Switching station for PCM telecommunication system

Details Switching station for PCM telecommunication system Switching station for PCM telecommunication system

1975-09-04

1977-02-22

Stewart, David L.

H04Q 1104

Patent

active

040093492

ABSTRACT:
A switching station for a telecommunication system, operating with pulse-code modulation, serves a multiplicity of incoming and outgoing PCM channels each consisting of a succession of 8-bit words cyclically interleaved with the words of 31 other channels in an assigned time slot of a 32-channel frame, 32 such frames being received and transmitted over as many signal paths forming a frame group. There are n incoming frame groups and n outgoing frame groups with synchronized bit phases in all the spatially separated channels thereof. A central processor controls the concurrent storage of all the incoming bits of a given phase in n pairs of 16-section input memories, each memory section consisting of 8 stages for the bits of a respective word from an incoming channel on a receiving signal path. During each time slot all the bits of each stored word are read out in parallel from the corresponding input-memory section into a similar section of an output memory from which they can be serially fed to a transmitting signal path during a period allocated to a selected outgoing channel. Thus, any incoming channel can communicate with any outgoing channel in the course of each frame.

REFERENCES:
patent: 3263030 (1966-07-01), Stiefel
patent: 3458659 (1969-07-01), Sternung
patent: 3637941 (1972-01-01), Rekiere
patent: 3790713 (1974-02-01), Neufang

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