Arrangement for initializing a CENTREX console interface circuit

Details Arrangement for initializing a CENTREX console interface circuit Arrangement for initializing a CENTREX console interface circuit

1985-12-24

1987-11-10

Dwyer, James L.

Telephonic communications

Centralized switching system

Switching controlled in response to called station...

379267, 379229, H04M 342

Patent

active

047062797

ABSTRACT:
An arrangement for initializing an interface circuit connected between a CENTREX equipped central office exchange and a remotely located attendant console. The arrangement includes an operating unit residing in the interface circuit. The operating unit includes a controller connected to memory and to the CENTREX. The controller receives an initialization signal from the CENTREX and returns an initialization in progress signal. Memory verification called next by the controller ascertains if all locations in the memory are operable. The controller sends an error signal to the CENTREX in the event the memory verifications detects an error. Next, interface initialization called by the controller resets and clears a sequential memory and resets and clears a send/receive circuit connected to the controller and the attendant console. Transmission verification called next by the controller checks if the transmit and receive loop between the attendant console and the interface circuit is operable. Finally, an attendant console reset is called by the controller which sends a reset data message to the attendant console. In response to a successful reset of the attendant console the controller sends an initialization complete signal to the CENTREX.

REFERENCES:
patent: 4210782 (1980-07-01), Fujita

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