Cisco WAN Interface Cards

Use WIC-1DSU-T1 Interface Cards on Cisco 1600, 1700, 2600, 3600 and 3700 Series Routers

Document ID: 10207

Updated: Oct 05, 2006



This document provides an overview of the WIC-1DSU-T1 and WIC-1DSU-T1-V2 interface cards and provides a sample configuration to use these interface cards on Cisco 1600, 1700, 2600,3600 and 3700 router platforms. The WIC-1DSU-T1-V2 is an updated version of the WIC-1DSU-T1 interface card (which has reached End-of-Life [EoL]/End-of-Sale [EoS]), that offers additional supported features with the same performance.



There are no specific requirements for this document.

Components Used

This document is not restricted to specific software and hardware versions.


Refer to Cisco Technical Tips Conventions for more information on document conventions.


The T1 Data Service Unit/Channel Service Unit (CSU/DSU) WAN interface card provides full or fractional T1 service. The T1 CSU/DSU WIC does not provide channelized T1 or ISDN PRI. Refer to the Product data sheet for more information. Facilities Data Link (FDL) is off by default, and you must configure FDL to either American National Standards Institute (ANSI) or AT&T 54016, but not both at the same time.

The Cisco T1 DSU/CSU -V2 WIC is supported on the Cisco 1700 Series, 2600XM Series, 3631, and 3700 Series routers, and Cisco ICS 7750 software.

  • T1 or fractional T1 network interface

  • Wet T1 support (not available on WIC-1DSU-T1)

  • N x 64 kbps or N x 56 kbps nonchannelized data rates (N = 1 to 24)

  • Standards-based, including ANSI T1.403 and AT&T Publication 62411

  • Full management features:

    • Configuration—Capability for remote configuration using Telnet from the Cisco IOS command line interface (CLI).

    • Monitoring—Router and DSU/CSU are manageable as a single Simple Network Management Protocol (SNMP) entity. Extensive DSU/CSU statistics are provided by the Cisco IOS CLI.

    • Troubleshooting—Extensive loopbacks (including manual button for network line loopback), bit error rate tester (BERT) test patterns, alarm counters, and performance reports, all of which are accessible from Cisco IOS CLI. LEDs for carrier detect, loopback, and alarm functions.

Supported Platforms

The WIC-1DSU-T1 is supported in these Cisco IOS® software releases:

Platform Cisco IOS Software Release
1600 11.2(12)P, 11.3(3)T, All 12.x
1700 All Cisco IOS versions
2600* 11.3(4)T1, 12.0(1), 12.0(1)T, 12.1(1), 12.1(1)T, 12.2(1), 12.2(2)T
2600XM 12.1(14), 12.2(12), 12.2(8)T1, 12.2(11)YT
3620, 3640 11.2(12)P, 11.3(3)T, All 12.x
3631 Not Supported
3660 All Cisco IOS versions
2691, 3725, 3745 12.2(13)T, 12.2(11)YT

Note: The service-module fdl command is available on Cisco 2600 routers in Cisco IOS software releases 12.0(3), 12.0(3)S, 11.3(8)T and 12.0(3)T.

The WIC-1DSU-T1-V2 is supported in these Cisco IOS software releases:

Cisco IOS Software Release
12.2(15)ZL PCBU special [Cisco 1700 Series only]
12.2(17) Mainline
12.3(1) Mainline

The Cisco T1 DSU/CSU WIC offers all of the features of the WIC-1DSU-T1 and can be smoothly deployed without any additional training.

Description Updated one-port T1/fractional T1 DSU/CSU WIC One-port T1/fractional T1 DSU/CSU WIC
Router families supported 1700(1) (1720, 1721, 1751, 1760), 2600XMs, 2691, 3631, 3725, 3745, ICS 7750, 1800 and 2800 1600(2) , 1600R(2), 1700(3) , 2600, 2600XM, 3600, and 3700
Wet T1 Capable Yes No
Short Cable Length Command Yes; used to configure attenuation for short cable lengths (<660 feet) No
Network Equipment Building Standards (NEBS) Yes: Type I/III No

Note: Cisco 1701, 1710, 1711, and 1712 are fixed-configuration routers and do not support the WIC-1DSU-T1 or WIC-1DSU-T1-V2. Also, the Cisco 1750 does not support this WIC.

Note: Cisco 1600 and 1600R routers are no longer sold by Cisco Systems.

Sample Configuration

Here is a sample configuration for a WIC-1DSU-T1 interface card. There are no controller or controller-related commands, such as channel-group, to configure. With this WIC card, service-module commands are used. The syntax with regard to the framing, line-code, and so on remains the same. In this scenario a full T1 card with 24 timeslots is used.

Interface serial 0/0
service-module t1 clock source internal
service-module t1 timeslots 1-24 speed 64
service-module t1 framing esf
service-module t1 linecode b8zs
ip address
encapsulation pppfair-que
no shut

Related Information

Updated: Oct 05, 2006
Document ID: 10207