Telecommunications switching network using digital switching mod

Details Telecommunications switching network using digital switching mod Telecommunications switching network using digital switching mod

1981-04-20

1984-01-10

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 64, H04Q 1104

Patent

active

044256400

ABSTRACT:
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 8.times.8 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.

REFERENCES:
patent: 4123624 (1978-10-01), Gagnier et al.
patent: 4201891 (1980-05-01), Lawrence et al.
patent: 4344170 (1982-08-01), Arita
"Limitation of Transmission Rate in High-Speed TDM-Switching Networks Using Schottky-TTL Circuit Technology", by Pfannschmidt, Lehrstuhl, Fur Nachrichtensysteme, Technische Universitat Braunschweig, Brunswick, Germany, pp. C3.1-C3.6.

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