Protection devices and arrangements for telephone lines

Details Protection devices and arrangements for telephone lines Protection devices and arrangements for telephone lines

1988-09-29

1989-10-24

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 57, 361 91, 361 95, 361111, 361119, 379331, 379412, H02H 324

Patent

active

048766208

ABSTRACT:
A two-wire telephone subscriber line protection arrangement consists of two protection devices each comprising a pair of complementary thyristors connected in reverse parallel with one another between a respective wire and a reference point, with their gates connected together and directly to a control terminal which has a connection to the wire via a resistance which determines an overcurrent threshold level for the device. The reference point is ground for the ring wire protection device, and is desirably the ring wire for the tip wire protection device, whereby a directional sensitivity of the protection devices is taken advantage of and the overcurrent threshold level can be reduced. Zener diodes connected between complementary thyristors provide for convenient overvoltage protection.

REFERENCES:
patent: 4408248 (1983-10-01), Bulley et al.
patent: 4710791 (1987-12-01), Shirato et al.
SGS Telecom Products Databook, 3rd Edition, Jul. 1986, pp. 1, 35, 36 and 37.

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