Patch Cord Test Results
5
DTX remote tester
DTX main tester
Patch cord
under test
TALK
MONITOR
ENTER
TEST
SAVE
SPECIAL
FUNCTIONS
SETUP
AUTO
TEST
SINGLE
TEST
EXIT
F1
F2
F3
TEST
LOW BATTERY
TONE
TALK
FAIL
TEST
PASS
TALK
DTX-PCU6/MN
patch cord adapter
DTX-PCU6/SR
patch cord adapter
bal04f.eps
Figure 1. Patch Cord Test Connections
Patch Cord Test Results
Patch cord tests evaluate the following:
•
Wire map
•
Return loss
•
NEXT
The patch cord test specifications assume that dc resistance, length, propagation delay,
and delay skew requirements are met by the patch cord's design; therefore, test limits
for these measurements are not required.
Note
NEXT loss and return loss are measured in one direction only, as required
by the patch cord test standard. For standard patch cords up to 5 m this
method is adequate and can detect performance problems at the remote
connection. For longer patch cords, Fluke Networks recommends
repeating the test with the patch cord reversed.
Why Patch Cords Fail
Patch cords may fail because of faulty wiring, poor workmanship , poor quality
materials, or damage to the cable or plug.
Failures may also occur when the patch cord adapter jacks need replacing or a patch
cord adapter is defective. If the adapters' performance was characterized when the
adapters were new, use the results and the reference patch cord to check the adapters'
performance. See Appendix A.
The following sections give typical causes for wire map, return loss, and NEXT failures.
