Testing The Physical Layer; Testing Line Quality - Viavi OneExpert DSL User Manual

Chapter 4 TrueSpeed DSL Testing

Testing the physical layer

The line is connected. The modems begin to train on the lines automati-
cally.
NOTE:
You may see both lines sync, drop, and then re-sync again. This
is typical for bonded lines. The modems include a test probe that
syncs both pairs, drops, and then re-syncs in bonded mode.

Testing the physical layer

You can use the OneExpert DSL OneExpert DSL to test the physical layer
of the xDSL link. The following procedure describes the basic test for the
DSL link.
To perform a basic DSL link test
• Connect to the line and allow the unit to train on the line.
If the unit achieves sync, you have verified the physical layer.

Testing line quality

Once connected to the line, the OneExpert DSL OneExpert DSL gathers
statistics for the line. These statistics are used to determine the line quality.
To test line quality
1 Connect to the line. See
The modem begins the training process automatically. When it
reaches show time, the OneExpert DSL begins gathering statistics.
2 Use the Connection Details and DSL Graph buttons to view
different types of statistics.
Page 64
"Connecting to the line" on page
OneExpert DSL User's Guide
22052280, Rev 006
62.
November 2015