Multiplex communications – Wide area network – Packet switching
Patent
1980-07-25
1982-07-20
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 67, H04Q 1104
Patent
active
043409601
ABSTRACT:
A multimodule time division switching system is disclosed having facilities for the serving of conference calls between port circuits in at least three different modules. Each module serving a conference call transmits a series of call data words to the other modules serving the same call over a special bus system interconnecting all modules. Each word contains information including a module ID number and a time slot number as well as the message or intelligence representing the subject matter of the call. The transmitted ID number specifies the identity of the other modules serving the same call and to which the word is directed. The transmitted time slot number specifies the time slot in which the call is to be served by only a first one of the specified receiving modules. This first module responds to the reception of the word and serves the call in the specified time slot. The other specified module responds to the reception of the word, derives a new time slot number from the transmitted slot number and serves the call in this derived time slot.
REFERENCES:
patent: 3735359 (1973-05-01), Wagner
patent: 3769461 (1973-10-01), Lewis
patent: 3996566 (1976-12-01), Moran
patent: 3997730 (1976-12-01), Stidham
patent: 4049920 (1977-09-01), Knollman
patent: 4061880 (1977-12-01), Collins et al.
patent: 4069399 (1978-01-01), Barrett et al.
patent: 4126766 (1978-11-01), McLaughlin et al.
"Development of Electronic Tandem Service (ETS) Features for the Dimension PBX", by Gerrish et al., IEEE COMPSAC, Nov. 1979, pp. 86-93.
Bell Telephone Laboratories Incorporated
Duft D. M.
Olms Douglas W.
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