rev 02 1-7

PROBLEMS FIXED

The following problems were discovered in Release 2.0 of the CMTS and
corrected.

1.

An Internal inconsistency in the upstream scheduler caused the CMTS
to reset when the cable interface admin status was cycled from down to
up on a plant with more than 200 CMs.

2.

The frequency status table for Ingress Avoidance displayed
frequencies, as in use, though upstream interfaces were disabled.

3.

With Ingress Avoidance, changing a carrier path from one channel
group to another channel group could cause an invalid configuration.

4.

The CMTS would continuously reset when its provisioning file was
greater than 8192 bytes. The maximum size of a provisioning file is
now 40960 bytes.

5.

The CMTS did not record the modems IP address in
docsIfCmtsCmStatusIPAddress when the IP address was not in the
“modem IPaddress” parameter of the Registration Request.

6.

The “modems” command could cause the CMTS to reset when access
was denied to a modem.

7.

Enabling Ingress Avoidance did not force all upstreams in a channel
group to be within the valid frequency range.

8.

Metric status values were not being reset when Ingress Avoidance
forced a change due to channel groups.

9.

Provisioning of Ingress Avoidance Frequency Control Table and
Profile Table could cause an SNMP set error when Frequency Status is
available.

10.

An SNMP get-next on lcPhyIndex of the proprietary MIB with a large
index value was not working properly.

11.

Attempts to set docsIfUpChanel ModulationProfile from the Command
Line Interface failed.

12.

Ethernet Error statistics were incorrect when running full-duplex.

Release Notes for the CMTS 1000

1-8 305472-B Rev 02

13.

The CMTS downstream forwarding rate of 64 byte packets has been
increased by 60% with a single upstream.

ANOMALIES

1.

Ranging at 16 qam is not supported.

2.

Differential encoding is not supported.

3.

100 Mbit Autonegotiate operation will log a DHCP failure in the event
log.

Notes

The default nominal receive input power levels for each of the upstream
channel widths are as follows:

Channel Width Channel Power

3200000 mhz 11 dBmV
1600000 mhz 8 dBmV
800000 mhz 5 dBmV
400000 mhz 2 dBmV
200000 mhz 1 dBmV

305472-B Rev 02

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