Cisco Cisco IOS Software Release 12.2(8)YJ

The following sections list the new hardware and software features supported by the Cisco 1700 series 
routers for Release 12.2(8)YJ.

The following sections describe the new hardware features supported by the Cisco 1700 series routers 
for Release 12.2(8)YJ.

Release 12.2(8)YJ introduces 1- and 2-port T1/E1 Multiflex Voice/WAN interface cards (VWICs) on 
Cisco 1721 routers to provide basic structured and unstructured service, two data channel groups over a 
single port, and TDM cross-connect link services for T1 or E1 networks on the Cisco 1721 routers. Cisco 
1721 routers support 56Kbps connections for fractional and full T1/E1 services when these VWICs are 
installed.

The following T1/E1 VWICS are available for the Cisco 1721 routers:

VWIC-1MFT-E1

VWIC-2MFT-E1

VWIC-1MFT-T1

VWIC-2MFT-T1

VWIC-1MFT-G703

VWIC-2MFT-G703

VWIC-2MFT-T1-DI

VWIC-2MFT-E1-DI

Prior to Release 12.2(8)YJ, Cisco 1- and 2-port T1/E1 multiflex interface cards were supported on 
the Cisco 1751 and 1760 routers and on the Cisco 2600 and 3600 series routers. 

Cisco 1- and 2-port 
T1/E1 multiflex interface 
cards

No

Yes

No

Yes

No

Yes

Yes