User guide

OMNIScanner User Guide
5 - 6
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 at link is good
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 technology
(Standard Connector Band technology) can help you to distinguish between
connection faults and cable faults. It assists you with diagnosis and trouble-
shooting of Return Loss failures and the verification of test cables, connec-
tors 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.
S-Bands provide a time domain limit to verify that the connections are
within the desired category of performance. In a typical link, failures are a
result of either a non-compliant connection or a faulty cable. The ability to
determine if a connection meets the expected performance requirement
significantly simplifies the diagnosis of a failure.
Select TDRL in the DIAGNOSTICS screen and press ENTER. The TDRL
function is also available from the RETURN LOSS Graph screen.