Circuit arrangement for telecommunication switching systems conn

Details Circuit arrangement for telecommunication switching systems conn Circuit arrangement for telecommunication switching systems conn

1986-02-25

1988-06-28

Dwyer, James L.

Telephonic communications

Centralized switching system

Switching controlled in response to called station...

379333, 379334, H04Q 360

Patent

active

047544805

ABSTRACT:
A concentrator equipped with two processors is connected via two corresponding channel systems to a higher ranking exchange. Both processors operate independently of each other and poll all subscriber line circuits for switching codes. In the event that a channel system malfunctions, but the concentrator processor is operational, one processor transmits request signals, as well as an emergency operating state signal, to the subscriber line circuits. If the processor itself malfunctions, it transmits request signals and, in addition, an out-of-order state signal. The emergency operating signal and out-of-order signal are stored by each of the subscriber line circuits. Switching codes are transmitted to each of the two processors when both of these processors are in standard operating mode or in emergency mode. If one of the processors is in emergency mode and the other in standard operating mode, or one of them malfunctions and is in out-of-order mode and the other is in emergency mode, the switching code is transmitted only to the latter processor in each case.

REFERENCES:
patent: 4197427 (1980-04-01), Hutcheson et al.
patent: 4455645 (1984-06-01), Mijioka
patent: 4466098 (1984-08-01), Southard
Telcom Report, vol. 4 (1981), 71 pages.
Telcom Report 5 (1982), No. 4, pp. 262-266.

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