Testing The Physical Layer; Testing Line Quality - JDS Uniphase HST-3000 User Manual

Chapter 2 DSL Testing
Testing in single-line modem emulate mode
Testing the
physical layer
Testing line
quality
20
You can use the HST-3000 to test the physical layer of the
xDSL link. The following procedure describes the basic test
for the xDSL link.
To perform a basic xDSL link test
– Connect to the line and allow the unit to train on the line.
If the unit achieves sync at the desired data rates, noise
margins, and attenuation, the xDSL link is good.
Once connected to the line, the HST-3000 gathers statistics
for the line. These statistics are used to determine the line
quality.
To test line quality
1 Connect to the line.
The modem begins to train on the line automatically.
When it reaches show time, the HST-3000 begins gath-
ering statistics.
NOTE:
This screen shows actual results and full synchronization.
If you are not connected to the line, or have not reached
"Show Time", the data flow (the "0" and "1" line) will not
appear and any results displayed will reflect the previous
test.
HST-3000 xDSL Testing User's Guide