Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent
1989-07-10
1990-08-21
Ng, Jin F.
Telephonic communications
Supervisory or control line signaling
Signal reception at substation
379396, 362 88, H04M 100
Patent
active
049513117
ABSTRACT:
A telephone includes a lamp pivotally mounted to the telephone housing. An inductive pick-up detects an incoming call on a telephone line and actuates a switching device to energize the lamp if the ambient light level adjacent the telephone is below a predetermined level as determined by a photosensor on the telephone housing. After disconnection of the call, a time delay circuit de-energizes the lamp after a predetermined time interval. The ambient light level at which the lamp will be illuminated and the time delay between call disconnection and lamp shut-off are programmable by a user. A manual override switch allows activation or deactivation of the lamp independently of detection of an incoming call or the ambient light level.
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"Automatic Indoor Night Light", Radio Shack, 1986, Catalog, p. 146.
Kearns Jerry T.
Ng Jin F.
Vaas Randall S.
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