Signalling device for key telephone systems

Details Signalling device for key telephone systems Signalling device for key telephone systems

H - Electricity

04

M

379/33, 379/44,

H04M 3/42 (2006.01) H04M 1/72 (2006.01)

Patent

CA 1049170

Abstract of the Disclosure The present invention relates to a device which is to be used in conjunction with key telephone system, as for example, intercom system. More particularly, the invention consists of a device for decoding the pulse output from rotary dial telephones, indicating which digit has been dialed and selectively signalling the called party. Special features include acceptance of a wide rage of pulse speeds and ratios with decoding immunity to the initial hookswitch closure and the last opening. The latter per- mits the digit "1" to used, providing for an additional signal function. A decoding matrix operates a relay tree with provisions for either single or tow-digit codes. The device is intended for use in key telephone system which include rotary dial telephones.

266593

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