H - Electricity – 04 – L
Patent
H - Electricity
04
L
344/18
H04L 12/52 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 1337303
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.
604913
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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