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LTPS-UM-8054-01
T
ESTING
This section provides information on troubleshooting the Soneplex system. Several methods are available for
isolating trouble in the system:
•
An end-to-end test observing the LED status lights on the H4LXC and the H4LXR units
•
SCU alarm screens
•
Loopbacks
E
-
-E
T
ND
TO
ND
EST
This procedure provides instructions for testing the central office H4LXC and the remote H4LXR for proper
end-to-end operation. The installation of the remote system must be complete to perform this procedure.
H4LXC End-to-End Test
1
Partially remove the H4LXC module from the chassis to disconnect power from the module.
2
Inform the technician at the remote location that the end-to-end test may be initiated.
An H4TU-R-402 List 5A must be installed at the remote location to initiate the end-to-end test.
3
Re-install the H4LXC in the chassis and observe the front-panel LED indicators. Verify that each LED
operates as specified in the following list. If the LED indicators respond as specified, continue with Step 4.
If the STAT LED is red, the H4LXC has failed the self-test diagnostics. Remove and reinsert the H4LXC;
•
then wait while the H4LXC again performs the self-test diagnostics. If the STAT LED lights red at the
end of the second self test, the H4LXC is defective. Remove the H4LXC, replace it with a new module,
and repeat Steps 1 through 3.
If the HDSL4 CONT/SNR LED is yellow, the signal to noise ratio on the HDSL4 loop is below the
•
threshold value (default setting is +5 dB equivalent noise margin). Correct as specified by local
troubleshooting practice.
If the HDSL4 LOSW/BER LED momentarily flashes yellow, an intermittent CRC error is being detected
•
on the HDSL4 loop. Verify that the loop is within CSA specifications and that all connections are good.
Correct as specified by local troubleshooting practice.
If the HDSL4 LOSW/BER LED is red, the HDSL4 loop is not synchronized. Verify that the remote
•
H4LXR is installed properly and that all HDSL4 loop connections have been completed.
The synchronization process may take approximately 90 seconds to complete. The HDSL4
LOSW/BER LED will be red or blinking green until loop synchronization is complete.
When DISP RMT (Display Remote) is initiated from the APU, the STAT, LBK, HDSL4 CONT/SNR,
and L1 and L2 LOSW/BER indicators on the H4LXC will illuminate to represent the H4LXR LED
conditions.
LPS-H4TU-C-L5
December 3, 2003
Testing
25
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