Basic Cable Testing 7

Troubleshooting Basics

Table 7-1. Identifying Cable Faults (continued)

Examples of Test Displays and Plots

gc63i.eps

Wire map display showing short between pins 1 and 2.

NEXT test fails.

Impedance anomaly is

detected.

gc64i.eps

gc65i.eps

TDR results showing short 78 ft

TDR plot of results shown at left.

from test tool.

 

gc66i.eps

TDX plot showing NEXT caused by excessive untwisting of cable

pair at far-end connector.

gc67i.eps

TDR plot showing impedance anomaly caused by a 150Ω cable

segment in a 100Ω run.

7-25

Page 137
Image 137
Fluke DSP-100, DSP-2000 user manual Next test fails Impedance anomaly is Detected