Getting TDR Functionality on In-Service Cable Lines

By Tom Williams – One of the tough decisions facing line technicians is deciding if suspected line damage is severe enough to warrant taking cable service down to shoot the line with a time domain reflectometer (TDR). This decision is no longer necessary as it is now possible to measure a standing wave on a block of digital signals, and accurately range the distance to a fault on in-service plant using live digital traffic as test signals.

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Scalar Testing (Part ONE)

By H. Mark Bowers – In my last column we examined digital QAM testing requirements under present FCC Part 76 Rules and ANSI/SCTE 40 2003 Requirements. In this column we’ll begin an examination of scalar testing and why it’s important in the HFC network.

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