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.
Octal-Port DMT ATU-C Line Card Feature Overview Benefits G.hs Support (ITU G.994.1) G.hs support is provided through both the MIB and the CLI. Features from G.hs that are supported include: • Enabling/disabling all or one of the following modes. – G.dmt – T1.413 Issue 2 – G.lite • Setting auto mode defers the mode selection to the ATU-R. • Displaying current mode/capability.
Octal-Port DMT ATU-C Line Card Feature Overview 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 downstream DMT ports for low SNR margins.
Octal-Port DMT ATU-C Line Card Supported Platforms Supported Platforms DSLAMs This feature supports the 8xDMT line card on the Cisco 6015, Cisco 6160, and Cisco 6260 platforms with NI-2. Table 1details the total available ADSL modem connections for each chassis.
Octal-Port DMT ATU-C Line Card Supported Standards, MIBs, and RFCs Supported Standards, MIBs, and RFCs Standards • ANSI T1.413-Issue 2, Category 1 only • ANSI T1.413-Issue 2, Annex F (Reduced NEXT) • Universal Test & 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) • ITU G.992.2. (G.lite) • ITU G.994.1. (G.
Octal-Port DMT ATU-C Line Card 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.
Octal-Port DMT ATU-C Line Card Configuration Tasks Creating and Associating a DSL Profile with Each Port Before starting this configuration task, install the 8xDMT line card. Refer to the Octal-Port DMT ATU-C Line Card FRU Installation and Configuration Notes for information on installing the 8xDMT line card.
Octal-Port DMT ATU-C Line Card Monitoring and Maintaining the 8xDMT Line Card Command Purpose Step 3 DSLAM(config-dsl-profile)# dmt check-bytes fast downstream 0 upstream 0 Set the upstream and downstream FEC check (redundancy) bytes to 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.
Octal-Port DMT ATU-C Line Card Configuration Examples 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 ! 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.
Octal-Port DMT ATU-C Line Card 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 can be used on the NI-2 DSL systems, see the Cisco ATM Switch Router Command Reference Guide. Cisco IOS Release 12.
Octal-Port DMT ATU-C Line Card alarms 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.
Octal-Port DMT ATU-C Line Card alarms Note Examples The alarms command has no effect on critical alarms, major alarms, or minor alarms related to subsystems other than the DSL subscriber ports. 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.
Octal-Port DMT ATU-C Line Card dmt bitrate dmt bitrate To set the maximum and minimum allowed bit rates for the fast or interleaved DMT profile parameters, use the dmt bitrate profile configuration command. To reset this command to the default value, use the no form of this command.
Octal-Port DMT ATU-C Line Card dmt bitrate Table 2 Allowable Ranges and Default Values for DMT Bit Rates Downstream Configuration Parameter Data Path Aggregate Range (kbps) DMT bit rate max Fast DMT bit rate min Upstream Aggregate Range (kbps) Path Range (kbps) Path Default (kbps) 8064 to 32 8064 to 32 0 864 to 32 864 to 0 0 Fast 8064 to 32 8064 to 0 864 to 32 864 to 0 0 DMT bit rate max Interleaved 8064 to 32 8064 to 32 640 864 to 32 864 to 0 128 DMT bit rate min Interleaved 80
Octal-Port DMT ATU-C Line Card dmt check-bytes 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 Defaults bytes Enter the upstream and downstream FEC check bytes. The allowed values are 0, 2, 4, 6, 8, 10, 12, 14, and 16.
Octal-Port DMT ATU-C Line Card dmt check-bytes Related Commands None. Cisco IOS Release 12.
Octal-Port DMT ATU-C Line Card dmt margin 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 Defaults Downstream: 6 dB Enter the upstream and downstream SNR margins in decibels. The range is 0 to 15. Upstream: 6 dB Command Modes Profile configuration.
Octal-Port DMT ATU-C Line Card 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.
Octal-Port DMT ATU-C Line Card dmt overhead-framing dmt overhead-framing 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} Syntax Description mode0 Full overhead framing with asynchronous bit-to-modem timing. mode1 Full overhead framing with synchronous bit-to-modem timing.
Octal-Port DMT ATU-C Line Card 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. 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.
Octal-Port DMT ATU-C Line Card dmt rate-adaptation enable dmt rate-adaptation enable 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 profile configuration prompt.
Octal-Port DMT ATU-C Line Card dmt rate-adaptation interval dmt rate-adaptation interval To change the intervals during which a DMT 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.
Octal-Port DMT ATU-C Line Card dmt rate-adaptation interval Usage Guidelines Note Examples 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.
Octal-Port DMT ATU-C Line Card dmt 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.
Octal-Port DMT ATU-C Line Card slot 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 slot# The number of the slot you want to provision. The range is 1 to 38. The number of slots varies by chassis. The Cisco 6130 has 38 slots, the Cisco 6160 has 34 slots, and the Cisco 6260 has 32 slots. Note cardtype The line card type for which you want to configure the slot.
Octal-Port DMT ATU-C Line Card slot Usage Guidelines 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.
Octal-Port DMT ATU-C Line Card Glossary Glossary 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 Unit—central office See ATU-C. ADSL Transmission Unit—remote See ATU-R. asymmetric digital subscriber line See ADSL. Asynchronous Transfer Mode See ATM. ATM Asynchronous Transfer Mode.
Octal-Port DMT ATU-C Line Card Glossary Cisco Distributed Defect Tracking System. DDTS digital signal level 3 See DS3. Distributed Defect Tracking System See DDTS. 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.
Octal-Port DMT ATU-C Line Card Glossary IP address The 32-bit address assigned to hosts that want to participate in a TCP/IP Internet. ITU The International Telecommunications Union; a telecommunications standards body. L LCD Loss of Cell Delineation LODS Loss Of Delay Synchronization LOF Loss Of Frame. loopback 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.
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.
Octal-Port DMT ATU-C Line Card Glossary U upstream rate The 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.
Octal-Port DMT ATU-C Line Card Glossary Cisco IOS Release 12.
