Communications: electrical – Digital comparator systems
Patent
1976-12-06
1978-07-11
Yusko, Donald J.
Communications: electrical
Digital comparator systems
178 3, 179 15BA, H04Q 500, H04J 304
Patent
active
041005333
ABSTRACT:
A multipoint polling system wherein a multipoint switch selectively connects a plurality of remote terminals to a central station in response to remote terminal addresses transmitted on a signaling path to the multipoint switch. Polling apparatus stores portions of a remote terminal address list provided by the central station and transmits individual ones of the stored remote terminal addresses on to the signaling path. The polling apparatus periodically requests different portions of the remote terminal address list and replaces the stored remote terminal address portion with the requested remote terminal address portion.
The multipoint switch is advantageously comprised of a plurality of sections with each section of the switch responsive to a portion of the address list for establishing a signaling path between the central station and selected ones of the remote terminals defined by the address list portions. The failure of a multipoint switch section to respond to remote terminal addresses results in the address list portion normally transmitted to the failed section and the address list portion normally transmitted to a remaining active section being transmitted to the active section whereby the active section polls the remote terminals previously polled by both the failed and active sections.
REFERENCES:
patent: 3702008 (1972-10-01), Groth
patent: 3755781 (1973-08-01), Haas et al.
patent: 3787820 (1974-01-01), Sherman
patent: 3866175 (1975-02-01), Seifert, Jr. et al.
patent: 3886318 (1975-05-01), Charransol et al.
patent: 3921138 (1975-11-01), Burns et al.
Napolitano Orlando
Reid Robert Edward
Saltzberg Burton R.
Stochel Nathan Harold
Tingley John Ronald
Bell Telephone Laboratories Incorporated
Lipton Roy C.
Yusko Donald J.
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