Connection polarity switching apparatus

Details Connection polarity switching apparatus Connection polarity switching apparatus

1991-06-14

1993-01-26

Gaffin, Jeffrey A.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307112, H02B 124

Patent

active

051824663

ABSTRACT:
An apparatus which is inserted in a signal transmission path between a network communications cable and a sending and receiving circuit. The apparatus enables switching of the connection polarity of the communications cable. This apparatus has an idle status detection section, a judgment section which responds to an idle status detection of the idle status detection section and judges the polarity of the communications cable on the basis of a signal level of the communications cable, and a polarity switching section which switches the polarity of the signal send and receive in accordance with a polarity indicated by polarity judgment signals output from the judgment portion. The use of this apparatus eliminates the necessity to recognize the polarity when connection work is performed, and simplifies the connection work itself.

REFERENCES:
patent: 3624338 (1971-11-01), Ellis
patent: 3648059 (1972-03-01), Beaudry et al.
patent: 3731179 (1973-05-01), Rademaker
patent: 4520419 (1985-05-01), Locher et al.

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