Trunk apparatus for loop dialing trunk line

Details Trunk apparatus for loop dialing trunk line Trunk apparatus for loop dialing trunk line

1994-03-14

1995-01-24

Dwyer, James L.

Telephonic communications

Plural exchange network or interconnection

379225, 379399, 379229, H04M 700

Patent

active

053848390

ABSTRACT:
A common mode noise removing apparatus connected to connection lines between switching networks, for a loop dial relay line, includes a direct current power source for applying a predetermined direct current voltage to the connection lines, a reverse flow preventing unit connected between the direct current power source and the connection lines, a power supply control supervision unit for supervising the power supply condition of the loop current which flows in a loop, and a short-circuit unit for short-circuiting the reverse flow preventing unit in a mode in which no dial pulse is received by the apparatus from another such apparatus and the power supply control supervision unit detects the loop current.

REFERENCES:
patent: 3637946 (1972-01-01), Hamrick

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