Howler tone sending-out system in time-division electronic excha

Details Howler tone sending-out system in time-division electronic excha Howler tone sending-out system in time-division electronic excha

1982-01-27

1985-02-26

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

H04J 312

Patent

active

045021392

ABSTRACT:
A subscriber circuit in a time-division telephone switching system having a supervisory circuit connected to a subscriber telephone set for supervision of incoming calls, call-answering, line-busy and on-hook supervision on the telephone set. A common control circuit receives signals from the supervisory circuit through a scan circuit and when it receives a signal indicating that the handset has not been properly replaced. A howler tone source of a howler tone transmission circuit generates a low-level howler tone signal which is modulated by a modulator in the howler tone transmission circuit. This modulated tone signal is applied to a demodulator in the subscriber circuit through a speech connecting network for the transmission of speech to and from the telephone set without further need of connecting link such as a trunk line or the like. The telephone set converts the demodulated tone signal to a continuous howler tone audible signal.

REFERENCES:
patent: 3851110 (1974-11-01), Kelly et al.
patent: 3985965 (1976-10-01), Fields et al.
patent: 4380064 (1983-04-01), Ishikawa et al.

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