Asynchronous digital time-division multiplexing system with dist

Details Asynchronous digital time-division multiplexing system with dist Asynchronous digital time-division multiplexing system with dist

1987-07-07

1989-07-18

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

H04J 302

Patent

active

048499650

ABSTRACT:
The system comprises a first unidirectional packet bus having a bit rate D, each packet including an e-bit identifier and a b-bit package, sources having differing bit rates d.sub.i such that d.sub.m .ltoreq.d.sub.i .ltoreq.d.sub.M <D, and access means for introducing packets from the sources into the first bus. An allocator located at the receiving end of the first bus builds up frames of identifiers identifying active sources. Each frame has a length T=b/d.sub.m and is shared into N=d.sub.M /d.sub.m time slots. Each time slot has a period .theta.=b/d.sub.M and includes a source identifier. The identifier for a same active source having a bit rate d.sub.i is repeated in the frame n.sub.i times such that n.sub.i =d.sub.i /d.sub.m when d.sub.i /d.sub.m is an integer, or such that n.sub.i =1+ integer part of (d.sub.i /d.sub.m) otherwise. The identifier frames are transmitted from the allocator into a second unidirectional bus distributed to all the access means. The access means of each source transmits a packet in the first bus whenever a b-bit package delivered from the source is received and an identifier of the source is detected in the second bus after package reception.

REFERENCES:
patent: 3755782 (1973-08-01), Haas et al.
patent: 4000378 (1976-12-01), Caplan
patent: 4016369 (1977-04-01), Pedersen
patent: 4426697 (1984-01-01), Petersen et al.

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