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Cornerstone CMTS 1500 Version 4.2 Release Notes and Letter of Operational Considerations Release 4.2 Standard 1.8 June 2002 ARSVD00382

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Page 1: ARRIS CMS 1500

CornerstoneCMTS 1500 Version 4.2

Release Notes andLetter of OperationalConsiderationsRelease 4.2 Standard 1.8 June 2002

ARSVD00382

Page 2: ARRIS CMS 1500

CornerstoneCable Modem Termination System 1500Software Version 4.2Release Notes andLetter of Operational Considerations

Document number ARSVD00382Document release Release 1.8Document date June 2002

© 2002 ARRISAll Rights Reserved

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 reliable, but arepresented without express or implied warranty. User must take full responsibility for their applications ofany products specified in this document. The information in this document is proprietary to ARRIS.

ARRIS, ARRIS Interactive, and Voice Port are trademarks of ARRIS Licensing Company. Cornerstone is aregistered trademark of ARRIS Licensing Company.

The software described in this document is furnished under a license agreement and may only be used inaccordance with the terms of that license.

Page 3: ARRIS CMS 1500

Publication historyJune 2002

Standard 1.8 version of this document

Page 4: ARRIS CMS 1500

Table of contents1 Objectives of this Document __________________________________________ 1

1.1 ARRIS Commitment ______________________________________________ 1

1.2 Purpose and Scope of this Release___________________________________ 1

1.3 Product Identification______________________________________________ 1

1.4 Product Documentation ____________________________________________ 1

2 Release Notes ______________________________________________________ 2

2.1 New Features ____________________________________________________ 22.1.1 DOCSIS 1.1 Functionality _______________________________________ 22.1.2 Quality-of-Service______________________________________________ 22.1.3 Payload Header Suppression (PHS) ________________________________ 22.1.4 Committed Information Rate (CIR) _________________________________ 22.1.5 Mode “B” Forwarding __________________________________________ 22.1.6 Proxy-ARP server _____________________________________________ 22.1.7 Funnel Mode _________________________________________________ 32.1.8 ARP Spoofing Protection ________________________________________ 32.1.9 CM – Only DHCP Relay ________________________________________ 32.1.10 User Specified Aging Interval for De-Registered CMs ___________________ 32.1.11 User Specified Aging Interval for Ranged-But-Not-Registered CMs ________ 32.1.12 Purging Ethernet and CPE Entries __________________________________ 32.1.13 Enhanced Initial Ranging Opportunities ______________________________ 32.1.14 Modem State command _________________________________________ 42.1.15 Signal-To-Noise Ratio (SNR) MIB implementation_____________________ 4

2.2 Resolved Operational Considerations ________________________________ 4

3 Letter of Operational Considerations___________________________________ 6

3.1 Software Compatibility with the CMTS 1500 Hardware __________________ 6

3.2 Descriptions of Operational Considerations____________________________ 63.2.1 Bootp-Relay counter does not update properly ________________________ 63.2.2 SnmpInvalidMessage counter does not function properly._________________ 63.2.3 SnmpUnknownPDUHandlers counter does not increment _______________ 73.2.4 SnmpUnknownSecurityModels counter does not increment ______________ 73.2.5 Cannot set message size if snmpTargetAddr table status is active ___________ 73.2.6 SNMP Notification filters are not working ____________________________ 83.2.7 SSH host-key and server-key need to be regenerated at the same time ______ 83.2.8 CLI limitation where it is unable to enter the max string length (255) for the taglist.

9

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3.2.9 Docsistrapcontrol (docsDevCmtsTrapControl) value in putmng output is incorrect9

3.2.10 send-inform (lcdocsCmtsTrapTypeControl) value in putmng output is incorrect 113.2.11 After creating a v3 user and cloning it to AuthPrivMD5/SHA, upon reset theprotocols can change. ________________________________________________ 113.2.12 When creating SNMPv3 users you have to change the V3 passwords before theaccounts can be turned on. ____________________________________________ 123.2.13 After setting a SNMPv3 user to no auth and no priv protocols, the auth protocolcan not be set or cloned ______________________________________________ 123.2.14 SSH host/server bits values lost___________________________________ 123.2.15 Reset on invalid QoS Parameter __________________________________ 133.2.16 Ingress Avoidance frequency switching unavailability ___________________ 133.2.17 Upstream loss in constant frequency changes _________________________ 14

4 Customer Service and Support _______________________________________ 15

Appendix A - Acronyms and Terms________________________________________ 16

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CMTS 4.2 Release Notes & Letter of Operational Considerations Page 1 of 22

1 Objectives of this Document

1.1 ARRIS CommitmentARRIS is committed to developing high quality, value-added products and services to the Multi-ServiceOperator (MSO). We continue to drive toward meeting our customers’ needs with solutions that will helpachieve their business objectives.

1.2 Purpose and Scope of this ReleaseThis document is intended to describe the value-added features and anomaly resolution implemented in thisCMTS 1500 v4.2 software release. It will also inform operators of Known Operational Considerationsassociated with this product release that have been identified either through ARRIS testing or fieldoperations.

1.3 Product IdentificationDescribed here is the CMTS 1500 v4.2 software intended for the ARRIS Cornerstone CMTS 1500 device.

Associated Product

Cornerstone CMTS 1500

1.4 Product DocumentationProduct documentation is on CD-ROM (Product ID 708643/Part number ARSVD00480) and is packagedwith the software CD. The documentation suite includes the following:

• Cornerstone CMTS 1500 v4.2 Installation Guide (ARSVD00379)

• Cornerstone CMTS 1500 v4.2 User Guide (ARSVD00380)

• Cornerstone CMTS 1500 v4.2 Command Line Interface (CLI) Reference Guide (ARSVD00381)

• Cornerstone CMTS 1500 v4.2 Release Notes and Letter of Operational Considerations(ARSVD00382)

• Cornerstone CMTS 1500 v 4.2 Customer Letter (ARSVD00383)

• Cornerstone CMTS 1500 v 4.2 Error Codes Guide (ARSVD00541)

• Cornerstone CMTS 1500 v 4.2 CLI Quick Reference Guide (ARSVD00542)

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CMTS 4.2 Release Notes & Letter of Operational Considerations Page 2 of 22

2 Release Notes

2.1 New FeaturesThe Cornerstone CMTS 1500 software v4.2 provides additional features built upon the proven technologyoperators have already experienced. The Features section will identify the commands and functions builtinto this software. Further information that will expand upon these descriptions can be found in theCornerstone CMTS 1500 product documentation.

2.1.1 DOCSIS 1.1 FunctionalityThe v4.2 software release is CableLabs compliant with DOCSIS 1.1 specification.

2.1.2 Quality-of-ServiceQuality of Service supports multiple service levels in the network. Release v4.2 is DOCSIS 1.1 compliant,which supports of the ability to create, admit and activate service flows when needed and delete serviceflows when no longer required. In addition to supporting VoIP applications, Release v4.2 software also letscable operators provide enhanced IP data services.

2.1.3 Payload Header Suppression (PHS)Payload Header Suppression (PHS) helps optimize network performance by reducing the packet size used.PHS removes repetitive information from an IP (Internet Protocol) packet on a continuous data streamdestined for the same location.

2.1.4 Committed Information Rate (CIR)The Committed Information Rate (CIR) service provides the cable modem downstream traffic with a minimumlevel of service at the Service Flow level. The committed level may be exceeded with additional traffic beingforwarded as best effort.

2.1.5 Mode “B” ForwardingMode “B” Forwarding instructs the CMTS to learn the IP address, MAC address, CM Security Association-ID, and lease-time from the DHCP discover and offer process. The information is then aged out by thelearned lease-time of the cable modem and customer premises equipment.

2.1.6 Proxy-ARP serverWith Mode “B” Forwarding enabled, the CMTS operates as a proxy Address Resolution Protocol server byintercepting all ARP packets. On receiving an ARP for a device not within the Forwarding Database, theCMTS issues the ARP request for the destination IP address. When the reply is received, the CMTS willupdate its Forwarding Database and respond to the requesting device.

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CMTS 4.2 Release Notes & Letter of Operational Considerations Page 3 of 22

2.1.7 Funnel ModeFunnel Mode gives the operator the ability to direct IP packets that originate from the Cornerstone CMTSunit’s RF network and which are destined back to the RF network to be funneled out onto the Ethernetnetwork. The IP packets are then directed to an IP Address for traffic shaping (i.e. permission server).

2.1.8 ARP Spoofing ProtectionThe ARP Spoofing feature will help prevent IP address theft. When a CPE device tries to use an IP addressnot assigned by the DHCP service, the CMTS will forgo forwarding that device’s traffic.

2.1.9 CM – Only DHCP RelayCM-Only DHCP Relay is a new feature added to the Bootp-Relay-Control command. This function sets upthe CMTS to convert the broadcast DHCP request from a cable modem to a uni-cast message and direct itto the provisioning service identified in the bootp-list command. Customer Premise Equipment’s (CPE)DHCP discover packet will be forwarded unmodified to the Ethernet network as the original broadcastmessage sent.

2.1.10 User Specified Aging Interval for De-Registered CMsIn previous CMTS software, when a CM de-registers its address would be removed from the FDB after a 48-hour time-to-live interval. Now v4.2 gives the operator a specifiable time interval settable via SNMP or CLIManage command. The “User Specified Aging Interval for De-Registered CM’ parameter instructs the CMTSas to the number of seconds to wait before purging a CM that has de-registered from the CMTS.

2.1.11 User Specified Aging Interval for Ranged-But-Not-RegisteredCMs

A new aging parameter within the CMTS is offered as a time-to-live for cable modems that have ranged butnot registered. Cable modems that have ranged to the CMTS downstream and upstream frequencies buthave not received their configuration files are placed in the “User Specified Aging Interval for Ranged-But-Not-Registered” timer to be removed from the Forwarding Database so that CM does not occupy an entryneeded. The operator can configure the aging parameter based upon network needs to allow the cablemodem to range, DHCP, TFTP, and register with the CMTS. Once the cable modem registers, its agingtime will be reset to the Registered CM time-to-live value.

2.1.12 Purging Ethernet and CPE EntriesPurge-FDB is a feature that gives the CMTS operator a method to remove non-CM devices from the FDB.Static entries and entries for the CATV and Ethernet will not be affected. This feature is implemented via aCLI command only.

2.1.13 Enhanced Initial Ranging OpportunitiesThis feature sets Initial Ranging Opportunities to a two-step interval: one-tenth of a second interval for thefirst ten minutes after an upstream channel is started then one-half second thereafter. The operator canspecify a value that will have precedence.

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CMTS 4.2 Release Notes & Letter of Operational Considerations Page 4 of 22

2.1.14 Modem State commandThe Modem State command has been enhanced to deliver additional information about the cable modem.Also with DOCSIS 1.1 type modems, even more details are learned about the CM. The Modem Statecommand function and use can be reviewed in the Cornerstone CMTS 1500 Command Line Interface (CLI)Reference Guide.

2.1.15 Signal-To-Noise Ratio (SNR) MIB implementationThe CMTS software has been modified to now support the docsIfSigQSignalNoise MIB object locatedin the docsIfSignalQualityTable. The following is the description of the MIB object:

docsIfSigQSignalNoise OBJECT-TYPE SYNTAX TenthdBmV UNITS "db" MAX-ACCESS read-only STATUS current DESCRIPTION "Signal/Noise ratio as perceived for this channel. At the CM, describes the Signal/Noise of the downstream channel. At the CMTS, describes the average Signal/Noise of the upstream channel." REFERENCE "DOCSIS Radio Frequency Interface Specification, Table 2-1 and 2-2." ::= { docsIfSignalQualityEntry 5 }

The MIB can be accessed via the CLI console, CLI Manage, or through an external SNMP manager. Thesignal-to-noise ratio (SNR) describes the ratio between the averaged signal amplitude and the noiseamplitude of an upstream channel (in tenth dBs). To compute the SNR the hardware needs a certainminimum amount of traffic on that upstream. Accuracy is within ±1.5dB for QPSK and within ±2dB for QAM-16 when SNR is within 15 to 25dB. By convention, a channel with a SNR of 30dB or higher is considered a“clean channel”. An optimum is typically at 35dB and when getting close to around 21dB when modems willdrop off in big numbers.

2.2 Resolved Operational ConsiderationsThe listed Resolved Operational Considerations have been implemented in this release of the CMTS 1500v4.2 software and any future releases.

Tracking No. Resolved Description

12Y8W CMTS lockup due to no available buffers.

130ED Changing Upstream modulation profile caused CMTS 1500 to reset

11I5L QoS descriptor address modified unintentionally

11YA5 Assert in hebp_reg.c

129MR Reset caused in dp_remove_from_cmid

12BHG lcconcatenationenabled.0 not displayed in putcfg/putmng command

12NA5 getmng incorrectly records MIB variable which have value truth

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CMTS 4.2 Release Notes & Letter of Operational Considerations Page 5 of 22

Tracking No. Resolved Description

12EF0 Mode B – zero length the PDU of queued packets

108MR Intelligent Ingress Avoidance does not work correctly

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CMTS 4.2 Release Notes & Letter of Operational Considerations Page 6 of 22

3 Letter of Operational ConsiderationsSystem operating considerations for the CMTS 1500 v4.2 that may affect service, operations or maintenanceof the software and hardware release are described below. Unless specifically noted, it is ARRIS’ intentionto have all these considerations resolved in future software releases.

3.1 Software Compatibility with the CMTS 1500 HardwareVersion 4.2 operates only on the ARRIS CMTS 1500/1100. The software is incompatible with the CMTS1000. Also, software intended solely for the CMTS 1000 will not function on the CMTS 1500/1100.

3.2 Descriptions of Operational Considerations

3.2.1 Bootp-Relay counter does not update properlyTracking No. Q00042583

Description A counter that tracks the packets forwarded by the bootp-relay does notupdate consistently.

Impact Non-Service Affecting: Counter does not reflect the actual value of packetsforwarded.

Probability ofOccurrence

High

Work Around None

Affected loads 4.2.4

Status Open

Field Bulletin No.

3.2.2 SnmpInvalidMessage counter does not function properly.Tracking No. 1-Q7AH

Description The snmpInvalidMessage counter does not appear to increment whenreceiving an SNMP packet with the message flag set to 0x02.

Impact Non-Service Affecting: SnmpInvalidMessage would not reflect the correctnumber of problem messages received.

Probability ofOccurrence

Low

Work Around None

Affected loads 4.2.4

Status Open

Field Bulletin No.

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CMTS 4.2 Release Notes & Letter of Operational Considerations Page 7 of 22

3.2.3 SnmpUnknownPDUHandlers counter does not incrementTracking No. 1-Q7AM

Description The snmpUnknownPDUHandlers counter does not increment when receivingan SNMP packet that has the context engine identifier encoded as a zerolength octet string.

Impact Non-Service Affecting: Counter does not reflect the actual value.

Probability ofOccurrence

Low

Work Around None

Affected loads 4.2.4

Status Open

Field Bulletin No.

3.2.4 SnmpUnknownSecurityModels counter does not incrementTracking No. 1-Q7AD

Description The snmpUnknownSecurityModels counter does not increment when sendinga get request to the CMTS using an invalid version number for SNMP.

Impact Non-Service Affecting: Counter does not reflect the actual value.

Probability ofOccurrence

Low

Work Around None

Affected loads 4.2.4

Status Open

Field Bulletin No.

3.2.5 Cannot set message size if snmpTargetAddr table status isactive

Tracking No. 1-Q0QA

Description Cannot set the message-size parameter[box/snmp/coex/snmptargetaddrest-specific/] to a legal value from the CLI. Itreturns an error if snmpTargetAddrTAddress table status is set to active.

Impact Non-Service Affecting: Unable to set snmpTargetAddr to active.

Probability ofOccurrence

Low

Work Around Set snmpTargetAddrTAddress to disable before setting[box/snmp/coex/snmptargetaddrest-specific] using the CLI.

Affected loads 4.2.4

Status Open

Field Bulletin No.

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CMTS 4.2 Release Notes & Letter of Operational Considerations Page 8 of 22

3.2.6 SNMP Notification filters are not workingTracking No. 1-NWKW

Description A CMTS 1500 running in SNMP Coexistence mode and capable of sendingout both SNMP inform and notification messages will not submit traps whenentries are created in the SNMP Filter and SNMP Filter Profile Table Traps.

Impact Non-Service Affecting: No traps sent.

Probability ofOccurrence

Low

Work Around When CMTS 1500 is in SNMP Coexistence mode and configured to sendtraps, refrain from creating entries in SNMP Filter and SNMP Filter ProfileTable Traps.

Affected loads 4.2.4

Status Open

Field Bulletin No.

3.2.7 SSH host-key and server-key need to be regenerated at thesame time

Tracking No. Q00135342

Description Values of host-key and server-key cannot be set in CLI console command"ssh-keygen" separately. Both parameters have to be entered and theKeys need to be regenerated in the same line.

If operator enters one after the other, the CLI will "forget" what was enteredfirst. Example:

( Starting from factory reset. )remote1> sshThe current SSH key parameters are: Host Key bits = 0, Server Key bits = 0remote1> ssh -hb 1024remote1> sshThe current SSH key parameters are: Host Key bits = 1024, Server Key bits = 0remote1> ssh -sb 768remote1> sshThe current SSH key parameters are: Host Key bits = 0, Server Key bits = 768

Impact Non-Service Affecting

Probability ofOccurrence

Low

Work Around Enter both the host-key and server-key on the same command line structureas follows:remote1> ssh -hb 1024 -sb 768

Affected loads 4.2.4

Status Open

Field Bulletin No.

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CMTS 4.2 Release Notes & Letter of Operational Considerations Page 9 of 22

3.2.8 CLI limitation where it is unable to enter the max stringlength (255) for the taglist.

Tracking No. 1-NDA5

Description The maximum size that the taglist is 255 characters. This problem is relatedto the limitation of the CLI where the maximum string that can be entered isapproximately 90 characters.

Impact Non-Service Affecting

Probability ofOccurrence

Low

Work Around The workaround to the CLI string length of 255 chars for the taglist, can beentered from an SNMP manager.

Affected loads 4.2.4

Status Open

Field Bulletin No.

3.2.9 Docsistrapcontrol (docsDevCmtsTrapControl) value inputmng output is incorrect

Tracking No. 1-OX81

Description Docsistrapcontrol (docsDevCmtsTrapControl) value in putmng output isincorrect. It will always display the value “Dynsec” no matter whatdocsistrapcontrol is set to. Example:

[] docs-traps# docsistrapcontrol

Parameter Value --------- ----- docsistrapcontrol RegReq[] docs-traps# @putmng display$ admin sw-server-ip-addr 10.10.213.101$ downstream frequency 681000000$ docs-traps docsistrapcontrol Dynsec[] docs-traps#

Impact Non-Service Affecting

Probability ofOccurrence

Low

Work Around None

Affected loads 4.2.4

Status Open

Field Bulletin No.

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CMTS 4.2 Release Notes & Letter of Operational Considerations Page 10 of 22

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CMTS 4.2 Release Notes & Letter of Operational Considerations Page 11 of 22

3.2.10 send-inform (lcdocsCmtsTrapTypeControl) value in putmngoutput is incorrect

Tracking No. 1-OX83

Description send-inform (lcdocsCmtsTrapTypeControl) value in putmng output is incorrect.It always displays as “all-traps” regardless of how send-inform is set.Example:

[] docs-traps# send-inform

Parameter Value --------- ----- send-inform RegRsp

[] docs-traps# @putmng display$ admin sw-server-ip-addr 10.10.213.101$ downstream frequency 681000000$ docs-traps send-inform all-traps[] docs-traps#

Impact Non-Service Affecting

Probability ofOccurrence

Low

Work Around None

Affected loads 4.2.4

Status Open

Field Bulletin No.

3.2.11 After creating a v3 user and cloning it to AuthPrivMD5/SHA,upon reset the protocols can change.

Tracking No. 1-PMRH

Description If a v3 user with Authentication but no Privacy protocol is configured bycloning it to another v3 user with Authentication and Privacy protocols set,upon resetting the CMTS the privacy protocol will revert to the protocol of thecloned user.

Impact Non-Service Affecting

Probability ofOccurrence

Low

Work Around The user will function properly, as if it still had no privacy protocol set, but thedisplay is inaccurate. This can be observed from the CLI and SNMP manager.

Affected loads 4.2.4

Status Open

Field Bulletin No.

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CMTS 4.2 Release Notes & Letter of Operational Considerations Page 12 of 22

3.2.12 When creating SNMPv3 users you have to change the V3passwords before the accounts can be turned on.

Tracking No. 1-PN01

Description When creating SNMPv3 accounts, you have to change the v3 passwordsbefore the accounts can be turned on.

Impact Non-Service Affecting: SNMPv3 not active until passwords set.

Probability ofOccurrence

Low

Work Around Set the v3 password before activating the account.

Affected loads 4.2.4

Status Open

Field Bulletin No.

3.2.13 After setting a SNMPv3 user to no auth and no privprotocols, the auth protocol can not be set or cloned

Tracking No. 1-PMRN

Description After setting a v3 user (which previously had been cloned to use auth and privprotocols) to no auth and no priv protocols, the auth and priv protocols cannotbe set or cloned.

Impact Non-Service Affecting: SNMPv3 user will not have auth or priv is cloned.

Probability ofOccurrence

Low

Work Around The user account must be deleted and reconfigured.

Affected loads 4.2.4

Status Open

Field Bulletin No.

3.2.14 SSH host/server bits values lostTracking No. 1-16LC1

Description The CMTS does not remember the ssh host/server bits values set by the CLIkeygen command.

Impact Non-Service Affecting

Probability ofOccurrence

High when using the ssh keygen command.

Work Around Use the –regen flag option at the end of the ssh keygen <value> command toensure the values are displayed.

Affected loads 4.2.4

Status Open

Field Bulletin No.

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CMTS 4.2 Release Notes & Letter of Operational Considerations Page 13 of 22

3.2.15 Reset on invalid QoS ParameterTracking No. 1-9P51

Description If a SNMP Get is performed on a non-existent QoS parameter set the CMTSmay experience watchdot reset.

Example: From the CLI manage command…[root] qos-1.1-level# qos-params-specific/4/admitted[root] qos-params-specific/4/admitted# show

Name Value----------- -------------SNMP Error: No Such Name

And the “4” did not exist, then the CMTS may reset.

Impact The CMTS will reset and re-initialize automatically.

Probability ofOccurrence

100% when performing a SNMP Get on a non-existent QoS parameter set.

Work Around The CMTS will automatically re-initialize and restore service.

Affected loads 4.2.4

Status Open

Field Bulletin No.

3.2.16 Ingress Avoidance frequency switching unavailabilityTracking No. 1-8RYL

Description Ingress Avoidance may continue to use frequency ranges that are marked asunavailable even though an available range may exist.

If Ingress Avoidance was using frequency range A, then A was marked asunavailable and no other ranges were available then it will stay on A asdesigned. However, when a new frequency range, B, is enabled and availablethe CMTS will not change from frequency A even though it is marked asunavailable.

Impact The CMTS may remain on an upstream frequency where performance is beinginhibited due to noise.

Probability ofOccurrence

50% occurrence

Work Around Disable and re-enable Ingress Avoidance.

Affected loads 4.2.4

Status Open

Field Bulletin No.

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CMTS 4.2 Release Notes & Letter of Operational Considerations Page 14 of 22

3.2.17 Upstream loss in constant frequency changesTracking No. 1-17GCP

Description If the upstream center frequency is changed at a constant interval over aperiod of several days, the CMTS upstreams may go deaf.

Impact Cable Modems will not be able to range or register on the CMTS.

Probability ofOccurrence

50% of the time during constant frequency changes as a result of poor RFplant performance.

Work Around The CMTS must be reset in order to recover from this state.

Affected loads 4.2.4

Status Open

Field Bulletin No.

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CMTS 4.2 Release Notes & Letter of Operational Considerations Page 15 of 22

4 Customer Service and SupportContact your account representative for further information on the Cornerstone CMTS 1500/1100. ForTechnical Support:

North AmericaE-mail: [email protected]: (888) 221 9797 (toll free)

678 473 5656Hours: 8:00 a.m. to 8:00 p.m. EST

Worldwide – ARRIS Technical Support within North AmericaPhone: +01 678 473 5656

South AmericaE-mail: [email protected]: +56 9 837 8883Hours: 9:00 a.m. to 6:00 p.m.

EuropeE-mail: [email protected]: +31 (0)20 354 8000Hours: 8:30 a.m. to 5:30 p.m. CET

Asia (except Japan)E-mail: [email protected]: +852 2738 1678Hours: 9:00 a.m. to 6:00 p.m. (Hong Kong local time)

JapanE-mail: [email protected]: +81 (0) 3 5371-4142Hours: 9:00 a.m. to 5:00 p.m. (Tokyo local time)

Emergency support is available after normal business hours.

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CMTS 4.2 Release Notes & Letter of Operational Considerations Page 16 of 22

Appendix A - Acronyms and TermsThe CMTS 1500 has specific acronyms and terms that may be unfamiliar. Many of these terms are derivedfrom the DOCSIS specifications or are data networking vocabulary.

BE Best Effort (type of upstream service

BPI Baseline Privacy Interface

BPI+ Baseline Privacy Interface Plus (enhanced privacy requirements of DOCSIS 1.1)

CAM Content Addressable Memory

CBR Constant Bit Rate (used for telephony)

CIR Committed Information Rate (used for data)

Classifier A set of criteria used for packet matching according to TCP, UDP, IP, LLC, and/or 802.1p/q packet fields. A classifier maps each packet to a service flow. Classifiers are dividedinto upstream classifiers and downstream classifiers.

DSA Dynamic Service Addition

DSC Dynamic Service Change (in QoS)

DSD Dynamic Service Deletion

IA Ingress Avoidance

LOC Loss of Communications (alarm)

NrtPS Non-Real-Time Polling Service

OSSI Operations Support System Interface

PHS Packet Header Suppression

QoS Parameter Set

A set of service flow encodings that describe the Quality of Service attributes of a serviceflow.

QoS Quality of Service

RtPS Real-Time Polling Service

SA Spectrum Analyzer (enhanced function of eighth upstream receiver in CMTS 1500)

Service Class A set of queuing and scheduling attributes that is named and configured at the CMTS. Aservice class is identified by a service class name and has a set of zero or more QoS trafficattributes.

Service Flow A MAC-layer transport service which (1) provides unidirectional transport of packets fromthe upper layer service entity to the RF; (2) shapes, policies, and prioritizes trafficaccording to QoS traffic parameters defined for the flow.

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CMTS 4.2 Release Notes & Letter of Operational Considerations Page 17 of 22

Service Flow Description

A service class name that describes a service flow’s QoS parameters indirectly or a QoSparameter set that describes them directly.

Service Identifier (SID)

A service flow identifier assigned by the CMTS to an active or admitted upstream serviceflow (14 bits).

SFID Service Flow Identifier-An identifier assigned to a service flow by the CMTS (32 bits).

SSH Secure Shell (protocol)

UCC Upstream Channel Change

UGS/AD Unsolicited Grant with Activity Detection