发明名称 |
Digital telephone exchange with means for processing packet-switched data |
摘要 |
Digital telephone exchange comprising a plurality of peripheral control domains PCD which are either connected 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 subscriber 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 as firstly signalling information (s) and secondly telemetry and slow data (t+d'). The separately applied signalling 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 the signals S and (t+d') combined into messages are exchanged between the subscribers without loading the central control unit (CCU) of the telephone exchange.
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申请公布号 |
US4486878(A) |
申请公布日期 |
1984.12.04 |
申请号 |
US19820408339 |
申请日期 |
1982.08.16 |
申请人 |
U.S. PHILIPS CORPORATION |
发明人 |
HAVERMANS, GERARDUS M. J. |
分类号 |
H04L12/64;H04M3/00;H04M11/06;H04Q11/04;(IPC1-7):H04J3/02 |
主分类号 |
H04L12/64 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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