T1/E1

This section describes the following expansion modules and daughterboard available for use with the Passport 4400 unit:

• The T1 Voice Modules (TVM) (4430/50/55)
• The Single Port T1 Voice Module (TVM/1), which provides connection to a single T1 line (DS-1).
• The Dual Port T1 Voice Module (TVM/2), which provides connections to two T1 lines (DSX-1 and DS-1).
• The T1/PRI Digital Voice Module (4460)
• The E1 Voice Modules (EVM) (4430/50/55)
• The Single Port E1 Voice Module (EVM/1), which provides connection to a single E1 line (L1).
• The Dual Port E1 Voice Module (EVM/2), which provides connections to two E1 lines (L1 and L2).
• The E1/PRI Digital Voice Module (4460)
• The Digital Voice Modules (DVMs) (4430/50/55), a daughterboard which allows the T1 or E1 Voice Module to support digital voice channels (each DVM supports one voice channel).
• The Digital Voice Expansion Module (DVEM) (4430/50/55), which contains slots to house additional Digital Voice Modules.
• The Digital Voice Expansion Module (VEM) (4460)

Together, these modules provide Passport 4430/50/55 units with T1 or E1 Digital Module Interconnectivity and T1/E1 Voice Module Interconnectivity (4430/50/55).

Also contained in this section are the following subsections:

• T1/E1 System Configuration
• Diagnostics
• Transparent CCS

This section highlights the characteristics of each module, and diagrams the signal flow between these modules, the Passport 4430/50/55 Ethernet Base Module (EBM), and any external interfaces.

Unless specified otherwise, all subsequent discussions apply to both single-port and dual-port T1 and E1 Voice Modules.

Note: For physical details on the modules covered here, please refer to the Hardware Installation Manual, 800-1951.