Cisco Cisco IOS Software Release 12.4(23) Notas de publicación

This section contains the following sections with information that is specific to the Cisco 1800 series 
routers (modular):

Cisco IOS Release 12.3(8)T4 introduces and supports the Cisco 1800 series routers (modular). The 
Cisco 1800 series routers are modular routers with LAN and WAN connections that can be configured 
by means of interchangeable interface cards and advanced integration modules (AIMs). The Cisco 1800 
series routers (modular) include the Cisco 1841 in Cisco IOS Release 12.4(1).

The Cisco 1841 router is a data-only router with two HWIC/WIC/VWIC slots, capable of supporting 
single-wide High-Speed WAN Interface Cards (HWICs) and one AIM slot. It can be placed on a desktop 
or wall-mounted. The Cisco 1841 does not provide inline power support.

Although you can use voice/WAN interface cards (VWICs) in the Cisco 1841 router, they will function 
only in data modes. Voice interfaces are not supported.

For memory recommendations for the Cisco 1800 series routers (modular) in Cisco IOS Release 12.4, 
see the 

Cisco IOS Release 12.4 supports the Cisco 1841 integrated services router.

The Cisco 1841 router supports any combination of one or two of the following WAN interface cards 
(WICs) or Multiflex Voice/WAN interface cards (VWICs) (data only), which are shared with the 
Cisco 1700, Cisco 2600, and Cisco 3600 series routers: 

WIC-1T: One-port high-speed serial (synchronous/asynchronous).

WIC-2T: Two-port high-speed serial (synchronous/asynchronous).

WIC-2A/S: Two-port low-speed serial (synchronous/asynchronous) (up to 128 kbps). 

WIC-1ADSL: One-port ADSL.

WIC-1ADSL-I-DG: One-port ADSLoISDN Wan interface card.

WIC-1ADSL-DG: One-port ADSLoPOTS WIC with Dying Gasp.

WIC-1B-S/T-V3: One-port ISDN WAN interface card (dial and leased line).

WIC-1B-U-V2: One-port ISDN BRI NT-1 WIC for Cisco 1700, 1800, 2600, 3600, and 3700 series.

WIC-1DSU-56K4: One-port integrated 56/64-kbps 4-wire DSU/CSU.

WIC-1DSU-T1-V2: Updated one-port T1/fractional T1 DSU/CSU WAN interface card.

WIC-1SHDSL: One-port G.SHDSL.