DTX-PCU6S Patch Cord Adapters
Users Manual
6
Wire Map Failures
Wire map failures are typically caused by the following:
•
Wires connected to wrong pins at plug
•
Faulty connections
•
Damaged plug
•
Damaged cable
•
Wrong Outlet Configuration selected in setup
•
Mix of 568A and 568B wiring standards (12 and 36 crossed)
•
Conductive material stuck between pins at plug
Return Loss Failures
Return loss failures are typically caused by the following:
•
Cable impedance not 100
Ω
•
Patch cord handling causing changes in impedance
•
Excessive untwisting of pairs at plug
•
Poor quality plug
•
Cable impedance not uniform (poor quality cable)
•
Cable compression (pinches, kinks, etc.)
•
Poorly matched plug and jack (most often affects Cat 6/Class E applications)
•
Wrong test limit selected
The return loss plot can often tell you if a patch cord failed because of bad cable or a
bad plug:
•
Return loss failures at low frequencies (below 50 MHz) tend to be caused by the
cable.
•
Return loss failures at high frequencies tend to be caused by plugs.
Figure 2 shows examples of these failures. The plot on the left shows results from a
patch cord made with bad cable. The plot on the right shows results from a cord with a
bad plug.
