Hand-held telephone line signaling test instrument

Details Hand-held telephone line signaling test instrument Hand-held telephone line signaling test instrument

1988-06-29

1989-06-27

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Using portable test set

379 26, 379 29, H04M 124, H04M 332

Patent

active

048436208

ABSTRACT:
A hand-held telephone line signaling test instrument is described which provides test and timing measurment for telephone lines employing DID, DOD and POTS trunk lines. The hand-held instrument is capable of sourcing wink-start reverse battery protocol and DTMF, dial pulse or MF dial codes for testing a DID trunk. The device also incorporates a termination impedance and dial code receivers for DTMF, dial pulse and MF dialing codes. Analysis and comparison of the timing and measurements is performed by an internal microprocessor-based system with the results of the measurements displayed on an LCD alphanumeric display.

REFERENCES:
patent: 4194098 (1980-03-01), Carlson

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