Table Of Contents
1-Port ADSL WAN Interface Card for Cisco 2600 Series and Cisco 3600 Series Routers
Supported Standards, MIBs, and RFCs
Configuring the ADSL Port on the ADSL WAN Interface Card
VoATM over AAL2 on the ATM Interface Example
VoATM over AAL5 on the ATM Interface Example
1-Port ADSL WAN Interface Card for Cisco 2600 Series and Cisco 3600 Series Routers
Feature History
This document describes the 1-port Asymmetric Digital Subscriber Line (ADSL) WAN Interface Card (WIC) (WIC-1ADSL) feature for Cisco 2600 series and Cisco 3600 series routers in Cisco IOS Release 12.2(4)T. It describes the benefits of the new feature, supported platforms, configuration, related documents, and provides command reference information.
This document includes the following sections:
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Supported Standards, MIBs, and RFCs
Feature Overview
The ADSL WAN interface card is a 1-port WAN interface card (WIC) for the Cisco 2600 series and Cisco 3600 series routers. The card provides asymmetric digital subscriber line (ADSL) high-speed digital data transfer between a single customer premises equipment (CPE) subscriber and the central office.
The ADSL WIC is compatible with the Alcatel Digital Subscriber Loop Access Multiplexer (DSLAM) and the Cisco 6130, Cisco 6160, and Cisco 6260 DSLAMs with Flexi-line cards. It supports Asynchronous Transfer Mode (ATM) Adaptation Layer 2 (AAL2) and AAL5 for the Cisco 2600 series and Cisco 3600 series platforms for both voice and data service.
The general topology is shown in Figure 1.
Figure 1 General Topology for ADSL WIC
Note
ADSL is a last-mile access technology, which has an asymmetrical data rate running over a single copper wire pair.
Benefits
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Enables business class broadband service with voice integration, scalable performance, flexibility, and security.
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Aggregates both ADSL and other transport options into a single box.
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Provides both POTS and ADSL high-speed digital data transmissions between the customer premises equipment (CPE) and the central office (CO).
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Supports ITU G.992.1 (or G.DMT, which specifies full-rate ADSL).
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Supports and complies with ANSI T1.413 issue 2, and ITU G.992.1 (G.DMT for full-rate ADSL).
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Supports ATM AAL2 and AAL5 services on the Cisco 2600 series and Cisco 3600 series platforms.
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Supports applications (including VoATM voice), ATM class of service (variable bit rate-nonreal time [VBR-NRT], variable bit rate-real time [VBR-rt], and unspecified bit rate [UBR]) and up to 23 virtual circuits on a WIC.
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Provides ATM traffic management to enable service providers to manage their core ATM network infrastructures.
Restrictions
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The ADSL WAN interface card does not support dual latency. When the ADSL link is intended to support both voice and data traffic simultaneously, the link should be configured for either all fast-path data or all interleave data with an interleave depth of zero to insure that latency is minimized. In addition, the total supported data rate must be reduced to adjust for the reduced coding gain, which is usually present with high-latency traffic.
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The ADSL WAN interface card does not support available bit rate (ABR) class of service (CoS).
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For the Cisco 2600 series routers, the ADSL WAN interface card should be inserted only into on-board WIC slots or 2W network modules. This card does not function properly in older network modules.
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For the Cisco 3600 series routers, the ADSL WAN interface card should be inserted only into on-board WIC slots or 2W, 1FE2W, 2FE2W, or 1FE1R2W network modules. This card does not function properly in older network modules.
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When using AAL2, analog voice is not supported. Voice calls should come through a digital voice card, such as the NM-HDV.
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VoATM is supported in both AAL2 and AAL5 modes on the Cisco 2600 series and Cisco 3600 series.
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VoATM AAL2 and AAL5 are supported only if voice and data use separate permanent virtual circuits (PVCs).
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VoATM AAL2 supports digital voice (T1/E1) only, while VoATM AAL5 supports both analog and digital voice.
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VoIP is not supported unless the ADSL WIC carries only voice traffic (with no data). The QoS features necessary for VoIP and data sharing the same PVC, or different PVCs on the same interface, are not supported yet. These features include LLQ, LFI, and tx-ring tuning.
Related Documents
For more information about voice configuration, see the following Cisco IOS Release 12.2 guides:
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Cisco IOS Voice, Video, and Fax Configuration Guide, Release 12.2
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Cisco IOS Voice, Video, and Fax Command Reference, Release 12.2
The following configuration guides describe the configuration of IP and ATM:
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For more information about configuring IP, see the Cisco IOS IP Configuration Guide, Release 12.2.
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For more information about configuring ATM, see "Configuring ATM" in the Wide-Area Networking Configuration Guide, Release 12.2.
The following online feature documentation and installation guides describe the configuration and installation of hardware components:
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For information about installing Cisco 2600 series hardware, see the documents listed at the following URL:
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/cis2600/index.htm•
For information about installing Cisco 3600 series hardware, see the documents listed at the following URL:
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/cis3600/index.htmSupported Platforms
This feature is supported on the following platforms:
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Cisco 2600 series
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Cisco 3600 series
Determining Platform Support Through Feature Navigator
Cisco IOS software is packaged in feature sets that support specific platforms. To get updated information regarding platform support for this feature, access Feature Navigator. Feature Navigator dynamically updates the list of supported platforms as new platform support is added for the feature.
Feature Navigator is a web-based tool that enables you to quickly determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image.
Feature Navigator is updated regularly when major Cisco IOS software releases and technology releases occur. For the most current information, go to the Feature Navigator home page at the following URL:
Supported Standards, MIBs, and RFCs
Standards
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Supports ITU-T G.991.2 (SHDSL).
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Supports ADSL features ANSI T1.413 issue 2.
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Supports ITU 992.1 (G.DMT).
MIBs
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No new or modified MIBs are supported by this feature.
To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB website on Cisco.com at the following URL:
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml
RFCs
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No new or modified RFCs are supported by this feature.
Prerequisites
A 1-Port ADSL WIC must be installed in the router to match the DSL service to be configured.
Configuration Tasks
See the following sections for configuration tasks for this feature. Each task in the list is identified as either required or optional:
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Configuring the ADSL Port on the ADSL WAN Interface Card (required)
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Verifying ATM Configuration (optional)
Features used on the ADSL WAN interface card must also be configured on the DSLAM. See the documentation for the specific DSLAM for information about configuring features.
Configuring the ADSL Port on the ADSL WAN Interface Card
To configure an ADSL port on the ADSL WAN interface card, complete the following steps:
Verifying ATM Configuration
Use the following commands to verify configuration:
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To verify current configuration and to view the status for all controllers, use the show running-config command.
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To view ATM controller statistics, use the show controllers atm slot/port command.
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To verify the PVC status, use the show atm vc command. Make sure that active PVCs are up.
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To help identify ATM related events as they are generated, use the debug atm events command.
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To indicate what interfaces are having trouble, use the debug atm errors command.
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To identify an entry for the ATM interface you configured and to show an entry for the ATM slot/port you configured, use the show ip route command.
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To display the configured list of ATM static maps to remote hosts on an ATM network, use the show atm map command.
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To view the status of ATM interface, use the show interface atm slot/port command. Make sure that ATM slot/port and line protocol is up, as shown in the following example:
Router# show interface atm1/0ATM1/0 is up, line protocol is upHardware is DSLSAR (with Alcatel ADSL Module)MTU 4470 bytes, sub MTU 4470, BW 800 Kbit, DLY 2560 usec,reliability 255/255, txload 1/255, rxload 1/255Encapsulation ATM, loopback not setKeepalive not supportedEncapsulation(s):AAL5 AAL2, PVC mode24 maximum active VCs, 256 VCs per VP, 2 current VCCsVC idle disconnect time:300 secondsLast input never, output 00:00:01, output hang neverLast clearing of "show interface" counters 03:16:00Queueing strategy:fifoOutput queue 0/40, 0 drops; input queue 0/75, 0 drops30 second input rate 0 bits/sec, 0 packets/sec30 second output rate 0 bits/sec, 0 packets/sec2527 packets input, 57116 bytes, 0 no bufferReceived 0 broadcasts, 0 runts, 0 giants, 0 throttles0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort10798 packets output, 892801 bytes, 0 underruns0 output errors, 0 collisions, 0 interface resets0 output buffer failures, 0 output buffers swapped outRouter# show atm vcVCD / Peak Avg/Min BurstInterface Name VPI VCI Type Encaps SC Kbps Kbps Cells Sts1/0.3 2 9 36 PVC MUX UBR 800 UP1/0.2 1 9 37 PVC SNAP UBR 800 UPRouter# show controllers atm 1/0Interface ATM1/0 is upHardware is DSLSAR (with Alcatel ADSL Module)IDB: 62586758 Instance:6258E054 reg_dslsar:3C810000 wic_regs:3C810080PHY Inst:62588490 Ser0Inst:62573074 Ser1Inst: 6257CBD8 us_bwidth:800Slot: 1 Unit: 1 Subunit: 0 pkt Size:4496VCperVP:256 max_vp: 256 max_vc: 65536 total vc:2rct_size:65536 vpivcibit:16 connTblVCI:8 vpi_bits:8vpvc_sel:3 enabled: 0 throttled:0WIC Register Value Notes--------------- ---------- ----------FPGA Dev ID (LB) 0x44 'D'FPGA Dev ID (UB) 0x53 'S'FPGA Revision 0x99WIC Config Reg 0x45 WIC / VIC select = WIC;CTRLE addr bit 8 = 1;OK LED on;LOOPBACK LED off;CD LED on;WIC Config Reg2 0x07 Gen bus error on bad ADSL accessInt 0 Enable Reg 0x03 ADSL normal interrupt enabledADSL error interrupt enabledConfiguration Examples
This section provides the following configurationexamples:
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VoATM over AAL2 on the ATM Interface Example
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VoATM over AAL5 on the ATM Interface Example
VoATM over AAL2 on the ATM Interface Example
The following example shows a Cisco 2600 series router configured for VoATM over AAL2 on the ATM interface with an ADSL card:
Router#version 12.2service timestamps debug uptimeservice timestamps log uptimeno service password-encryption!hostname host1!memory-size iomem 10voice-card 1!ip subnet-zeroip host host2 225.255.255.224!no mgcp timer receive-rtcpcall rsvp-sync!!controller T1 1/0framing esflinecode b8zsds0-group 0 timeslots 1 type e&m-wink-startds0-group 1 timeslots 2 type e&m-wink-start...ds0-group 23 timeslots 24 type e&m-wink-start!controller T1 1/1framing esflinecode b8zs!interface Ethernet0/0ip address 1.6.46.119 255.255.255.224half-duplexno cdp enable!interface Serial0/0no ip addressshutdown!interface ATM0/1ip address 10.1.1.1 255.0.0.0load-interval 30atm vc-per-vp 256no atm ilmi-keepalivepvc 10/100vbr-rt 672 672 512encapsulation aal2!pvc 10/200protocol ip 10.1.1.2 broadcastencapsulation aal5snap!dsl operating-mode ansi-dmtno fair-queue!interface Ethernet0/1no ip addressshutdown!ip classlessip route 223.255.254.254 255.255.255.224 Ethernet0/0no ip http server!!snmp-server engineID local 000000090200003080477F20snmp-server manager!voice-port 1/0:0local-alertingtimeouts wait-release 3connection trunk 3001!voice-port 1/0:1local-alertingtimeouts wait-release 3connection trunk 3002...voice-port 1/0:23local-alertingtimeouts wait-release 3connection trunk 3024shutdown!dial-peer cor custom!dial-peer voice 3001 voatmdestination-pattern 3001called-number 4001session protocol aal2-trunksession target ATM0/1 pvc 10/100 31codec aal2-profile ITUT 1 g711ulawno vad!dial-peer voice 3002 voatmdestination-pattern 3002called-number 4002session protocol aal2-trunksession target ATM0/1 pvc 10/100 32codec aal2-profile custom 100 g726r32no vad!dial-peer voice 3003 voatmdestination-pattern 3003called-number 4003session protocol aal2-trunksession target ATM0/1 pvc 10/100 33codec aal2-profile ITUT 7 g729abr8no vad...dial-peer voice 3024 voatmdestination-pattern 3024called-number 3024session protocol aal2-trunksession target ATM0/1 pvc 10/100 54codec aal2-profile ITUT 7 g729abr8no vad!dial-peer voice 1 potsdestination-pattern 4001port 1/0:0!dial-peer voice 2 potsdestination-pattern 4002port 1/0:1...dial-peer voice 24 potsdestination-pattern 4024port 1/0:23!line con 0exec-timeout 0 0transport input noneline aux 0line vty 0 4login!no scheduler allocateendVoATM over AAL5 on the ATM Interface Example
The following example shows a Cisco 2600 series router configured for VoATM over AAL5 on the ATM interface with an ADSL card.
Router#version 12.2no service single-slot-reload-enableservice timestamps debug uptimeservice timestamps log uptimeno service password-encryption!hostname u2621!no logging bufferedno logging bufferedlogging rate-limit console 10 except errors!memory-size iomem 15voice-card 1!ip subnet-zero!no ip fingerno ip domain-lookup!no mgcp timer receive-rtcpcall rsvp-sync!controller T1 1/0framing esflinecode b8zsds0-group 0 timeslots 1-24 type e&m-wink-start!controller T1 1/1!!interface ATM0/0ip address 12.0.0.1 255.255.255.224load-interval 30atm vc-per-vp 256no atm ilmi-keepalivedsl operating-mode autono fair-queue!!interface FastEthernet0/0ip address 1.7.73.1 255.255.255.224duplex autospeed auto!!interface FastEthernet0/1ip address 192.168.2.1 255.255.255.224load-interval 30duplex autospeed auto!ip classlessip route 223.255.254.0 255.255.255.224 FastEthernet0/0no ip http server!!snmp-server engineID local 0000000902000002163DB260snmp-server packetsize 4096snmp-server manager!voice-port 1/0:0!dial-peer cor custom!!dial-peer voice 5 potsdestination-pattern 777...port 1/0:0prefix 777!!dial-peer voice 100 voatmdestination-pattern 888....session target atm0/0 pvc 0/72!!line con 0exec-timeout 0 0transport input noneline aux 0line vty 0 4login!endCommand Reference
This section documents modified commands for configuring the ADSL WAN Interface Card feature. All other commands used to configure the ADSL WAN Interface Card feature are documented in the Cisco IOS Release 12.2 command reference publications.
dsl operating-mode (ADSL)
CautionThis command is for testing or lab environments only. Using a configuration other than the default configuration for the DSL operating mode can lead to unpredictable behavior on the ADSL line.
To modify the operating mode of the digital subscriber line for an ATM interface, use the dsl operating-mode command in interface mode. To disable, use the no form of the dsl operating-mode command.
dsl operating-mode { auto | ansi-dmt | itu-dmt | splitterless }
no dsl operating-mode { auto | ansi-dmt | itu-dmt | splitterless}
Syntax Description
Defaults
The default operating mode is auto.
Command Modes
Interface
Command History
Usage Guidelines
This configuration command applies to a specific ATM interface. The interface to which it applies must be specified before using the command.
This command is only supported when the 1-Port ADSL WAN Interface Card is installed.
Examples
Router# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Router(config)# interface atm 0/0Router(config-if)# dsl operating-mode autoRouter(config-if)# endRouter#Related Commands
show diag
To specify detailed diagnostic options for displaying the memory on an ADSL-WIC and the ADSL line training log, use the show diag command in EXEC mode.
show diag wic-slot-num {mem start_address end_address | log}
Syntax Description
Command Elements Descriptionwic-slot-num
WIC slot number 0 or 1.
mem start_address end_address
Displays the contents of ADSL-WIC memory.
log
Displays the ADSL line training log.
Command Modes
EXEC
Command History
The following examples show the use of the show diag wic-slot-num command on Cisco 1700 series routers.
Router# show diag wic-slot-numSlot 0:C2621 2FE Mainboard Port adapter, 4 portsPort adapter is analyzedPort adapter insertion time unknownEEPROM contents at hardware discovery:Hardware Revision :1.2PCB Serial Number :JAB041709PU (3653006624)Part Number :73-3200-07RMA History :00RMA Number :0-0-0-0Board Revision :B0Deviation Number :0-22418EEPROM format version 4EEPROM contents (hex):0x00:04 FF 40 00 A2 41 01 02 C1 18 4A 41 42 30 34 310x10:37 30 39 50 55 20 28 33 36 35 33 30 30 36 36 320x20:34 29 82 49 0C 80 07 04 00 81 00 00 00 00 42 420x30:30 80 00 00 57 92 FF FF FF FF FF FF FF FF FF FF0x40:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x50:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x60:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x70:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FFWIC Slot 0:DSL SAR (ADSL)Hardware Revision :1.0Part Number :73-4771-05Board Revision :A0Deviation Number :0-0Fab Version :02PCB Serial Number :JAB0437IDPROM FIELD FORMAT ERROR, index 0x22EEPROM format version 4EEPROM contents (hex):0x00:04 FF 40 00 2E 41 01 00 82 49 12 A3 05 42 41 300x10:80 00 00 00 00 02 02 C1 8B 4A 41 42 30 34 33 370x20:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000x30:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000x40:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000x50:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000x60:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000x70:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00WIC Slot 1:DSL SAR (ADSL)Hardware Revision :1.0Part Number :73-4771-05Board Revision :A0Deviation Number :0-0Fab Version :02PCB Serial Number :JAB0437IDPROM FIELD FORMAT ERROR, index 0x22EEPROM format version 4EEPROM contents (hex):0x00:04 FF 40 00 2E 41 01 00 82 49 12 A3 05 42 41 300x10:80 00 00 00 00 02 02 C1 8B 4A 41 42 30 34 33 370x20:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000x30:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000x40:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000x50:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000x60:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000x70:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00Slot 1:High Density Voice Port adapterPort adapter is analyzedPort adapter insertion time unknownEEPROM contents at hardware discovery:Hardware Revision :1.0Top Assy. Part Number :800-03567-01Board Revision :A0Deviation Number :0-0Fab Version :02PCB Serial Number :JAB033500T5RMA Test History :00RMA Number :0-0-0-0RMA History :00EEPROM format version 4EEPROM contents (hex):0x00:04 FF 40 00 CC 41 01 00 C0 46 03 20 00 0D EF 010x10:42 41 30 80 00 00 00 00 02 02 C1 8B 4A 41 42 300x20:33 33 35 30 30 54 35 03 00 81 00 00 00 00 04 000x30:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x40:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x50:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x60:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x70:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FFVIC Slot 0:T1 (2 Port) Multi-Flex Trunk (Drop&Insert) WAN Daughter CardHardware revision 1.0 Board revision B0Serial number 17216762 Part number 800-04614-01Test history 0x0 RMA number 00-00-00Connector type PCIEEPROM format version 1EEPROM contents (hex):0x20:01 24 01 00 01 06 B4 FA 50 12 06 01 00 00 00 000x30:58 00 00 00 99 11 15 00 FF FF FF FF FF FF FF FFHDV firmware:Compiled Wed 04-Oct-00 19:39 by maniHDV memory size 524280 heap free 211849
Related Commands
Command DescriptionModify the operating mode of the digital subscriber line for an ATM interface.
Show all of the ADSL-specific information for a specified ATM interface.
show dsl interface atm
To show the ADSL-specific information for a specified ATM interface, use the show dsl interface atm command in EXEC mode.
show dsl interface atm slot/port
Syntax Description
Defaults
None
Command Modes
EXEC
Command History
Usage Guidelines
The output from this command appears the same as the output from the command show controller atm 0 | b chipset on the Cisco 1400 series routers.
Examples
This command shows all the ADSL specific information for the ATM interface requested.
Router# show dsl interface atm0/1Alcatel 20150 chipset informationATU-R (DS) ATU-C (US)Modem Status: Showtime (DMTDSL_SHOWTIME)DSL Mode: ITU G.992.1 (G.DMT)ITU STD NUM: 0x01 0x1Vendor ID: 'ALCB' 'ALCB'Vendor Specific: 0x0000 0x0000Vendor Country: 0x00 0x0FCapacity Used: 85% 98%Noise Margin: 13.5 dB 7.0 dBOutput Power: 9.5 dBm 12.0 dBmAttenuation: 1.5 dB 3.5 dBDefect Status: None NoneLast Fail Code: NoneSelftest Result: 0x00Subfunction: 0x15Interrupts: 5940 (0 spurious)PHY Access Err: 0Activations: 1SW Version: 3.670FW Version: 0x1A04Interleave Fast Interleave FastSpeed (kbps): 0 8128 0 864Reed-Solomon EC: 0 0 0 0CRC Errors: 0 0 0 7Header Errors: 0 0 0 2Bit Errors: 0 0BER Valid sec: 0 0BER Invalid sec: 0 0DMT Bits Per Bin00: 0 0 0 0 0 0 0 7 6 7 9 A B C C C10: C C C C C C B B B B A 9 A 9 0 020: 0 0 0 0 0 0 2 2 3 4 4 5 6 6 7 730: 7 8 8 8 9 9 9 A A A A A A B B B40: B B B B B B B B B B B A B B B B50: B B B B B B B B B B B B 2 B B B60: B B B B B B B B B B B B B B B B70: B B B B B B B B B B B B B B B B80: B B B B B B B B B B B B B B B B90: B B B B B B B B B B B B B B B BA0: B B B B B B B B B B B B B B B BB0: B B B B B B B B B B B B A B A AC0: A A A A A A A A A A A A A A A AD0: A A A A A A A A A A A 9 9 9 9 9E0: 9 9 9 9 9 9 9 9 9 9 9 9 8 8 8 8F0: 8 8 8 8 8 8 7 7 7 7 6 6 5 5 4 4
Related Commands
Command DescriptionSpecifies detailed diagnostic options for displaying the memory on an ADSL-WIC and the ADSL line training log.
Glossary
ABR—available bit rate.
ADSL—asymmetric digital subscriber line (ADSL) available through several telecommunications carriers to accommodate the need for increased bandwidth for Internet access and telecommuting applications.
ATM—Asynchronous Transfer Mode. International standard for cell relay in which multiple service types (such as voice, video, or data) are conveyed in fixed-length (53-byte) cells. Fixed-length cells allow cell processing to occur in hardware, thereby reducing transit delays. ATM is designed to take advantage of high-speed transmission media such as E3, SONET, and T3.
CLI—command line interface.
CO—central office, or local exchange (local switch), which terminates individual local telephone subscriber lines for switching, and connects to the public network. Known as a class 5 switch office. For example, 5ESS by Lucent and DMS 100 by Nortel.
CPE—customer premise equipment, including devices such as channel service units (CSUs)/data service units (DSUs), modems, and ISDN terminal adapters, required to provide an electromagnetic termination for wide-area network circuits before connecting to the router or access server. This equipment was historically provided by the telephone company, but is now typically provided by the customer in North American markets.
DSL—digital subscriber line available through several telecommunications carriers to accommodate the need for increased bandwidth for Internet access and telecommuting applications.
FXO—foreign exchange office. A FXO interface connects to a central office.
FXS—foreign exchange station: A FXS interface connects directly to a standard telephone, supplying ring voltage, dial tone, etc.
G.SHDSL—multirate symmetrical high-speed digital subscriber line.
PVC—permanent virtual circuit.



