Telephone test device

Details Telephone test device Telephone test device

1987-03-23

1988-07-05

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of trunk or long line

379 22, 379 26, H04B 346

Patent

active

047560177

ABSTRACT:
The device is inserted at the jack between the tip-ring signals of a telephone company's line and the customer's telephone lines and equipment to isolate the location of telephone problems. A first tri-color light emitting diode shows either "off" or "green" when a problem is detected, "red" if a telephone company line reversal exists, or "yellow" upon detection of a ring generator signal. When problems are detected, a switch is manually positioned to connect a second tri-color LED between the tip and ring signals while disconnecting the first tri-color LED and the telephone equipment. If the second tri-color LED is "off" then there is no dial tone; if it is "green" then the tip-ring signal lines are reversed; if it is "red" then the problem is within customer-owned telephone equipment. A battery test of the tri-color LED's is optionally incorporated. A variant test device connected at a RJ21 jack for testing ground start telephone trunk lines is also disclosed.

REFERENCES:
patent: 3976849 (1976-08-01), Champan
patent: 4323738 (1982-04-01), Merrick
patent: 4369341 (1983-01-01), Ahuja
patent: 4413163 (1983-11-01), Basini
patent: 4443669 (1984-04-01), Kopetzky
patent: 4513176 (1985-04-01), Fostveit
patent: 4544807 (1985-10-01), Sers
patent: 4581494 (1986-04-01), Pickens

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