ProsKit 15-AT002, User Manual

16

Notes:  
Cross talk increases with the length of the cable. 
A LAN system will tolerate a certain amount of 
cross talk. A short cable (10ft or less) that is 
improperly) paired may work just fine. However, 
longer cables paired in exactly the same way, 
may not work. This explains why an installer can 
make short jumper cables that work (although 
they are improperly paired), but when he installs 
RJ-45’s in exactly the same way on a longer 
cable, the cable does not work.   

6.3 The 4 in 1 says my phone cable is bad, but 
my phone works ok.   

Most single line telephones only use 2 wires in 
a modular cable the modular cable, which 
terminates in RJ-11 connectors could have as 
may as 6 wires in it. The unused wires may 
have faults, which the 5 in 1 identifies, but 
these faults may have no effect on the working 
2-wrie telephone circuit. Many telephone 
cables with RJ-11 plugs/jacks are wired 
inverse. The 4 in 1 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 0 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. If connected 
in reverse polarity, the touch-tone phone may 
not dial out (no touch), and the answering