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T1, E1, and Digital Voice ModulesPassport 4400 Hardware Installation Manual
5-2
T1 Voice Module
The T1 Voice Module is available in a single (TVM/1E - NTAY99AA) or dual
(TVM/2 - NTAY14AA) model. These modules provide an interface to one or two
1.544 Mbytes T1 lines (DS-1 for connection to T1 network services and DSX-1
to a local PBX).
The T1 Voice Module also provides additional T1 connectivity for two high-speed
data ports, DP1 and DP2, and to the primary and secondary ports of the Ethernet
Base Module of the Passport 4400 unit.
The T1 Voice Module can support a maximum of 24 Digital Voice Modules (6 on
the T1 Voice Module; 18 on Digital Voice Expansion Modules).
Figure 5-1. T1 Voice Module
DP1
DP2
Front
LED Block
Module
Switch Group
Receptacles (6) for
Digital Voice Modules
Rear
(Back Panel)
Stacking Connectors