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Octal-Port DMT ATU-C Line Card

dmt margin

17

Cisco IOS Release 12.1(6)DA

dmt margin

To set upstream and downstream signal-to-noise ratio (SNR) margins for a DMT profile, use the dmt
margin command. To reset this command to the default value, use the no form of this command.

dmt margin downstream dmt-margin upstream dmt-margin

Syntax Description

Defaults

Downstream: 6 dB

Upstream: 6 dB

Command Modes

Profile configuration.

Command History

Usage Guidelines

Caution

This command causes the port to retrain when you change the parameter.

Setting a parameter to its current value does not cause a retrain. If a port is training when you change
this value, the port untrains and retrains to the new value.

Examples

In this example, the command sets the SNR margins of the default profile to 12 dB downstream and
6 dB upstream:

DSLAM# configure terminal

DSLAM(config)# dsl-profile default

DSLAM(config-dsl-prof)# dmt margin downstream 12 upstream 6

Related Commands

None.

dmt-margin

Enter the upstream and downstream SNR margins in decibels. The range is
0 to 15.

Release

Modification

12.0(5)DA

This command was introduced.

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Содержание Octal-Port DMT ATU-C Line Card

Страница 1: ...higher port density for the Cisco 6015 Cisco 6160 and Cisco 6260 This line card Supports eight ADSL modem connections per card Converts ADSL modulation from the line card into digital data streams to and from the NI 2 card Negotiates the line rate with the customer premises equipment CPE when it trains and bases the rate on line quality and distance Provides subscriber and port provisioning throug...

Страница 2: ...enabled dual latency is not supported at this time Thus the maximum bit rates for the unused path must be zero For example to configure and use the fast path you must specify nonzero maximum bit rates for the fast path Once you configure the maximum bit rates for the fast path the rates for the interleave path must be zero The IOS software ensures that only one path is enabled at a given time Trel...

Страница 3: ...s not spectrally compatible with SDSL G shdsl or IDSL Place these cards in a separate chassis half when using them in the same chassis as 8xDMT line cards Related Features and Technologies The 8xDMT line card is an upgrade of the 4xDMT 6260 and 4xFlexi 6160 6260 6015 line cards Related Documents Hardware Documents A complete list of all DSL hardware product related documentation is available on th...

Страница 4: ... subscriber line through the main distribution frame MDF connections CPE Cisco 677 Cisco 678 Cisco Soho 77 Cisco 827 Cisco IAD 2423 Cisco 1700 Cisco 2600 and Cisco 3600 series with ADSL WIC Alcatel Speed Touch Home Alcatel Speed Touch Pro Efficient Networks 5260 and 5262 Westell modems based on Alcatel Microelectronics firmware version 1 4 1 CPE using ADI chipsets with firmware versions 0X3019BE70...

Страница 5: ...r 8xDMT From AdslLineConfProfileEntry adslAtucConfRateChanRatio adslAtucConfMaxSnrMgn adslAtucConfUpshiftSnrMgn adslAturConfRateChanRatio adslAturConfMaxSnrMgn adslAturConfUpshiftSnrMgn adslAturConfMinUpshiftTime AdslLineAlarmConfProfileEntry ADSL Forum TR 014 DMT Line Code Specific MIB Objects not supported for 8xDMT From AdslLineDmtConfProfileEntry adslAtucDmtConfFreqBins adslAturDmtConfFreqBins...

Страница 6: ...d Tips After you have completed these steps insert the 8xDMT line card to activate the card with your preprovisioned configuration Verifying the Preprovisioned Slot Use the show running configuration command to verify that you preprovisioned the slot correctly Command Purpose Step 1 DSLAM config slot 1 ATUC 1 DMT8 This command associates the 8xDMT line card with the specified slot Step 2 DSLAM con...

Страница 7: ...it rate signal to noise ratio DMT check bytes and overhead framing parameters in your DSL profile Caution Before migrating from interleave mode to fast path determine whether the deployed CPEs offer support for the feature The Cisco 600 series CPEs currently do not support fast path Command Purpose Step 1 DSLAM config dsl profile 8xDMT Select the profile that you want to attach to the selected por...

Страница 8: ...0 Step 4 DSLAM config dsl profile dmt margin downstream 12 upstream 6 Set the downstream and upstream signal to noise ratio SNR margins for a DSL profile Step 5 DSLAM config dsl profile dmt overhead framing mode1 Set the overhead framing mode in this example to 1 Step 6 DSLAM config dsl profile exit Return to the global configuration prompt Command Purpose Command Purpose DSLAM show dsl interface ...

Страница 9: ... ni2 dsl mz 121 6 DA bin slot 1 ATUC 4FLEXIDMT slot 2 ATUC 1 DMT8 slot 3 ATUC 4FLEXIDMT slot 4 ATUC 4FLEXIDMT slot 5 ATUC 4FLEXIDMT slot 6 ATUC 4FLEXIDMT enable password cisco dsl profile default dmt bitrate maximum interleaved downstream 8032 upstream 864 cap bitrate maximum downstream 7168 upstream 1088 dsl profile 8xdmt dsl profile 8xDMT2 dmt overhead framing mode1 dmt check bytes fast downstre...

Страница 10: ...ts the new and modified commands that are specific to the8xDMT feature All other commands used with this feature are documented in the Command Reference for Cisco DSLAMS with NI 2 For information on other Cisco IOS commands that can be used on the NI 2 DSL systems see the Cisco ATM Switch Router Command Reference Guide ...

Страница 11: ...disabling alarms affects the specified profile only For example if you disable alarms on the default profile other profiles are unaffected Use alarms and no alarms to enable and disable minor alarms related to DSL subscriber ports When these alarms are disabled you receive no notification when alarm conditions exist Notification methods include console messages LEDs the output of the show facility...

Страница 12: ...minal DSLAM config dsl profile default DSLAM config dsl prof alarms Related Commands Command Description dsl profile profile name Select an existing DSL profile for modification show dsl interface atm slot port Display DSL DMT and ATM status for a port show dsl profile Display a specific profile all ports to which the profile is currently attached and those port settings show facility alarm status...

Страница 13: ... cause the port to retrain The default no dmt bitrate minimum fast sets both the minimum downstream and upstream fastpath bit rates to zero This command does not cause the port to retrain Command Modes Profile configuration Command History Usage Guidelines Only the alarm subsystem uses the minimum bit rate settings Cisco IOS asserts an alarm if the line card trains at a rate below the configured m...

Страница 14: ... DSLAM config dsl prof dmt bitrate maximum interleaved downstream 3200 upstream 640 Related Commands Table 2 Allowable Ranges and Default Values for DMT Bit Rates Downstream Upstream Configuration Parameter Data Path Aggregate Range kbps Path Range kbps Path Default kbps Aggregate Range kbps Path Range kbps Path Default kbps DMT bit rate max Fast 8064 to 32 8064 to 32 0 864 to 32 864 to 0 0 DMT bi...

Страница 15: ...he capabilities of the ATU R CPE affect the achievable value for this parameter As a result the check bytes value to which the line trains may be smaller than the value you configure If you want to use more check bytes than the system is allowing you use the dmt bitrate command to reduce the bit rate Use the command show dsl interface atm slot port to display the configured and actual check bytes ...

Страница 16: ...Octal Port DMT ATU C Line Card dmt check bytes 16 Cisco IOS Release 12 1 6 DA Related Commands None ...

Страница 17: ...s Caution This command causes the port to retrain when you change the parameter Setting a parameter to its current value does not cause a retrain If a port is training when you change this value the port untrains and retrains to the new value Examples In this example the command sets the SNR margins of the default profile to 12 dB downstream and 6 dB upstream DSLAM configure terminal DSLAM config ...

Страница 18: ...Defaults The default configuration no dmt minrate blocking generates a minor alarm when the bit rates on a DMT port violate the minimum allowed bit rates specified in the dmt bitrate minimum command if alarms are enabled in the DSL profile Command Modes DSL profile configuration Command History Usage Guidelines To specify the bit rate below which a DMT port will not retrain use the dmt bitrate min...

Страница 19: ...framing Full overhead Reduced overhead There are also two versions of full overhead Asynchronous Synchronous You select the type of ADSL framing by choosing one of four modes Mode 0 Full overhead framing with asynchronous bit to modem timing an enabled synchronization control mechanism Mode 1 Full overhead framing with synchronous bit to modem timing a disabled synchronization control mechanism mo...

Страница 20: ...ucture number indicated by the ATU R Management requirements drive the determination of overhead full or reduced Full overhead provides more bandwidth to the embedded operations channel EOC enabling higher polling rates However reduced overhead provides enough EOC bandwidth to satisfy typical applications The dmt overhead framing command does not cause port retrain when you change the parameter Ex...

Страница 21: ...on the default values of dmt rate adaptation interval and dmt rate adaptation margin see the dmt rate adaptation interval section on page 22 and the dmt rate adaptation margin section on page 24 Command Modes DSL profile configuration Command History Usage Guidelines If you wish to modify the default configuration of the dmt rate adaptation interval and dmt rate adaptation margin see the dmt rate ...

Страница 22: ...ing those specified in the dmt rate adaptation margin command number of eoc updates The number of eoc updates argument specifies the monitoring interval in multiples of six seconds on a downstream DMT port Note The downstream margin see dmt rate adaptation margin section on page 24 is obtained from the CPE via the embedded operations channel EOC The downstream number of eoc updates parameter speci...

Страница 23: ... retrains to a lower bit rate to improve SNR margin quality on the line Note If line conditions improve the line does not automatically drop and retrain to a higher bit rate If the line conditions improve the administrator must execute a shut then a no shut on the port to retrain to a higher bit rate Examples The following example configures a downstream monitoring interval of roughly 60 to 150 se...

Страница 24: ...ith the dmt rate adaptation interval command If the actual SNR margins on a port remain lower than the margins configured in the dmt rate adaptation margin command for the duration of time specified in the dmt rate adaptation interval command the line drops and retrains to a lower bit rate to improve SNR margin quality on the line Note If line conditions improve the line does not automatically dro...

Страница 25: ...ne card type for which you want to configure the slot The valid card types are ATUC 1 4DMT 4 port DMT card ATUC 1 4DMT I 4 port DMT over ISDN card ATUC 4FLEXICAP 4 port flexi card configured as CAP ATUC 4FLEXIDMT 4 port flexi card configured as DMT ATUC 1 DMT8 8 port DMT card ITUC 1 8IDSL 8 port IDSL card STUC 4 2B1Q DIR 1 4 port SDSL card Note Some line cards do not function in all NI 2 DSL syste...

Страница 26: ...y incompatible with both the 8 port IDSL line card and the 4 port SDSL STU C line card If you install spectrally incompatible cards in the same chassis the lines served by those cards can suffer reduced performance For best performance in a chassis with a mixture of line card types always install 8xDMT line cards on one side of the chassis and install IDSL and SDSL cards on the opposite side Examp...

Страница 27: ...TM ATM Asynchronous Transfer Mode A cell based data transfer technique in which channel demand determines packet allocation ATM offers fast packet technology real time demand led switching for efficient use of network resources ATU C ADSL Transmission Unit central office ATU R ADSL Transmission Unit remote C CBOS Cisco Broadband Operating System Operating System that users access to configure and ...

Страница 28: ... Transfer Protocol The Internet protocol and program used to transfer files between hosts G G 992 2 The ITU standard for line coding and framing for splitterless reduced spectrum ADSL Also known as G lite G 994 1 The ITU standard for signalling identification and negotiation between broadband systems an integral part of G dmt and G lite Also known as G hs G 997 1 The ITU standard for performance m...

Страница 29: ...trying to locate a faulty piece of equipment loopbacks will be repeated eliminating satisfactory machines until the problem is found LOS loss of signal M Management Information Base See MIB MIB Management Information Base A collection of objects that can be accessed via a network management protocol such as SNMP and CMIP Common Management Information Protocol N NI 2 A second generation network int...

Страница 30: ...t suite of protocols providing reliable connection oriented full duplex streams T1 413 The ANSI standard for line coding and framing for full rate ADSL Telnet The virtual terminal protocol in the Internet suite of protocols Allows users of one host to log into a remote host and act as normal terminal users of that host TFTP Trivial File Transfer Protocol A simple file transfer protocol a simplifie...

Страница 31: ...t PVC or switched SVC In ATM a virtual circuit is called a virtual channel Sometimes abbreviated VC See also PVC SVC VCI and VPI virtual circuit See VC VCI Virtual channel identifier A 16 bit field in the header of an ATM cell The VCI together with the VPI is used to identify the next destination of a cell as it passes through to the ATM switch Sometimes called virtual channel connection See also ...

Страница 32: ...Octal Port DMT ATU C Line Card Glossary 32 Cisco IOS Release 12 1 6 DA ...

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