Identifier for manual switchboards with conference facility

Details Identifier for manual switchboards with conference facility Identifier for manual switchboards with conference facility

1978-10-20

1981-02-24

Brigance, Gerald L.

179 18FH, 179 91R, 179 27DB, 179 7R, H04M 504

Patent

active

042529980

ABSTRACT:
A line identifier at a telecommunication switchboard comprises a matrix of magnetic-induction elements serving as current sensors for detecting a request for establishing a connection between a selected incoming line and a selected outgoing line. The sensors are connected to a multiplexer for providing samples in a time-division mode to a logic circuit controlled by a pair of microprogrammers and addressing a read/write memory for storing information on the states of the sensors. The logic network, upon receiving from a sensor an identification request for a selected outgoing line, such request implicitly coding a selected input line, activates a relay which closes a circuit enabling the energization of a sensor whose output signal to the logic network identifies the outgoing line selected via the switchboard for connection to the prior-identified incoming line. Upon successful identification of a selected incoming line and at least one selected outgoing line, the logic network emits energization signals to a pair of relays which thereupon break the circuits energizing the sensors and establish a link between the selected incoming line and the selected outgoing line. The logic network is connected via its control microprocessors to a computer for communicating thereto the identities of interconnected lines. The logic network with its associated multiplexer and microprocessors may be duplicated for cross-checking operations.

REFERENCES:
patent: 3761635 (1973-09-01), Gibson et al.
patent: 3828140 (1974-08-01), Blane et al.
patent: 3959593 (1976-05-01), Mehta
patent: 4103113 (1978-07-01), Sato et al.

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