H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/25
H04Q 11/04 (2006.01) H04L 12/64 (2006.01) H04M 11/06 (2006.01)
Patent
CA 1189939
ABSTRACT: "Digital telephone exchange comprising means for pro- cessing packet-switched data". Digital telephone exchange comprising a plurality of peripheral control domains PCD which are either con- nected to a digital trunk network DTN or are directly interconnected. Each domain comprises several digital subscriber interface units DSI, a group of digital subscriber sets SS being connected to each interface unit. The transmission of information over the sub- scriber line is effected in a b-channel for speech (64 kb/s) a b'-channel for circuit-switched data (0/8/64 kb/s) and a .DELTA.-channel for packet-switched data (8/16 kb/s). The subscriber line interface circuits SLIC comprise means (166) for identifying the packet-switched data signals and to apply them to a packet processing unit PPU. In this unit the packets are distinguished and firstly signalling information (s) and secondly tele- metry and slow data (t+d'). The separately applied signal- ling information (s) and telemetry data and slow data (t+d') intended for a subscriber line are combined by the packet processing unit to form one packet-switched data signal (.DELTA.) for the subscriber line. In a data unit connected to the trunk network and signals S and (t+d') combined into messages are exchanged between the subscribers without loading the central control unit (CCU) of the telephone exchange.
411778
Fetherstonhaugh & Co.
N.v. Philips Gloeilampenfabrieken
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