Key telephone system

Details Key telephone system Key telephone system

1986-03-18

1987-07-21

Rubinson, Gene Z.

Telephonic communications

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

Detail of hold circuitry

379162, 379156, H04M 342, H04M 100

Patent

active

046823530

ABSTRACT:
A key telephone system has a plurality of telephone sets, each set having a hold button for temporarily holding a central office ("CO") line. A plurality of cell park lamps temporarily indicate which of the CO lines is being held. A plurality of call park buttons are individually associated with the call park lamps. An outgoing call button is used for seizing an idle one of the CO lines when an outgoing call is to be initiated. An answer button is used for seizing one of the CO lines over which an incoming call is being received. At least one external indicator indicates the various states (busy, idle, holding) of each of the CO lines. A central unit has a hold control circuit for indicating with the call park lamps when the CO line is being held responsive to an operation of either the hold button or a call park button. A CO line selecting circuit is provided for selecting and seizing an idle one of the CO lines, in response to an operation of the outgoing call button, and one of the CO lines over which an incoming call is being received in response to an operation of the answer button. A CO line indication control circuit controls the external indicator to indicate the states of the CO lines.

REFERENCES:
patent: 4046972 (1977-09-01), Huizinga et al.
patent: 4109113 (1978-08-01), Allison, Jr. et al.
patent: 4132860 (1979-01-01), Rasmussen
patent: 4150257 (1979-04-01), Fenton et al.
patent: 4196316 (1980-04-01), McEowen et al.

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