Telecommunications terminal with improved control functions

Details Telecommunications terminal with improved control functions Telecommunications terminal with improved control functions

1989-07-24

1991-04-16

Ng, Jin F.

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

379370, 379387, 379433, 358 85, H04N 712, H04M 172

Patent

active

050089242

ABSTRACT:
A telecommunications terminal is provided which has a central unit (100) and a handset (200). The handset houses a microphone (210) and a speaker (220) and is connected to the central unit via a cord (300). The connecting cord has a plurality of wires (301-304) for conveying output signals from the microphone and input signals to the speaker. The telecommunications terminal incorporates at least one function under the manual control of its user. That function is controlled by a switching means (l1, l2; 230) housed in the handset, with the corresponding control signals being conveyed along said cord in the form of phantom D.C. voltages.

REFERENCES:
patent: 3792205 (1974-02-01), O'Dea
patent: 4122304 (1978-10-01), Mallien, II
patent: 4523056 (1985-06-01), Fisher
patent: 4567332 (1986-01-01), Jamison
patent: 4583214 (1986-04-01), Miyashita et al.
patent: 4646344 (1987-02-01), Goldhorn et al.
patent: 4856045 (1989-08-01), Hoshina
W. B. Cagle et al., "2C Video Telephone Station Set", Bell System Technical Journal, vol. 50, No. 2, Feb. 1971, pp. 271-312.

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