Cisco Cisco IOS Software Release 12.3(14)T

© 2012 Cisco Systems, Inc. All rights reserved.

The second-generation 1- and 2-port T1/E1 multiflex trunk (MFT) voice/WAN interface cards (multiflex 
VWICs) support data and voice applications in Cisco multiservice routers. The multiflex VWIC 
combines WAN interface card (WIC) and voice interface card (VIC) functionality to provide the 
following improvements:

Support for both T1 and E1—T1/E1 MFT VWIC2 cards provide additional flexibility in configuring 
the MFT VWIC2 cards by supporting T1, fractional T1, E1, and fractional E1 for both voice and 
WAN applications. 

Drop and insert capability on all versions—All MFT VWIC2 modules now include the drop and 
insert multiplexing capability, which eliminates external third party CSU/DSUs and drop and insert 
multiplexers. 

Enhanced clocking capabilities—The 2-port MFT VWIC2s can enable each port to be clocked from 
independent clock sources for data applications. This independent clocking capability is not 
supported for voice applications and not supported with the AIM-ATM-VOICE-30 module.

Dedicated echo cancellation option—MFT VWIC2s have an onboard slot for a multiflex trunk 
dedicated echo cancellation module (EC-MFT-32 and EC-MFT-64), offering an enhanced echo 
cancellation capability for demanding network conditions. For more information about this feature, 
refer to the “Hardware Echo Cancellation” chapter in the 

.

Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image 
support. Access Cisco Feature Navigator at 

. You must have an account on 

Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at 
the login dialog box and follow the instructions that appear. 

12.3(14)T

This feature was introduced on the following platforms: Cisco 2600XM 
series, Cisco 2691, Cisco 2800 series, Cisco 3662 (telco models), 
Cisco 3700 series, and Cisco 3800 series.