Telecommunications system, particularly a telephone exchange sys

Details Telecommunications system, particularly a telephone exchange sys Telecommunications system, particularly a telephone exchange sys

1984-02-27

1986-12-02

Schreyer, Stafford D.

Telephonic communications

With usage measurement

Call traffic recording or monitoring

379198, 379279, H04M 1526

Patent

active

046266259

ABSTRACT:
For the purpose of averting overloads at control units for groups of subscriber-associated or call-associated switch devices, a counter is incremented with every occupation and deincremented cyclically. The counter emits an overload signal upon the attainment of a limiting value, the overload signal being forwarded to that switch device or being assigned in a memory shared by the switch device to that switch device from which the occupation signal that leads to the immediate attainment of the limiting value in the counter has arrived. The overload signal is formed in the time between occupation and the first selection character, leads to the emission of a corresponding audible character (busy signal) and prevents the acceptance of selection characters. Alternatively, when the counter reaches the limiting value due to an occupation, the information corresponding thereto are still accepted, but a next occupation is not accepted until sufficient time for a corresponding number of deincrementation steps has elapsed.

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Lucky, "A Flexible Experimental Digital Switching Office", Int. Zurich Seminar on Digital Communications, Proc. IEEE, Cat. 78, No. 9, pp. A4.1-A4.4.
Horiki et al., "Design Philosophies on Local Digital Switching Systems", Int. Zurich Seminar on Digital Communications, Proc. IEEE, Cat. 78, No. 9., pp. B2.1-B2.5.

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