User's Manual

Chapter 6 DSL Testing
Testing the physical layer
SmartClass TPS User’s Guide
58 22035456, Rev 001 May 2014
Connecting to a single pair at the NID/demarc
To connect to a single twisted pair using the “Y” cable
1 Connect the single end of the test cable to the jack on the side of the SmartClass.
2 Connect the blue end of the cable to Modem on the NID/demarc.
The line is connected.
Connecting to bonded pairs at the NID/demarc
To connect to bonded twisted pairs
1 Using the RJ-45 “Y” cable, connect the single end of the “Y” test cable to the jack on the side
of the <product name>.
2 Connect the blue end of the cable to Modem 1 and the orange end of the cable to Modem 2 on
the NID/demarc.
The line is connected. The modems begin to train on the lines automatically.
If one of the pairs is not capable of bonding, or the pairs do not bond, a red error message box
appears.
Testing the physical layer
You can use the SmartClass Triple Play Services to test the physical layer of the ADSL 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 SmartClass Triple Play Services gathers statistics for the line.
These statistics are used to determine the line quality.
To test line quality
1 Connect to the line. See “Connecting to the line” on page 57.
The modem begins the training process automatically. When it reaches show time, the Smart-
Class Triple Play Services begins gathering statistics.
2 Use the DSL Summary results menu to view different types of statistics.
If the unit achieves sync at the desired data rates, noise margins, and attenuation, the ADSL
link is good.
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.