Multiplex communications – Wide area network – Packet switching
Patent
1988-09-30
1990-11-13
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 859, H04J 312
Patent
active
049707230
ABSTRACT:
A single international standard integrated services digital network (ISDN), basic rate interface (BRI) is arranged so that either a data terminal and two voice terminals, three voice terminals, or four voice terminals can be operated simultaneously through the interface. Code converters, associated with the voice terminals and with a central office switch, convert eight-bit voice sample code from either the voice terminals or the central office switch to four-bit voice sample code in the interface to enable the bit streams of two voice terminals to be merged for transmission through a single B-channel at the interface. When two voice terminals are operated simultaneously through one B-channel, each of those terminals positions four-bit coded voice samples in a different sub B-channel of the B-channel and stuffs four bits in the other sub B-channel. Four-bit coded voice samples from the sub B-channels are converted to voice samples in the voice terminals and to eight-bit codes voice samples in the central office switch.
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AT&T Bell Laboratories
Edwards Christopher O.
Havill Richard B.
Olms Douglas W.
Stafford Thomas
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