Arrangement for determining switch port status at an adjunct pro

Details Arrangement for determining switch port status at an adjunct pro Arrangement for determining switch port status at an adjunct pro

1990-03-30

1992-01-21

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379377, 379384, 379 10, 379 89, 379201, 379 34, 379337, 379266, H04M 322

Patent

active

050833081

ABSTRACT:
An arrangement that enables an adjunct processor to determine the service status of switching system communication ports to which the adjunct processor is connected, without reliance on switch-to-adjunct status-conveying messages. In-service and idle ones of the ports participate in calls on a rotating basis. Following receipt of N calls, where N is the number of in-service ports connected to the adjunct processor, the arrangement determines whether each port that is presently designated as being in-service and idle has participated in one communication before a port has participated in a second communication. The arrangement then treats as out-of-service any port presently designated as being in-service that has been so determined a predetermined number of sequential times. It also selectively designates as in-service ports that have participated in communications since the last determination had been made.

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patent: 4623760 (1986-11-01), Binkerd et al.
patent: 4893248 (1990-01-01), Pitts et al.
patent: 4922520 (1990-05-01), Bernard et al.

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