Multiplex communications – Wide area network – Packet switching
Patent
1985-05-21
1988-02-16
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 96, 34082508, H04J 302, H04J 316, G05B 2302
Patent
active
047260173
ABSTRACT:
A multidrop network for effecting communications between a master site and a plurality of remote slave sites employs a multiport multiplexer at the master site and at slave sites, for interfacing multiple ports to a single telephone communication link. At the master site multiple/diverse types of data/signal processing equipments are coupled to respective ports of a master communications multiplexer or concentrator. Under internal processor control the master concentrator interfaces one of its input ports to an associated communications modem by way of which messages are exchanged over the telephone link. That input port of the master concentrator which is interfaced to its associated modem establishes a corresponding destination port of each remote concentrator that is coupled to a respective drop distributed along the telephone link. Interleaved between successive message (data) packets that are transmitted from the master site to addressed devices at remote sites are polling frames assembled by the master site concentrator which sequentially and periodically interrogate the respective ports of all remote concentrators for reply messages to be transmitted to master site terminal equipments which had previously sent requests for data.
REFERENCES:
patent: 3924077 (1975-12-01), Blakeslee
patent: 4398287 (1983-08-01), Spencer
patent: 4427898 (1984-10-01), Cholat-Namy
patent: 4472712 (1984-09-01), Ault et al.
patent: 4481626 (1984-11-01), Boggs et al.
Clairmont Jan M.
Cunningham Howard L.
Gotsa Felix L.
Krum Harry A.
McKenna Dennis
Fla.
Olms Douglas W.
Scutch III Frank M.
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