Two-wire telecommunications line detection arrangements

Details Two-wire telecommunications line detection arrangements Two-wire telecommunications line detection arrangements

H - Electricity

04

M

379/2, 379/67

H04M 19/00 (2006.01) H04M 3/22 (2006.01)

Patent

CA 1315030

TWO-WIRE TELECOMMUNICATIONS LINE DETECTION ARRANGEMENTS Abstract of the Disclosure A loop closure detector for a two-wire telephone line comprises a four-arm resistive bridge, in which the four arms are constituted respectively by a first battery feed resistor, the two- wire line in series with a second battery feed resistor, and two resistors forming a potential divider across the battery voltage which is coupled across one diagonal of the bridge. A voltage sensing circuit, constituted by a comparator or a light emitting diode, is connected across the other diagonal of the bridge to provide an output representing a loop closure state of the line. A ring-ground detector is also described using a similar bridge and voltage sensing arrangements.

614820

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