The Model 4400IVM-BRI/ST/1 ISDN BRI Voice Module, hereafter referred to as the BRI voice module, is an expansion module installed within Nortel's Passport 4430/50/55 unit. Its main function is to provide the Passport 4430/50/55 unit with an ISDN interface for connection to an ISDN PBX.
For Passport 4460 applications, a Single/Dual port BRI voice module is used to provide the Passport 4460 unit with an ISDN BRI voice interface for connection to an ISDN PBX.
In its present application, the BRI voice module is intended for connection to the trunk side of an ISDN PBX. When so connected, the BRI voice module will serve as one half of an ISDN tie trunk that connects two ISDN PBXs.
Signaling is over the ISDN D-channel, using the ETSI Q-Sig protocol. As such, the Passport 4400 unit recognizes the Q-Sig commands to provide call setup, call tear down and the channeling of the dialed digits to its counterpart at the remote end. Once communication is established, the B-channels are opened to the flow of two-way voice traffic. When call tear down is requested by the PBX, the associated Passport 4400 unit terminates the call.
The following topics are discussed in this section:
  |
|