Cisco Systems 8xDMT Network Router User Manual
Contents
1. This feature supports the 8xDMT line card on the Cisco 6015 Cisco 6160 and Cisco 6260 platforms with NI 2 Table Idetails the total available ADSL modem connections for each chassis Table 1 Number of Available Modem Connections for Each Chassis Number of Available 8xDMT Chassis Slots Total ADSL Modem Connections Cisco 6015 6 48 Cisco 6160 32 256 Cisco 6260 30 240 The 8xDMT is designed for use with the Cisco 6015 Cisco 6160 or Cisco 6260 chassis in one of the following configurations Cisco 6015 Cisco 6160 or Cisco 6260 with a POTS splitter chassis Provisions one modem directly and is physically connected to one specific subscriber line through the POTS splitter chassis Cisco 6015 Cisco 6160 or Cisco 6260 without a POTS splitter chassis Provisions one modem directly and is physically connected to one specific 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 Version 3 0 0X2219BE04 Version 2 2 or OX2019BE2D Version 2 0 should operate similar to the Cisco 677 amp Note A correct firmware version does not gu2. to a higher bit rate The following example configures a downstream monitoring interval of roughly 60 to 150 seconds The upstream monitoring interval is 20 seconds config terminal dsl profile austin dmt rate adaptation interval downshift downstream 10 upstream 20 Command Description dmt rate adaptation enable Turns on rate adaptation dmt rate adaptation margin Sets the SNR margins below which a DMT port retrains to a lower bit rate Cisco IOS Release 12 1 6 DA E Octal Port DMT ATU C Line Card W sdmt rate adaptation margin dmt rate adaptation margin To configure the minimum acceptable SNR margins on a DMT port which force the port to retrain when bad margins exist for the duration of the dmt rate adaptation interval use the dmt rate adaptation margin command in DSL profile configuration mode To disable dmt rate adaptation margin use the no form of this command dmt rate adaptation margin min downstream dB upstream dB Syntax Description min The min keyword specifies that you are configuring the minimum acceptable SNR margins on a port If the port SNR exceeds the configured value the port retrains to a lower bit rate downstream Specifies the minimum acceptable SNR margin for downstream traffic on a port dB SNR margins measured in decibels The valid range is 15 to 15 upstream Specifies the minimum acceptable SNR margin for upstream traffic on a port dB SNR margins measured in dec
3. a lower framing structure than that specified by the ATU C the ATU C falls back to the framing structure 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 Examples In this example the command sets the overhead framing mode in the profile named 8xDMT DSLAM configure terminal DSLAM config dsl profile 8xDMT DSLAM config dsl prof dmt overhead framing mode2 Related Commands Command Description show dsl profile Display a specific profile all ports to which the profile is currently attached and those port settings Cisco IOS Release 12 1 6 DA Octal Port DMT ATU C Line Card dmtrate adaptation enable Ti dmt rate adaptation enable Defaults Command M odes Command History Usage Guidelines Examples Related Commands DMT rate adaptation monitors upstream and downstream DMT ports for signal to noise ratio SNR margins during specified time intervals If an unacceptable SNR margin is detected the port is retrained at a lower bit rate to improve the SNR margins To enable rate adaptation on a DMT port use the dmt rate adaptation enable command at the DSL pr
4. C CBOS Cisco Broadband Operating System Operating System that users access to configure and operate the Cisco products cco Cisco Connection Online chassis The card cage housing where modules are placed Cisco Connection See CCO Online CLI Command Line Interface CPE customer premises equipment CTC Common Transmit Clock D DMT Discrete Multitone Cisco IOS Release 12 1 6 DA EE Octal Port DMT ATU C Line Card Glossary DDTS Cisco Distributed Defect Tracking System digital signal level 3 See DS3 Distributed Defect See DDTS Tracking System DS3 digital signal level 3 Framing specification used for transmitting digital signals at 44 736 Mbps on a T3 facility DSLAM Digital Subscriber Line Access Multiplexer Concentrates and multiplexes digital subscriber line signals at the telephone service provider location to the broadband wide area network Replaces ADSLAM F frame A packet as it is transmitted over a serial line The term derives from character oriented protocols where special start of frame and end of frame characters were added when transmitting packets FTP File 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 dm
5. Octal Port DMT ATU C Line Card This feature module describes the Cisco IOS support for the octal port DMT ATU C 8xDMT line card It includes information on new and modified commands This document includes the following sections Feature Overview page Supported Platforms page 4 Supported Standards MIBs and RFCs page 5 Prerequisites page 6 Configuration Tasks page 6 Configuration Examples page 9 Command Reference page 10 Glossary page 27 Feature Overview The 8xDMT line card provides 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 through DSL profiles Allows single latency Fast or interleaved path selection Supports trellis encoding Supports bit swapping Interoperates with certain CPE For more detailed information see the Supported Platforms section on page 4 amp Note Check with a Cisco customer representative to verify CPE compatibility with the 8xDMT Cisco IOS Release 12 1 6 DA E Octal Port DMT ATU C Line Card HZ Feature Overview Benefits G hs Support ITU G 994 1 G hs support is provided through both
6. 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 minimum bit rate However no alarm occurs when you disable alarms See alarms in the Command Reference for Cisco DSLAMS with NI 2 for more information on enabling and disabling alarms If alarms are enabled for the profile setting the DMT bit rate to 0 disables the associated minimum DMT bit rate alarm Table 2 lists the allowable DMT bit rate ranges and default values Cisco IOS Release 12 1 6 DA E Octal Port DMT ATU C Line Card WE dmt bitrate Table 2 Allowable Ranges and Default Values for DMT Bit Rates Downstream Upstream Aggregate Path Path Aggregate Path Path Configuration Data Range Range Default Range Range Default Parameter Path kbps kbps kbps kbps kbps kbps DMT bit rate max _ Fast 8064 to 32 8064 to 32 10 864 to 32 864 to 0 0 DMT bit rate min Fast 8064 to 32 8064to0 J0 864 to 32 864 to 0 0 DMT bit rate max Interleaved 8064 to 32 8064 to 32 1640 864 to 32 864 to 0 128 DMT bit rate min Interleaved 8064 to 32 8064to0O 128 864 to 0 864 to 0 0 A Caution Examples Related Commands This command causes the port to retrain when you change the value of the bit rate parameter Setting a parameter to its current value does not cause a retrain If a port is training when you change the parameter the port s
7. Port page 7 required Modifying the DSL Profile page 7 optional Preprovisioning the 8xDMT Line Card Starting at the global configuration prompt use the following commands to preprovision a slot for use with the 8xDMT line card Command Purpose Step1 DSLAM config slot 1 ATUC 1 DMT8 This command associates the 8xDMT line card with the specified slot Step2 DSLAM config dsl profile 8xDMT Creates and names the DSL profile 8xDMT in this example Step3 DSLAM config dsl prof exit Return to the global configuration prompt Step4 DSLAM config interface atm1 1 Enter interface configuration mode on the port where you will associate the 8xDMT DSL profile Repeat this process on each port that you wish to associate with a DSL profile Step5 DSLAM config if dsl profile 8xDMT Associates the DSL profile named 8xDMT with atm interface 1 1 Step6 DSLAM config if exit Return to the global configuration prompt p 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 Cisco IOS Release 12 1 6 DA 6 l Octal Port DMT ATU C Line Card Configuration Tasks W Creating and Associating a DSL Profile with Each Port Before starting this configuration task install the 8xDMT line ca
8. T port is monitored for signal to noise ratio SNR margins use the dmt rate adaptation interval command in DSL profile configuration mode To disable dmt rate adaptation interval use the no form of this command dmt rate adaptation interval downshift downstream number of eoc updates upstream seconds Syntax Description downshift The downshift keyword indicates that a line with excessive SNR margins retrains to a lower bit rate downstream The downstream keyword tells IOS to monitor downstream ports for SNR margins exceeding those specified in the dmt rate adaptation margin command number of The number of eoc updates argument specifies the monitoring interval in multiples eoc updates 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 specifies a number of consecutive EOC read events Depending upon the type of CPE EOC messages are sent once every 6 to 15 seconds not counting EOC timeouts Hence a downstream downshift interval value of 10 on CPE reporting margins every 6 seconds results in a 1 minute monitoring interval 10x6 seconds Specifying a downstream downshift interval value of 10 on CPE that report margins every 15 seconds 10x15 seconds yields a 2 5 minute monitoring interval upstream The upstream keyword tells IOS to monito
9. an be used on the NI 2 DSL systems see the Cisco ATM Switch Router Command Reference Guide Cisco IOS Release 12 1 6 DA 10 l Octal Port DMT ATU C Line Card alarms W alarms To enable alarms in profile command mode use the alarms command To disable alarms use the no form of the command alarms Syntax Description This command has no keywords or arguments Defaults Disabled Command Modes Profile configuration Command History Release Modification 12 0 5 DA This command was introduced in a previous release 12 1 6 DA Conditions that cause alarms were added Usage Guidelines The command affects minor alarms for DSL subscriber ports only The alarms this command controls apply to these event classes e Near End LOS Near End interleaved LOCD e Near End fast LOCD e Near End LOF No CPE detected Bit rates below configured minimum Subscriber port failure Upstream or downstream bit rate not above minimum bit rate Enabling or 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 alarm command and relay alarm signals to external systems for audible or v
10. arameters use the dmt bitrate profile configuration command To reset this command to the default value use the no form of this command dmt bitrate maximum fast interleaved downstream dmt bitrate upstream dmt bitrate dmt bitrate minimum fast interleaved downstream dmt bitrate upstream dmt bitrate dmt bitrate The DMT bit rate is given as a multiple of 32 kbps If you enter a nonmultiple of 32 kbps the system rejects and aborts the command See the allowed ranges and default values in Usage Guidelines fast Specify the DMT fast latency path interleaved Specify the DMT interleaved latency path The default no dmt bitrate maximum interleaved sets the maximum downstream and upstream interleaved bit rate to 640 and 128 kbps respectively This command causes the port to retrain The default no dmt bitrate maximum fast sets both the maximum downstream and upstream fastpath bit rates to zero This command causes the port to retrain The default no dmt bitrate minimum interleaved sets both the minimum downstream and upstream interleaved bit rates to zero This command does not 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 Profile configuration Release Modification 12 0 5 DA This command was introduced in a previous release 12 1 5 DA The fast keyword was added
11. arantee interoperation with third party CPE Some hardware variations can affect performance and error rates Test the interoperation of CPE with the 8xDMT in the targeted deployment model before provisioning service Cisco IOS Release 12 1 6 DA 4 l Octal Port DMT ATU C Line Card Supported Standards MIBs andRFCs i Supported Standards MIBs and RFCs Standards e ANSI T1 413 Issue 2 Category 1 only ANSI T1 413 Issue 2 Annex F Reduced NEXT Universal Test amp Operations PHY for ATM Level 2 A standard for transport of ATM cells over a 16 bit parallel data bus See ATM Forum document af phy 0039 000 ITU G 992 1 Annex A G dmt ITUG 992 2 G lite ITU G 994 1 G hs Standard MIBS To obtain lists of supported MIBs by platform and Cisco IOS release and to download MIB modules go to the Cisco MIB web site on Cisco Connection Online CCO at http www cisco com public sw center netmgmt cmtk mibs shtml IETF RFC 1695 Definitions of Managed Objects for ATM Management Version 8 0 using SMIv2 IETF RFC 2662 Definitions of Managed Objects for the ADSL Line obsoletes ADSL Forum TR 006 SNMP based ADSL Line MIB Objects not supported for 8xDMT From Ads LineConfProfileEntry adsl AtucConfRateChanRatio adsl AtucConfMaxSnrM gn adslAtucConfUpshiftSnrMgn adslAturConfRateChanRatio adslAturConfMaxSnrMgn adslAturConfUpshiftSnrMgn adslAturConfMinUpshiftTime Ads LineAlarmConfProfileEn
12. e line rate for message or data transfer from the source machine to a destination machine on the network Also see downstream rate V VC Virtual circuit A logical circuit created to ensure reliable communication between two network devices A virtual circuit is defined by a VPI VCI pair and can be either permanent 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 VPI VPI Virtual path identifier An 8 bit field in the header of an ATM cell The VPI together with the VCI is used to identify the next destination of a cell as it passes through the network See also VCI Cisco IOS Release 12 1 6 DA EE Octal Port DMT ATU C Line Card W Glossary Cisco IOS Release 12 1 6 DA 32s l
13. els The range is 0 to 15 Defaults Downstream 6 dB Upstream 6 dB Command M odes Profile configuration Command History Release Modification 12 0 5 DA This command was introduced Usage Guidelines A 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 Cisco IOS Release 12 1 6 DA E Octal Port DMT ATU C Line Card W dmt minrate blocking dmt minrate blocking To force a port not to retrain when actual bit rates fall below the values configured in the dmt bitrate minimum command use the dmt minrate blocking command To disable dmt minrate blocking use the no form of the command dmt minrate blocking Syntax Description This command has no arguments or keywords 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 M odes DSL profile conf
14. ibels The valid range is 15 to 15 Defaults The default configuration is derived from the no dmt rate adaptation enable command This specifies minimum upstream and downstream SNR margins of 0 dB Command M odes DSL profile configuration Command History Release Modification IOS 12 1 6 DA This command was introduced Usage Guidelines Use the dmt rate adaptation margin command to configure the acceptable SNR margin thresholds on a specified port The dmt rate adaptation margin command works in conjunction with 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 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 affected port to retrain to a higher bit rate Cisco IOS Release 12 1 6 DA 24 l Octal Port DMT ATU C Line Card slot W slot To provision a slot for a specific card type or to change the line coding for a flexi line card use the slot command slot slot cardtype Syntax Description sjor he number of the slot you want to provision The range is to 38 ote The number of slots
15. iguration Command History Release Modification IOS 12 1 6 DA This command was introduced Usage Guidelines To specify the bit rate below which a DMT port will not retrain use the dmt bitrate minimum command Examples The following example describes how to enable dmt minrate blocking configure terminal dsl profile 8xDMT dmt minrate blocking Cisco IOS Release 12 1 6 DA 18s l Octal Port DMT ATU C Line Card dmtoverhead framing W dmt overhead framing Syntax Description Defaults Command M odes Command History Usage Guidelines amp To set the overhead framing mode use the dmt overhead framing command To reset this command to the default value use the no form of this command dmt overhead framing mode0 mode1 mode2 mode3 mode0 Full overhead framing with asynchronous bit to modem timing model Full overhead framing with synchronous bit to modem timing mode2 Reduced overhead framing with separate fast and sync bytes in the fast and interleaved latency buffers respectively mode3 Reduced overhead framing with merged fast and sync bytes using either the fast or interleaved latency buffer Mode3 Profile configuration Release Modification 12 0 5 DA This command was introduced 12 1 6 DA Mode 0 was added Note Conditions on the line and the capabilities of the ATU R CPE affect the achievable value for this parameter As a result the overhead framing value to
16. ing Trellis encoding is a method of providing better performance in a noisy environment The end result of using Trellis encoding is that you can transmit at faster line rates with lower error rates thus providing a faster overall throughput in a moderately noisy environment You can enable or disable trellis encoding for a specific DSL profile Enhanced Line Quality Monitoring and Management The 8xDMT improves the manageability of DMT ports on supported DSLAMs The following commands are used to configure this functionality dmt minrate blocking DMT minrate blocking customizes the DMT port reaction to lines that train below configured minimum bit rates Formerly if a line trained below the configured minimum bit rate threshold it would generate a minor alarm but the DMT port remained active The dmt minrate blocking prevents DMT ports from training when bit rates fall below the configured minimum threshold specified in the dmt bitrate minimum command Cisco IOS Release 12 1 6 DA ae l Octal Port DMT ATU C Line Card Restrictions Feature Overview W amp Note The original option which generates a minor alarm when configured minimum bit rates are not met is configured by default in DSL profiles The default configuration is no dmt minrate blocking dmt rate adaptation The dmt rate adaptation command monitors the signal to noise ratio SNR on DSL lines When enabled software monitors the upstream and down
17. isible alarms However you can track the condition of DSL ports on which alarms are disabled including conditions that ordinarily trigger alarms using the command show dsl interface atm slot port You can suppress minimum bit rate alarms without disabling other alarms for the profile Cisco IOS Release 12 1 6 DA E Octal Port DMT ATU C Line Card W alams amp Note The alarms command has no effect on critical alarms major alarms or minor alarms related to subsystems other than the DSL subscriber ports Examples In this example the command enables alarms for the default profile DSLAM configure terminal 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 Display the current major and minor alarm status if any and display the configuration of the alarm thresholds Cisco IOS Release 12 1 6 DA RARA l Octal Port DMT ATU C Line Card dmt bitrate Syntax Description Defaults Command M odes Command History Usage Guidelines dmtbitrate Hi To set the maximum and minimum allowed bit rates for the fast or interleaved DMT profile p
18. ne card is spectrally 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 The command in this example provisions slot 30 for an 8xDMT line card DSLAM configure terminal DSLAM config slot 30 ATUC 1 DMT8 Command Description show hardware Display information about the physical modules in the chassis E Cisco IOS Release 12 1 6 DA Octal Port DMT ATU C Line Card Glossary W A ADSL Asymmetric Digital Subscriber Line A digital subscriber line DSL technology in which the transmission of data from server to client is much faster than the transmission from the client to the server ADSL Transmission See ATU C Unit central office ADSL Transmission See ATU R Unit remote asymmetric digital See ADSL subscriber line Asynchronous See ATM Transfer Mode AT 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
19. nt value does not cause a retrain If a port is training when you change the parameter the port untrains and retrains to the new parameter Conditions on the line the configured bit rate and the 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 values for the connection Examples In this example the command sets the interleaved FEC check bytes for the default profile to 12 downstream and 6 upstream DSLAM configure terminal DSLAM config dsl profile default DSLAM config dsl prof dmt check bytes interleaved downstream 12 upstream 6 Cisco IOS Release 12 1 6 DA E Octal Port DMT ATU C Line Card WE sdmt check bytes Related Commands None Cisco IOS Release 12 1 6 DA 16s l Octal Port DMT ATU C Line Card dmtmargin W 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 dmt margin Enter the upstream and downstream SNR margins in decib
20. oblem is found loss of signal See 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 A second generation network interface card Stands for permanent virtual connection A fixed virtual connection between two users The public data network equivalent of a leased line No call setup or clearing procedures are needed The path that network traffic takes from its source to its destination The route a datagram may follow can include many gateways and many physical networks In the Internet each datagram is routed separately Cisco IOS Release 12 1 6 DA E Octal Port DMT ATU C Line Card Glossary router A system responsible for making decisions about which of several paths network or Internet traffic will follow To do this it uses a routing protocol to gain information about the network and algorithms to choose the best route based on several criteria known as routing metrics See also bridge routing table Information stored within a router that contains network path and status information It is used to select the most appropriate route to forward information along S Simple Network See SNMP Management Protocol slot A numbered location within a chassis capable of housing a module SNMP Simple Network Management Protocol The network management protocol of choice for TCP IP based inte
21. ocumentation troubleshooting tips and sample configurations from online tools For Cisco com registered users additional troubleshooting tools are available from the TAC website To obtain troubleshooting help go to the Cisco Troubleshooting Assistant web site on Cisco Connection Online CCO at http www cisco com kobayashi support tac tsa dslstep html Also see the Monitoring and Maintaining the 8xDMT Line Card section on page 8 Monitoring and Maintaining the 8xDMT Line Card Use the following commands to monitor and maintain the 8xDMT line card Command Purpose DSLAM show dsl interface atm slot port These commands display basic information about the DSL link including port status dsl statistics line errors and cards detected DSLAM show dsl status DMT DSLAM show facility alarm status The show facility alarm status command displays all of the current major and minor alarms and the user configurable alarm thresholds for temperature After an alarm condition is indicated by LEDs or bells you can use the show facility alarm status command to determine the cause of the alarm Note You must turn on the alarms in the profile for alarms to be displayed DSLAM show hardware The show hardware command shows information on each of the slots in your chassis It tells whether line cards fan trays and PEMs are present Cisco IOS Release 12 1 6 DA eager l Octal Port DMT ATU C Line Card Configu
22. ofile configuration prompt To disable dmt rate adaptation use the no form of the command dmt rate adaptation enable This command has no arguments or keywords Enabling dmt rate adaptation configures the commands dmt rate adaptation interval and dmt rate adaptation margin with their default values For information 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 DSL profile configuration Release Modification IOS 12 1 6 DA This command was introduced If you wish to modify the default configuration of the 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 The following example enables dmt rate adaptation with default interval and margin values config terminal dsl profile austin dmt rate adaptation enable Command Description dmt rate adaptation interval Sets the upstream and downstream time intervals at which a DMT port is monitored for SNR margins dmt rate adaptation margin Sets the SNR values below which the DMT port retrains to a lower bit rate Cisco IOS Release 12 1 6 DA E Octal Port DMT ATU C Line Card Hs dmt rate adaptation interval dmt rate adaptation interval To change the intervals during which a DM
23. r upstream ports for SNR margins exceeding those specified in the dmt rate adaptation margin command seconds The seconds argument specifies the monitoring interval in seconds on an upstream DMT port Defaults Following are the default settings for the dmt rate adaptation interval downstream 10 a Note Remember a downstream value of 10 can yield a monitoring interval between 1 minute to 2 5 minutes in length upstream 10 Command Modes DSL profile configuration Command History Release Modification IOS 12 1 6 DA This command was introduced Cisco IOS Release 12 1 6 DA he ae l Octal Port DMT ATU C Line Card Usage Guidelines L Examples Related Commands dmt rate adaptation interval W Use the dmt rate adaptation interval to specify the frequency at which line margins are checked on a DMT port The dmt rate adaptation interval command works in conjunction with the dmt rate adaptation margin 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 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
24. ration Examples W Configuration Examples The following example shows a profile named 8xDMT2 being created The profile uses the default profile values for any parameters not specified Current configuration 7019 bytes 1 version 12 1 no service pad service timestamps debug uptime service timestamps log uptime no service password encryption hostname DSLAM boot system flash 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 1 1 1 I 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 model dmt check bytes fast downstream 12 upstream 6 dmt margin downstream 12 upstream 6 dmt bitrate maximum fast downstream 3200 upstream 640 dmt bitrate maximum interleaved downstream 0 upstream 0 network clock select 1 system ip subnet zero ip host routing no ip finger Cisco IOS Release 12 1 6 DA E Octal Port DMT ATU C Line Card HZ Command Reference Command Reference This section documents 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 c
25. rd Refer to the Octal Port DMT ATU C Line Card FRU Installation and Configuration Notes for information on installing the 8xDMT line card Starting at the global configuration prompt use the following procedure to associate a DSL profile with a port Command Purpose Step1 DSLAM config dsl profile 8xDMT Select the profile that you want to attach to the selected port The profile name 8xDMT is used as an example Step2 DSLAM config dsl prof exit Return to the global configuration prompt Step3 DSLAM config interface atm1 1 Enter interface configuration mode on the port where you will associate the 8xDMT DSL profile Repeat this process on each port that you wish to associate with a DSL profile Step4 DSLAM config if dsl profile 8xDMT Associate the DSL profile 8xDMT with atm interface 1 1 Step5 DSLAM config if exit Return to the global configuration prompt Verifying the DSL Profiles You can use the show dsl profile profile name command to verify that a DSL profile is attached to a port You can also use the show running configuration command to verify that the DSL profile is associated with a port Tips If no DSL profile appears in the show running configuration command output the default DSL profile is enabled See the Command Reference section on page 10 for the default configuration values Modifying the DSL Profile Starting at the global configuration prompt use the following procedu
26. re to modify the default bit rate signal to noise ratio DMT check bytes and overhead framing parameters in your DSL profile A 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 Step1 DSLAM config dsl profile 8xDMT Enter DSL profile configuration mode Step2 DSLAM config dsl profile dmt bitrate Set a DMT bit rate of 3200 kbps downstream and 640 kbps maximum fast downstream 3200 upstream 640 yhstream on the fast path Automatically configures the interleaved path to 0 kbps Cisco IOS Release 12 1 6 DA a Octal Port DMT ATU C Line Card W Monitoring and Maintaining the 8xDMT Line Card Command Purpose Step3 DSLAM config dsl profile dmt Set the upstream and downstream FEC check redundancy bytes check bytes fast downstream 0 upstream 0 to 0 Step4 DSLAM config dsl profile dmt margin Set the downstream and upstream signal to noise ratio SNR downstream 12 upstream 6 margins for a DSL profile Step 5 DSLAM config dsl profile dmt Set the overhead framing mode in this example to 1 overhead framing model Step6 DSLAM config dsl profile exit Return to the global configuration prompt Troubleshooting Tips Cisco provides Cisco com as a starting point for all technical assistance Customers and partners can obtain d
27. rnets SVC Stands for switched virtual connection A temporary virtual connection between two users T TCP Transmission Control Protocol The major transport protocol in the Internet 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 simplified version of FTP that is often used to boot diskless workstations and other network devices such as routers over a network typically a LAN Has no password security training The procedure used by the ATU C and ATU R to establish an end to end ADSL connection training mode Characteristic of a router that allows it to use RADSL technology to adjust its line speed according to noise conditions on the transmission line Transmission See TCP Control Protocol Trivial File Transfer See TFTP Protocol trellis encoding A channel coding technique which provides forward error correction capability twisted pair Two insulated copper wires twisted together with the twists or lays varied in length to reduce potential signal interference between the pairs Cisco IOS Release 12 1 6 DA ENJE l Octal Port DMT ATU C Line Card Glossary W U upstream rate Th
28. stream DMT ports for low SNR margins When the actual upstream or downstream margin falls below the dmt rate adaptation margin for the duration of the configured rate adaptation interval the line drops and attempts to retrain If the line is able to retrain it trains to a lower bit rate with improved SNR margins The 8xDMT card is 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 4x DMT 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 the World Wide Web at http www cisco com univercd cc td doc product dsl_prod index htm Softw are Documents A complete list of all DSL IOS software product related documentation is available on the World Wide Web at http www cisco com univercd cc td doc product dsl_prod ios_dsl index htm In the ATM software product related documentation look for information pertaining to the Cisco LightStream 1010 which uses the same software base as the NI 2 DSL systems This documentation is available on the World Wide Web at http www cisco com univercd cc td doc product atm index htm Cisco IOS Release 12 1 6 DA Octal Port DMT ATU C Line Card W Supported Platforms Supported Platforms DSLAMs
29. t and G lite Also known as G hs G 997 1 The ITU standard for performance monitoring on DMT access technologies G dmt Pseudonym for G 992 1 G hs Pseudonym for G 994 1 HandShake hs G lite Pseudonym for G 992 2 H Handshake Part of the procedure to set up a data communications link The handshake can be part of the protocol itself or an introductory process The computers wishing to talk to each other set out the conditions they can operate under Sometimes the handshake is just a warning that a communication is imminent l IP Internet Protocol The network layer protocol for the Internet Protocol suite E Cisco IOS Release 12 1 6 DA Octal Port DMT ATU C Line Card IP address ITU LCD LODS LOF loopback LOS M Management Information Base MIB NI 2 PVC route Glossary W The 32 bit address assigned to hosts that want to participate in a TCP IP Internet The International Telecommunications Union a telecommunications standards body Loss of Cell Delineation Loss Of Delay Synchronization Loss Of Frame A diagnostic test that returns the transmitted signal back to the sending device after it has passed through a network or across a particular link The returned signal can then be compared to the transmitted one The discrepancies between the two help to trace the fault When trying to locate a faulty piece of equipment loopbacks will be repeated eliminating satisfactory machines until the pr
30. the MIB and the CLI Features from G hs that are supported include Enabling disabling all or one of the following modes G dmt 11 413 Issue 2 Gllite Setting auto mode defers the mode selection to the ATU R Displaying current mode capability Bit Swapping Bit swapping is a mechanism that allows DMT transceivers to reallocate bits between carriers and adjust gain scaling based on the carrier SNR margin Fast or Interleaved Path Selection The fast path feature allows you to configure either the fast or the interleave path via DSL profile configuration commands provided that the CPE also supports fast path You can use either the interleave or fast path with the 8xDMT line card provided that the CPE also supports fast path The fast path provides improved latency characteristics for applications that cannot tolerate latency for example voice The parameters for either path are configurable using the DSL profile configuration commands Note that although you can configure both paths only one path will actually be 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 Trellis Encod
31. tops training and retrains to the new parameter In this example the command sets the maximum interleaved bit rate of the default profile to 3200 kbps downstream and 640 kbps upstream DSLAM configure terminal DSLAM config dsl profile default DSLAM config dsl prof dmt bitrate maximum interleaved downstream 3200 upstream 640 Command Description show dsl profile Display a specific profile all ports to which the profile is currently attached and those port settings E Cisco IOS Release 12 1 6 DA Octal Port DMT ATU C Line Card dmtcheck bytes W dmt check bytes To set upstream and downstream FEC check redundancy bytes use the dmt checkbytes profile configuration command To reset this command to the default value use the no form of this command dmt check bytes fast interleaved downstream bytes upstream bytes Syntax Description bytes Enter the upstream and downstream FEC check bytes The allowed values are 0 2 4 6 8 10 12 14 and 16 fast Specify the DMT fast latency path interleaved Specify the DMT interleaved latency path Defaults Downstream 16 Upstream 16 Command Modes Profile configuration Command History Release Modification 12 0 5 DA This command was introduced 12 1 6 DA The fast keyword was added Usage Guidelines A Caution This command causes the port to retrain when you change the check bytes parameter Setting a parameter to its curre
32. try ADSL Forum TR 014 DMT Line Code Specific MIB Objects not supported for 8xDMT From Ads lLineDmtConfProfileEntry ads AtucDmtConfFreqBins adslAturDmtConfFreqBins adslAtucDmtConfInterleavePath adslAtucDmtConfFastPath adslAturDmtConfInterleavePath adslAturDmtConfFastPath Cisco Derived MIBS CISCO ADSL LINE MIB Objects not supported for DMT8 CISCO ADSL DMT LINE MIB Objects not supported for DMTS8 From the cAdsIDmtLineConfProfileGroup cAdslAtucDmtConfBitS wapEnabled cAdslAtucDmtConfBitS wapFrom cAdslAtucDmtConfBitSwapTo You can set these objects via SNMP however the 8xDMT cards will ignore these objects when provisioning ports for service To obtain lists of supported MIBs by platform and Cisco IOS release and to download MIB modules go to the Cisco MIB web site on Cisco Connection Online CCO at http www cisco com public sw center netmgmt cmtk mibs shtml Cisco IOS Release 12 1 6 DA Octal Port DMT ATU C Line Card W Prerequisites Prerequisites To use the 8xDMT feature you must have one of the following DSLAMs with the 8xDMT line card and IOS 12 1 6 or above installed Cisco 6015 Cisco 6160 Cisco 6260 Configuration Tasks See the following sections for configuration tasks for the 8xDMT feature Each task in the list indicates if the task is optional or required Preprovisioning the 8xDMT Line Card page 6 optional Creating and Associating a DSL Profile with Each
33. varies by chassis The Cisco 6130 has 38 slots the Cisco 6160 has 34 slots and the Cisco 6260 has 32 slots cardtype he line card type for which you want to configure the slot The alid card types are ATUC 1 4DMT 4 port DMT card ATUC 1 4DMT I 4 port DMT over ISDN card e 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 e STUC 4 2B1Q DIR 1 4 port SDSL card ote Some line cards do not function in all NI 2 DSL systems For example the Cisco 6100 system supports only a dual port CAP ATU C line card Consult the hardware documentation for your DSL system to determine which line cards it supports Defaults None Command M odes Global configuration Command History Release Modification 12 0 5 DA This command was introduced 12 1 1 DA New card types were added 12 1 6 DA New card types were added Cisco IOS Release 12 1 6 DA E Octal Port DMT ATU C Line Card E siot Usage Guidelines Examples Related Commands Use the slot command to provision a slot for a line card Card mismatch error conditions include the following A line card is already installed in the specified slot The specified slot contains one type of card but is provisioned for another type If you attempt to provision an empty slot the major alarm MODULE MISSING asserts The 8xDMT li
34. which the line trains may not be the same as the value you configure There are two types of ADSL 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 e Mode 0 Full overhead framing with asynchronous bit to modem timing an enabled synchronization control mechanism e Mode 1 Full overhead framing with synchronous bit to modem timing a disabled synchronization control mechanism Cisco IOS Release 12 1 6 DA E Octal Port DMT ATU C Line Card W dmt overhead framing Mode 2 Reduced overhead framing with separate fast and sync bytes in the fast and interleaved latency buffers respectively Mode 3 Reduced overhead framing with merged fast and sync bytes using either the fast or interleaved latency buffer Note Mode 3 is recommended for use on DMT interfaces adhering to the ANSI T1 413 Issue 2 standard Mode 3 is required for flexi line card DMT interfaces The number of overhead bytes per frame varies according to the overhead framing mode and the operating mode as shown in Table 3 Table 3 Overhead Bytes per Frame Overhead Bytes T1 413 and G992 1 G992 2 Framing Mode Downstream Upstream Downstream Upstream Mode 0 4 3 N A N A Mode 1 3 3 N A N A Mode 2 2 2 N A N A Mode 3 1 1 1 1 If during the training sequence the ATU R indicates
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