HDSL Startup and Synchronization
350-819-200-01, Revision 01
10
November 12, 1999
HLU-819 List 1
HDSL S
TARTUP
AND
S
YNCHRONIZATION
Power-up the shelf where the HLU-819 is installed and observe the
following:
1
During the power-up self test, the HLU-819 List 1 LED is a steady
yellow. If the LED stays yellow for more than 30 seconds after power-up,
verify the unit is not in a loopback mode. If no loopback conditions are
present, the unit has failed the self test. (See
if assistance is required).
2
The Status LED flashes green once per second as the unit attempts to
establish synchronization.
3
After approximately 30 seconds, confirm one of the following:
•
The Status LED is steady green, indicating the unit is synchronized
and ready to transmit and receive data. The unit can now be
configured through the maintenance terminal console screen menus.
•
The Status LED continues to flash. If the LED does not stop flashing
after approximately one minute, it indicates that the HDSL pair
corresponding to the indicator is experiencing an excessive signal
loss or is in an open condition. Check the line and repair if necessary.