Polarity detector for subscriber lines

Details Polarity detector for subscriber lines Polarity detector for subscriber lines

H - Electricity

04

M

379/2

H04M 3/22 (2006.01) H04L 25/49 (2006.01)

Patent

CA 2021295

ABSTRACT A polarity detector for subscriber lines in a data transmitting system which detects the polarity of 2-wire subscriber lines using 2BlQ codes. A converter converts a quaternary 2BlQ code into binary code and outputs complementary binary data. A frame synchronizing signal detector detects a binary code frame synchronizing signal in the complementary binary data and outputs a timing signal. A pattern detector detects an all "1"s or "O"s state of the complementary binary data and the timing signal. A selector circuit selects all complementary data having a single polarity in response to all "1"s or "O"s detected by the pattern detector. Therefore, correct data is received by correctly detecting the polarity of the subscriber line.

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