Cisco Cisco IOS Software Release 12.3(14)T

The drop and insert feature enables the removal of DS0 time slots from one E1 interface and insertion 
into time slots of the other E1 interface. This feature is available in VWIC applications. If you configure 
drop and insert, be sure that the E1 framing under the controllers involved (the tdm-groups configuration 
location) is the same. If you use different frame types, the signaling bits may not be read properly. This 
failure occurs during the drop of a channel from one controller and insertion into a channel from another 
controller. Drop and insert time slots do not need to be contiguous.

 summarizes the network modules supported by the second-generation 1- and 2-port T1/E1 

multiflex trunk voice/WAN interface cards.

To configure the second-generation 1- and 2-port T1/E1 multiflex trunk voice/WAN interface cards 
feature, perform the task described in the following section:

1.

For this feature to work properly, the network modules listed here must be installed in one of the following platforms: 
Cisco 2600XM series, Cisco 2691, Cisco 2800 series, Cisco 3662 (telco models), Cisco 3700 series, and Cisco 3800 series

NM-HDV

Choose zero or one

VWIC2-1MFT-T1/E1
VWIC2-2MFT-T1/E1
VWIC2-2MFT-G703

NM-HDV2

Choose zero or one

VWIC2-1MFT-T1/E1
VWIC2-2MFT-T1/E1
VWIC2-1MFT-G703
VWIC2-2MFT-G703

NM-HD-2VE

Choose zero, one, or two

VWIC2-1MFT-T1/E1
VWIC2-2MFT-T1/E1

NM-2W 
NM-1FE1R2W 
NM-1FE2W-V2 
NM-2FE2W-V2

Choose zero, one, or two

VWIC2-1MFT-T1/E1
VWIC2-2MFT-T1/E1
VWIC2-1MFT-G703
VWIC2-2MFT-G703