Chapter 4
COAX Cable Field Calibration and Testing
TROUBLESHOOTING COAX CABLING
Always use high quality connectors and tools to properly terminate COAX network. In
case of a cable fail, look for the following cases:
¾
FAULTY TERMINATION - Make sure you have properly separated the center
conductor from the shield.
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CABLE SHORT - This could occur from improper termination both at near-end
and far-end. In case of a SHORT, look for the Resistance value on the tester. A
zero (0) – Ohm resistance value will suggest the fault is at the near-end of the
cable, while a ~ 20 – Ohm value will suggest the fault is at the far-end.
¾
CABLE OPEN - A common case. To diagnose this situation, look at the cable
length measurement. A zero (0) cable length will suggest a fault at the near-
end.
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USE of TDR to Diagnose Problem - The LANTEK build-in copper TDR is a good
tool to identify the location of the fault and distance of the fault. Refer to the
TDR operation in this manual for more details.
4-4
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