H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/25
H04Q 11/04 (2006.01)
Patent
CA 1038067
MULTIPLE FAULT TOLERANT DIGITAL SWITCHING SYSTEM FOR AN AUTOMATIC TELEPHONE SYSTEM ABSTRACT A digital switching arrangement having equipment interconnected to provide multiple fault tolerances in the digital switching of PCM (Pulse Code Modulated) data over time division multiplex lines. The digital switching arrange- ment includes a set of peripheral units interconnected via a switching network. The set of peripherals includes input/ output facilities such as digital trunks, analog trunks, and subscriber lines and also includes control processors and related common control equipment. Peripheral units are connect- ed to the switching network over digital links. The digital links carry multiplexed PCM data and serve as the exclusive interface between the outside world and the switching network. The multiplexed content of the digital links is further inter- leaved on superhighways within the switching network in such a manner as to uniformaly distribute traffic as well as increase system reliability. Time-space-time switching is performed between incoming and outgoing superhighways over a modular time-space-time switch.
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