发明名称 |
Telecommunications switching network using digital switching modules |
摘要 |
It has been proposed to base advanced Digital Switching networks on a modular array using Digital Switch Modules (DSM). It has been found, for large traffic handling Digital switching systems, that the cross-office delay encountered in multi-stage networks based on 8x8 Digital Switching Modules (DSM's) is unacceptably large. To maintain the flexibility provided by the multi-stage concepts a demultiplexing/mixing/remultiplexing stage (DMR) is introduced to replace intermediate DSM ranks. The DMR is used to provide a preset time/space switching function within the total trunking providing the availability of a controlled stage but without the control and delay penalties associated with a fully flexible DSM or the control and link blocking disadvantages associated with a pure space switch. The DMR effectively acts as a pre-programmed or counter driven DSM. By adjusting the degree of DMR function it is possible to provide a very wide range of switch sizes which uses a common organization in the controlled switch stages. The operation of the DMR may be defined in conjuction with a mirror imaging correlation function to provide a constant switch loop delay for duplex connections.
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申请公布号 |
US4425640(A) |
申请公布日期 |
1984.01.10 |
申请号 |
US19810255487 |
申请日期 |
1981.04.20 |
申请人 |
THE PLESSEY COMPANY PLC |
发明人 |
PHILIP, ALEXANDER S.;MADDERN, THOMAS S. |
分类号 |
H04Q11/08;(IPC1-7):H04Q11/04 |
主分类号 |
H04Q11/08 |
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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