Polarity detector for subscriber lines

Details Polarity detector for subscriber lines Polarity detector for subscriber lines

1990-07-12

1992-03-24

Olms, Douglas W.

Pulse or digital communications

Repeaters

Testing

375 19, 371 56, H04L 2549, H04L 2534

Patent

active

050994972

ABSTRACT:
A polarity detector for subscriber lines in a data transmitting system which detects the polarity of 2-wire subscriber lines using 2B1Q codes. A converter converts a quaternary 2B1Q 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 "0"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 "0"s detected by the pattern detector. Therefore, correct data is received by correctly detecting the polarity of the subscriber line.

REFERENCES:
patent: 3560856 (1971-02-01), Kaneko
patent: 4003041 (1977-01-01), van Duuren et al.
patent: 4910750 (1990-03-01), Fisher
"Integrated Services Digital Network (ISDN)-Basic Access Interface for Use on Metallic Loops for Application on the Network Side of the NT"; American National Standards Institute, Inc., New York, N.Y.; ANSI T1.601-1988 (Approved Sep. 16, 1988).

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