DSX-PCxx Patch Cord Adapters
Users Manual
6
Patch Cord Test Results
Patch cord tests evaluate these characteristics:
Wire map
Return loss
NEXT
The patch cord test specifications assume that insertion loss (attenuation), ACR-F
(ELFEXT), DC resistance, length, propagation delay, and delay skew requirements
are met by the patch cord's design, thus, test limits for these measurements are
not required.
Why Patch Cords Fail
Patch cords can fail because of faulty wiring, poor workmanship, poor quality
materials, or damage to the cable or plug.
When margins begin to get smaller and failures occur more frequently, your
adapters possibly need new jacks. If you characterized the adapters'
performance when the adapters were new, use the results and the reference
patch cord to evaluate the adapters' performance. See Appendix A.
The sections below give typical causes for wire map, return loss, and NEXT
failures.
