Multiplex communications – Wide area network – Packet switching
Patent
1983-10-03
1986-04-08
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 85, H04A 1104, H04M 300
Patent
active
045817332
ABSTRACT:
In a small business-type telephone exchange, calls are set up in TDM manner using PCM to convey speech and data if the exchange serves any data terminals. The exchange has subscriber line ports (SLC) each serving two lines and a smaller number of trunk line ports (TLC) each serving a trunk to a local exchange. Each port has a local processor (SIP) with analogue-digital and digital to analogue conversion circuitry (CODEC-FILTER-TSAC). The exchange also has a central processor (CCP) with its associated memories (ROM, RAM, EAROM).
The ports and the central processor are interconnected by an intelligence bus (PCM BUS) and a signalling bus (SIG BUS). The central processor (CCP) and the port processors (SIP) co-operate in call setting with all communications between the processors over the signalling bus. During operation the central processor (CCP) polls the ports via the signalling bus (SIG BUS) for ports needing the services of the central processor and also to pass call control information to those ports.
To set up a call between the lines, or a line and a trunk, two time slots in the TDM cycle are allocated to the call by the central processor, one for each direction of transmission. The intelligence bus (PCM bus) is thus used only to convey intelligence, i.e. speech and/or data and tones.
REFERENCES:
patent: 3941936 (1976-03-01), Graham et al.
patent: 4061880 (1977-12-01), Collins et al.
patent: 4140877 (1979-02-01), Joslon et al.
patent: 4187399 (1980-02-01), Maxfield et al.
patent: 4242749 (1980-12-01), Takezoe
patent: 4287590 (1981-09-01), Bouke et al.
patent: 4370743 (1983-01-01), Moran
patent: 4383137 (1983-05-01), Aikawa et al.
patent: 4385379 (1983-05-01), Kelly et al.
patent: 4455646 (1984-06-01), Bloodworth
patent: 4488004 (1984-12-01), Bogart et al.
Advances for Today, Bell Labs, vol. 60, No. 9, Nov. 1982.
Data Communications in MD 110, Bainicoat, Boman, and Vlancer.
Berndt et al., "Siemens Switching Processor 103D," 6/82, All.
Bungard John R.
Davidson David M.
Sarson Gary A.
Kuntz Curtis
Olms Douglas W.
Standard Telephones and Cables plc
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