Multi-line access module for telephone set

Details Multi-line access module for telephone set Multi-line access module for telephone set

1987-09-25

1989-03-28

Ng, Jin F.

Telephonic communications

Multi-line or key substation system with selective switching...

Switching or supervision feature

379162, 379164, 379387, 379201, H04M 100

Patent

active

048171328

ABSTRACT:
A multiline access module for connection of a number of telephone lines to a station set. The station set is controlled by a microprocessor and communicates with the access module through a communications channel to select one telephone line for connection to the station and to read the line status, ringing, on-hook, seized, no connection, or hold, for each line; the microprocessor controlling audible and visual indicators accordingly. The access module monitors voltage levels on each line to determine the line status. Each access module includes apparatus for connection to first and second groups of telephone lines and when two modules are interconnected by an appropriately polarized cable each will activate a different connection apparatus, allowing two modules to be connected in parallel for greater line capacity.

REFERENCES:
patent: 3931481 (1976-01-01), Jackson
patent: 4061887 (1977-12-01), Kasson et al.
patent: 4395596 (1983-07-01), Leitman et al.
patent: 4490583 (1984-12-01), Bednarz et al.
patent: 4628153 (1986-12-01), Daly
patent: 4677661 (1987-06-01), van Gilluwe et al.

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