Cisco Cisco IOS Software Release 12.0(14)S

Subrate and full rate T3 support

Line and payload loopback capabilities

Full bit error rate testing on any T1 or any unchannelized T3

DSX-3 level interface

Full duplex and connectivity at DS3 rate (44.736 Mbps)

T3 Scrambling and subrate can be independently or simultaneously enabled in each DSU mode

C-bit or M13 framing 

B3ZS line coding

DS3 FEAC channel support

Support for Frame Relay, PPP, HDLC, SMDS DXI, and X.25

The PA-MC-T3+ does not support the following:

More than 128 channels per T3

Use of unused channels of one T3 by the other T3

PA-MC-T3

PA-2T3+

PA-MC-2T3+ Phase I

Cisco 7200 series

Cisco 7500 series

ANSI T1.107

ANSI T1.102

ANSI T1.403