PairGain ETU-772, Quick Installation Manual, Page: 17 / 32

700-722-900-02, Revision 02 Installation
UTU-722 and ETU-772 List 1 June 21, 1999 11
HDSL S
TARTUP AND
S
YNCHRONIZATION
At startup, a HiGain-ETSI RS LTU confirms that it is communicating with a
HiGain-ETSI RS NTU. The LTU then synchronizes the NTU configuration
with its own configuration.
Power up the LTU and NTU. The following synchronization sequence should
occur:
1 Power up the shelf or enclosure where the unit(s) are installed.
2 Confirm the following:
•
The HDSL ALM LED is on and the HDSL SYNC LED flashes once
per second as the units self-configure and establish synchronization.
•
After approximately 60 seconds the HDSL ALM LED is off and the
HDSL SYNC LED is a steady green. The units are now ready for
configuration through the console screen menus.
If the HDSL SYNC LED continues to flash after 90 seconds,
the HDSL line is faulty, the Local Unit Role is not configured
as LTU, or one of the units is not a rate selectable unit. Check
for the correct line units and Local Unit Role. Test the HDSL
line using the loopbacks described in technical practice
700-722-100-xx.
The LTU and NTU will reset and their LEDs will sequence
through the startup cycle following any change to the HDSL
Payload Rate option (see
“System Settings” on page 15 ).