Trunk identification system

Details Trunk identification system Trunk identification system

1986-11-26

1988-07-19

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of trunk or long line

379 25, H04M 330

Patent

active

047590491

ABSTRACT:
An improved trunk identification system for identifying an inbound trunk line selected by a telephone company routing system upon completion of a test routine by associated test equipment. The improved trunk identification system provides for multiplexed use of dual-tone multi-frequency receivers and decoders so as to ensure reliable and economical detection of a specified DTMF tone used to signal the completion of a test routine.

REFERENCES:
patent: 3898396 (1975-08-01), Gushue et al.
patent: 3943298 (1976-03-01), Clark et al.
patent: 4286118 (1981-08-01), Mehaffey et al.
patent: 4403119 (1983-09-01), Conklin et al.
patent: 4467148 (1984-08-01), Stafford et al.

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