Hardware Technical Reference Manual
Pin Allocations
T1/E1 Combo Card
Description
The T1/E1 Combo MMC combines trunking and DSP functionality on a single card. The T1/E1
Combo card provides for resiliency. To use resiliency, you must have two 3300 ICPs running
Release 7.0 software (or later) and a T1/E1 trunk connected to both ICPs. The trunk can fail
over to the secondary ICP in the event of a primary ICP failure.
The digital trunk port can be configured as a T1 interface (1.544 Mbps) that provides 24
B-channels for T1/D4 and 23 B-channels for ISDN PRI or QSIG. The DSP provides resources
for CLASS tone generation, Record-a-Call conferences, DMTF receivers, voice compression,
and voice echo cancellation.
Table 11: Dual T1/E1 Framer Pin Allocations
Pin Number
Signal
Network Termination (Default) Line Termination
1 Rx Ring Tx Ring
2 Rx Tip Tx Tip
3– –
4 Tx Ring Rx Ring
5 Tx Tip Rx Tip
6 – –
7– –
8 – –
Note: Network and Line Termination settings are software-controlled.
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