Multiplex communications – Wide area network – Packet switching
Patent
1986-12-03
1989-06-27
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
370 55, H04J 316
Patent
active
048436062
ABSTRACT:
In a local area communication system comprising token rings (11) with synchronous bandwidth managers SBM (15) for issuing priority tokens for quasi-synchronous frames at regular intervals, the rings are interconnected by a time division muliplex PBX unit (21) via their SMB units. Buffers are provided in each SBM for synchronous information blocks transferred from and to the ring, and the TDM control (31) can independently access these buffers for TDM switching of the individual bytes of said information blocks. Besides this PBX interconnection for synchronous information or voice, the rings are also interconnected by a backbone bus or ring for transfer of asynchronous data between rings. A special slot rearrangement procedure is provided to improve the filling of time slots in the quasi-synchronous frames that are no longer used after release of a connection, to allow for adapting the frame length (number of issued slots) to the number of existing connections.
REFERENCES:
patent: 4539679 (1985-08-01), Bux et al.
patent: 4592044 (1986-05-01), Ferene et al.
patent: 4674086 (1987-06-01), Szczepanek et al.
patent: 4680757 (1987-07-01), Murakami et al.
Bux Werner K.
Closs Felix H.
Mueller Johann R.
Van As Harmen R.
Zafiropulo Pitro A.
Cockburn Joscelyn G.
Frisone John B.
Griffin Robert L.
International Business Machines Corp.
Scutch III Frank M.
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