Method of routing calls for a network of digital time-switched e

Details Method of routing calls for a network of digital time-switched e Method of routing calls for a network of digital time-switched e

1988-01-25

1989-05-16

Schreyer, Stafford D.

Telephonic communications

With usage measurement

379115, 379220, 379137, H04M 336

Patent

active

048316490

ABSTRACT:
A method of routing calls for a network of digital time-switched exchanges (A, B, C, D, E, F, D) interconnected by groups (18 to 28) of PCM time multiplex trunks, with each group ingterconnecting two exchanges. Each exchange establishes a utilization cost for each of the groups connected thereto. This cost is based on the busy fraction of the least busy trunk in the group of trunks under consideration and it is transmitted to all of the exchanges in the network in order to enable them to determine least cost paths for the calls that they are requested to set up.

REFERENCES:
patent: 3394231 (1968-07-01), Hopper et al.
patent: 4532625 (1985-07-01), Stover
patent: 4723270 (1988-02-01), Okamoto et al.
International Teletraffic Congress, vol. 5, Sep. 1985, pp. 795-801, Elsevier Science Publishers, Amsterdam, NL; G. R. Ash: "Use of trunk status map for real-time DNHR".
International Switching Symposium, Paris, May 7-11, 1979, pp. 171-177, FR; E. Szybicki et al.: "The introduction of an advanced routing system into local digital networks and its impact on the network enconomy, reliability and grade of service".
International Teletraffic Congress, vol. 5, Sep. 1985, pp. 861-866, Elsevier Science Publishers, Amsterdam, NL; J. M. Garcia et al.: "Comparative Evaluation of centralized distributed traffic routing policies in telephone networks".

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