Pseudo synchronous transport mechanism in a communication networ

Multiplex communications – Wide area network – Packet switching

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H04J 326

Patent

active

047992190

ABSTRACT:
A pseudo synchronous mechanism is used in the nodes of a communication network for exchanging non-character coded information (NCI) and potentially character coded information on inter node links. Communication is performed in frames comprising circuit slots devoted to the transportation of character coded information. The circuit slots are assigned to circuit users on a per-call basis under control of node management apparatus. The slots are qualified by at least one qualification bit (Caq) which indicates, when set to a first value (0) that the users are momentarily active and when set to a second value (1) that the users are momentarily inactive. The node mechanism includes a store in which queues of storing positions are assigned to the circuit users attached to the node. The circuit user information to be sent on the network internode links or received from the internode links is stored in the store. The node mechanism further includes an internode adapter which controls the generation and reception of the frames to and from each internode link. The adapter operates under control of a node manager which assigns on a per-call basis, a set of at least one slot in the frames transported on the network link to each of a plurality of circuit users. The node also includes transmit and receive controls which cause the queues assigned to the plurality of local users to be sequentially scanned and read from or written to according to whether the qualification bits are set to a first value.

REFERENCES:
patent: 4603416 (1986-07-01), Servel et al.
patent: 4623996 (1986-11-01), McMillen
patent: 4718062 (1988-01-01), Andersen
A Hybrid Switched Open Network for Voice and Data Services, by C. Fruchard et al., Proceedings of the International Switching Symposium, 7-11, May 1984, Florence, Italy, pp. 2.1,2.7,3.1.2.

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