Communication system with ISDN as a backup of inter-PBX tie trun

Details Communication system with ISDN as a backup of inter-PBX tie trun Communication system with ISDN as a backup of inter-PBX tie trun

1994-06-21

1995-08-15

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

379 9, 370 582, 370 681, 370 84, 370118, H04L 122

Patent

active

054426227

ABSTRACT:
In a private branch exchange, PBX line interfaces, a tie trunk interface interfacing a distant PBX, an ISDN interface interfacing a public switched ISDN network, and speech codecs are connected to a switch. Each speech codec provides data-rate conversion between a 64-kbps signal and a lower bit-rate signal. A mux/demux unit is connected between the codecs and the switch for multiplexing the lower bit rate signals from the codecs into a multiplex signal and demultiplexing a multiplex signal into lower bit rate signals for coupling to the codecs, respectively. The switch is controlled in response to a call from a PBX telephone to establish a connection between a line interface and any of the codecs and a connection between the mux/demux unit and the tie trunk interface when the distant PBX is the destination. If the call is destined to an ISDN user, a connection is established between the line interface and the ISDN interface. Should the tie trunk fail, a backup connection is established between the mux/demux unit and the ISDN interface and the ISDN network is signalled to establish a connection between the ISDN interface and the distant PBX.

REFERENCES:
patent: 4586174 (1986-04-01), Wong
patent: 4953195 (1990-08-01), Ikemori
patent: 5210740 (1993-05-01), Anzai et al.

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