Installation
700-814-112-01, Revision 01
8
November 24, 1999
UTU-814 List 1B
HDSL S
TARTUP
AND
S
YNCHRONIZATION
Power up the shelf or enclosure where the UTU-814s are installed and
observe the following:
1
The HDSL SYNC LEDs should flash once per second as the units
attempt to establish synchronization.
2
After approximately 30 seconds, confirm one of the following:
•
The two HDSL SYNC LEDs are not blinking and the HDSL ALM
LEDs are off, indicating the units are synchronized and ready to
transmit and receive data. The units can now be configured through
the console screen menus.
•
One or both of the HDSL SYNC LEDs continue to blink after
approximately one minute. This indicates that the HDSL pair that
corresponds to the LED is experiencing an excessive signal loss or
is in an open condition. Check the line and repair if necessary.
An LTU holds the configuration settings for both itself and the remote NTU.
After the two units establish synchronization, the LTU checks if the remote
NTU is the same type (that is, the same model number). If the NTU type is
the same, the LTU configures the NTU to the settings held by the LTU. If the
NTU type is different, the LTU configures the NTU to its factory default
settings.
Each unit performs a brief power-up self test. During the test,
the front-panel LED indicators flash in an incremental binary
sequence to indicate the test in progress. If the LEDs stop
incrementing, the unit has failed the self-test. If this happens,
note the final LED display pattern and contact PairGain
customer service at +714.832.9922 for assistance.
