Digital data communication network having differing data transmi

Details Digital data communication network having differing data transmi Digital data communication network having differing data transmi

1979-04-17

1981-03-24

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

178 3, 179 2DP, 370 84, 370;84, H04L 514

Patent

active

042584337

ABSTRACT:
The invention relates to method of interconnecting terminal devices in a digital telephone network wherein either the terminal devices in question normally operate at different data rates or they are to be interconnected over data links in the network which normally operate at different data rates. The method involves firstly determining, by processor means at a switching point in the network, the normal data bit rate of two terminals to be interconnected as well as the normal data bit rate of the or each data link over which the connection is to be made. In the case where there is a difference in the normal data bit rates the processor initiates a procedure to send a digital bit stream to one or both of the terminals to cause the terminals to operate, in the course of the connection, at a common data rate equal to the lowest of the normal data bit rates of said terminals and said data link. A telephone adapted to operate at different data rates in response to receiving a digital bit stream at the new rate or a digital code word is also described and claimed

REFERENCES:
patent: 3536840 (1970-10-01), Sullivan
patent: 3569943 (1971-03-01), Mackie et al.
patent: 3676858 (1972-07-01), Finch et al.
patent: 3862373 (1975-01-01), Cohen et al.
patent: 3876838 (1975-04-01), Boxall
patent: 3937882 (1976-02-01), Bingham
patent: 4000371 (1976-12-01), Ogawa
patent: 4069392 (1978-01-01), Goldenberg et al.

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