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Many telephone cables with RJ-11 plugs / jacks
are wired in reverse. The CNT 10 L will show
that a cable like this is crossed. A cable like this
reverses the polarity of the telephone line. Most
regular telephones made in the last 20 years are
not polarity sensitive. So, even though the cable
is wired in reverse (crossed), it may work OK.
Early touch-tone telephones and answering
machines were polarity sensitive. lf connected in
reverse polarity, the touch-tone phone may not
dial out (no touch), and the answering machine
may not answering machine may not answer
when the line rings.
7 .6.4 The CNT 10 L says my RJ-11 phone
cable is good, but my phone doesn‘t work.
First, make sure the telephone line is active.
The “good“ cable may result in a reversed line.
The line is not actually being reversed in the
good cable it‘s been reversed somewhere else
along the wire. Either the reversed cable can be
located and corrected, or, an oftenused simpler
approach is to replace the good cable with a
reversed cable, making the polarity come out
correctly. It is also worth knowing that some
female/female couplers reverse the polarity of
the phone line.
Analog telephones will usually work, regardless
of line polarity. Digital phones are often polarity
sensitive, and may not work with reversed line
polarity.
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