Miniature bridge lifter for telephone lines

Details Miniature bridge lifter for telephone lines Miniature bridge lifter for telephone lines

H - Electricity

04

M

379/43, 379/45,

H04M 19/00 (2006.01) H04Q 5/02 (2006.01)

Patent

CA 1121528

MacPherson-McNair 9-6 MINIATURE BRIDGE LIFTER FOR TELEPHONE LINES Abstract of the Disclosure A miniature electronic bridge lifter for bridged telephone lines which can be mounted directly on the protector unit in the central office includes an impedance inserted serially in each side of the loop for isolating the nonactive loops from the central office termination and for switching to a low impedance connection whenever a party on one of the bridged line connections goes off-hook. A combination semiconductive and resistive voltage divider detects the voltage across the loop. The resistive component is essentially the only cross-coupling between the telephone lines. When the line voltage falls below a preselected threshold, indicating that the connected party has gone off-hook, a switch is operated to bypass the series impedances and establish a low- loss path to the common line. -i-

320483

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