Microtest OMNIScanner2 User's Guide download pdf (Page 86)

OMNIScanner User Guide

6 - 8

Using TDRL to Diagnose a Link

S-Bands provide an easy method to pinpoint if the fault is located at the

connection or at the cable. The S-Bands allow you to determine if the

connections in a link meet the desired performance level. They are de-

signed to match the standard category of the selected Autotest.

A graph containing peaks that are located outside the S-Band at the

connection distance indicates that the connection and not the installed

cable failed.

If Return Loss fails but the TDRL graph displays peaks within the S-Band

at the connection distance, the fault is caused by the cable portion of the

link.

If failures occur at both ends of the link, use or to diagnose

each end. Failures at both ends of the link can interact.

TDRL Examples

The following examples show the diagnostics process that is performed to

identify failures on typical links with 2 meter test cables.

GOOD CABLE, BAD CONNECTION:

The cursor in the Return Loss graph is located at

the worst Return Loss at 135.2 MHz, which is

outside the limit line. (For display purposes the

cursor was moved.) The Link failed. Why?

Press to open the TDRL screen to further

review and diagnose the graph.

The cursor is positioned at the worst peak, which is

outside the S-Bands.

Looking at the TDRL graph we can reach the

conclusion that the connection located at 2 meters

did not meet the required performance and is the

cause of failure.

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Microtest OMNIScanner2 User's Guide Page 86