Cisco Cisco IOS Software Release 12.0(14)S

This feature module describes the availability of clear channel (T3 subrate) on the Two-Port Enhanced 
Multichannel T3+ Port Adapter (PA-MC-2T3+). It includes information on the benefits of this new 
feature, supported platforms, configuration examples, and a command reference.

This document contains the following sections:

The PA-MC-2T3+ is a single-width port adapter that provides two T3 interface connections. Each T3 
interface can now be independently configured to be either channelized or unchannelized. A 
channelized T3 provides 28 T1 lines multiplexed into the T3. Each T1 line can be configured into one 
or more serial interface data channels.

Using the no channelized command, you can configure the T3 as a single, unchannelized serial 
interface data channel. You can configure this data channel to use all of the T3 bandwidth or a portion 
of it.

The PA-MC-2T3+ now provides the following benefits:

Two T3 ports each with integrated CSU/DSUs

Two T3 ports on one single-wide port adapter

Up to 256 logical, T1 Nx56K and Nx64K channels

28 T1 ports multiplexed into a single T3 connection

Channelized T1, fractional T1, and full-rate T1 support