Link circuit for intercom unit

Details Link circuit for intercom unit Link circuit for intercom unit

H - Electricity

04

M

379/33, 379/44

H04M 3/42 (2006.01) H04M 1/72 (2006.01) H04M 9/00 (2006.01) H04M 9/04 (2006.01)

Patent

CA 1071784

C. Matheny - 4 LINK CIRCUIT FOR INTERCOM UNIT ABSTRACT OF THE DISCLOSURE: An intercommunication link for a multiple link key telephone system with a combination lamp-button on each handset for each available link. In each link, a line seeking intercom service is sensed to operate a relay in the link selected. A lamp flash signal on the lamp of the selected link is initiated. In this condition, all other links are disabled and none can be accessed when one link is in the lamp flashing condition. The called local number of the desired intercom station is dialed and when the called station line is answered, a second relay in the selected link operates to release the first relay. On operation of the second relay, a steady lamp indication is sent to both stations in the conversation. Other free links may be accessed at this time. Thus, only during this intercom signaling phase are the remaining free links affected. -1-

258817

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