Protection arrangement for a telephone subscriber line...

Details Protection arrangement for a telephone subscriber line... Protection arrangement for a telephone subscriber line...

H - Electricity

04

M

323/6, 379/67

H04M 7/00 (2006.01) H02H 3/06 (2006.01) H02H 3/087 (2006.01) H04M 3/18 (2006.01)

Patent

CA 1260171

PROTECTION ARRANGEMENT FOR A TELEPHONE SUBSCRIBER LINE INTERFACE CIRCUIT Abstract of the Disclosure A telephone subscriber line is connected to a SLIC via contacts of an isolation relay, Line voltage on the line side of the relay contacts, and line current on the SLIC side of the relay contacts, are detected during opposite polarity half-cycles of an a.c. fault on the line, and the contacts are opened to protect the SLIC if the voltage and/or current is excessive. The interruption of current causes the line voltage to rise to maintain the protection for the duration of a fault. -i-

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