Cisco WAN Interface Cards

Understanding the 1-Port ISDN BRI S/T Leased Line WIC (WIC-1B-S/T-LL)

Cisco - Understanding the 1-Port ISDN BRI S/T Leased Line WIC (WIC-1B-S/T-LL)


The 1-port ISDN BRI S/T leased line WAN interface card (WIC) (WIC-1B-S/T-LL) is designed specifically for the Cisco 1603 R and 1604 R routers. It is intended for users who require a dialup ISDN BRI line (from the Cisco 1603 R or 1604 R router's built-in ISDN port) and an ISDN leased line (from this ISDN BRI leased line WIC inserted into the Cisco 1603 R or 1604 R router).

The graphic below shows the WIC-1B-S/T-LL.




There are no specific prerequisites for this document.

Components Used

Please refer to the Platform Support section for detailed information.

The information presented in this document was created from devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If you are working in a live network, ensure that you understand the potential impact of any command before using it.


For more information on document conventions, see the Cisco Technical Tips Conventions.

Product Number

WIC-1B-S/T-LL - One Port ISDN BRI S/T Leased Line WAN Interface Card


The following lists the features related to the WIC-1B-S/T-LL.

  • 64-kbps of ISDN leased line support on the WIC-1B-S/T-LL card is only available on the B1 channel.

  • Supported on the Cisco 1603 R and 1604 R routers.

  • Does not support ISDN dialup.

  • Single B-channel WIC (B1 channel always assigned).

  • The no isdn leased line bri <interface-number>command will default the box to the 64 k leased line mode.

  • Does not support hot swap, however no hardware damage will occur if it is swapped while the power is on.

Platform Support

The following table details the platform support for the WIC-1B-S/T-LL.

Platform Cisco 1600 (*) Cisco 1700 Cisco 2600,2600XM Cisco 3620,3640 Cisco 3631 Cisco 3660 Cisco 2691,3725,3745
Cisco IOS® Software Support Cisco IOS Versions 11.2(9)P, 11.3(3)T, and all 12.x Not supported Not supported Not supported Not supported Not supported Not supported

Note: This WIC is only supported in the Cisco 1603, 1603-R, 1604, or 1604-R. The WIC-1B-S/T-LL card supports the 128k leased line starting in Cisco IOS Version 11.3(3)T.

Note: The Cisco IOS software releases provided are typically the minimum version required to support the platform, module, or feature in question. Use the Software Advisor (registered customers only) to choose appropriate software for your network device: match software features to Cisco IOS and CatOS releases, compare IOS releases, or find out which software releases support your hardware.


Note: The WIC-1B-S/T-LL card is automatically configured in ISDN leased line mode and never operates in dialer mode.

For information on configuring an ISDN leased line, refer to the following documents:

Related Information