Calling signal controller

Details Calling signal controller Calling signal controller

1991-07-03

1993-06-01

Schreyer, Stafford

Telephonic communications

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

Switching or supervision feature

379159, 379172, 379173, 379254, H04M 900, H04M 172

Patent

active

052167089

ABSTRACT:
A calling signal controller in which a calling signal generator having a necessary and minimum output capacity is used to the most efficiently possible extent. The controller includes a phase number memory specifying the total number of phases of calling signals used to selectively call a plurality of telephone sets, a ringing count memory loaded with a ring count for each of the phases, and a ringing control memory of which addresses are associated with the phase numbers and the ringing counts, thereby controlling the calling signals.

REFERENCES:
patent: 4602132 (1986-07-01), Nagatomi et al.
patent: 4605824 (1986-08-01), Birlmeier et al.

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