Modular structure for multistage PCM switching network

Details Modular structure for multistage PCM switching network Modular structure for multistage PCM switching network

1982-01-13

1984-09-25

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

H04J 300

Patent

active

044739001

ABSTRACT:
A five-stage PCM switching network of an automatic telephone exchange is divided into a set of outer modular units each including a first-stage and a fifth-stage matrix, a set of inner modular units each including a second-stage and a fourth-stage matrix, and a set of central modular units each including a pair of third-stage matrices. Each modular unit is provided with an individual base-level microprocessor controlling the switching of its matrices and the checking of their performance with the aid of ancillary equipment including transceivers sending back outgoing signals and samplers delivering bytes from corresponding time slots at opposite ends of an established signal path to a comparator in the associated microprocessor. Each set is divided into several subsets provided with respective intermediate-level microprocessors which control their base-level microprocessors; a top-level microprocessor, responsive to commands from a central controller, dialogues with the intermediate-level microprocessors for setting up and discontinuing calling connections between incoming PCM lines joined to inputs of the first-stage matrices and outgoing PCM lines joined to outputs of the fifth-stage matrices.

REFERENCES:
patent: 3674938 (1972-07-01), Jacob
patent: 3754100 (1973-08-01), Jacob
patent: 4213201 (1980-07-01), Gagnier et al.
patent: 4228536 (1980-10-01), Gueldenpfennig et al.
F. Viard et al., "A New Range of CIT-ALCATEL Time-Switching Telephone Exchanges", Commutat. & Transm. (France), vol. 1, No. 1, Sep. 1979, pp. 87-102.

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