Automatic refresh of operating parameters in equipment with...

Details Automatic refresh of operating parameters in equipment with... Automatic refresh of operating parameters in equipment with...

H - Electricity

04

J

354/246

H04J 3/00 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 1269178

ABSTRACT OF THE DISCLOSURE A set of operating parameters that define the functions of a data unit interfacing a subscriber's terminal to a 2-wire telephone loop and which are stored in a volatile memory of a microcomputer in the data unit may be changed or periodically refreshed from the same parameter set stored in a volatile memory of a micro- computer in a data line card that functions as a datapath interface of a central data and voice communication facility. Bidirectional data transmission on the loop occurs via time compression multiplexing which requires synchronization between the interfaces. Loss of synchronization indicates the likelihood of a power interruption at the data unit and consequent erasure of memory. The presence of synchronization is tested and upon a positive indication the operating parameters are downloaded from the data line card to the data unit.

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