Microtest OMNIScanner2 Guide de l'utilisateur télécharger pdf (Page 84)

OMNIScanner User Guide

6 - 6

NEXT in the cable is the source of the failure

even though the cable’s NEXT response peaks

are less than those of the connection. By

knowing that the connection meets its perfor-

mance requirement, the cable is easily identi-

fied as the non-compliant component of the

link.

The following table summarizes the typical

diagnosis process.

NEXT TDNXT exceeds Conclusion

S-Band limits

PASS N/A NEXT of link is within limits

FAIL YES Connection fails. Replace or reterminate.

Plug and/or jack can be at fault.

FAIL NO Cable is not within specifications

TDRL

Return Loss is a measure of the amount of reflected energy in a link.

Reflections occur at points of impedance discontinuity, such as connectors,

transitions from patch cables to horizontal cables, and impedance structure

within a cable.

Return Loss faults are diagnosed by using the TDRL (Time Domain Return

Loss) function. OMNI

Scanner

uses TDRL to determine the amount of

Return Loss as a function of distance. TDRL with new S-Band™ technol-

ogy (Standard Connector Band technology) can help you to distinguish

between connection faults and cable faults. It assists you with diagnosis

and troubleshooting of Return Loss failures and the verification of test

cables, connectors and plugs.

While the Return Loss graph shows the link test limits and the frequency at

which a failure occurred, the TDRL graph displays Return Loss vs. dis-

tance.

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 132 133

Pas de commentaire

Microtest OMNIScanner2 Guide de l'utilisateur Page 84