ISDN private local switching system

Details ISDN private local switching system ISDN private local switching system

1993-05-14

1995-03-14

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 60, 3701101, H04L 1256

Patent

active

053982460

ABSTRACT:
In a private branch exchange connected to an Integrated Services Digital Network, an ISDN user interface unit separates a signal from each user terminal into a B-channel packet and a D-channel packet and further separates the latter into a signaling message and a D-channel packet mode signal. The separated D-channel packet mode signal is multiplexed with D-channel packet mode signals from other user terminals into a D-channel packet mode multiplex signal and applied through a channel to an ISDN network interface unit, while the signaling message is applied to a controller for processing. In the ISDN network interface unit, the D-channel packet mode multiplex signal is multiplexed with the signaling message processed by the controller into an outgoing D-channel signal and transmitted with the B-channel packet to the ISDN.

REFERENCES:
patent: 5278665 (1994-01-01), Sawada et al.

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