Alcatel-Lucent 9500 MXC User Manual page 306

Chapter 5. Antenna Alignment
Hot Standby
Space Diversity
Vol. III-5-6
This procedure details the additional steps required to ensure that no Tx
protection switching occurs during the alignment procedure, which may confuse
results. It assumes a common antenna at each end of the link.
For all RACs the online Rx manages Rx protection-switch management and
drives data to the backplane bus. This online function is not affected (no switch
will occur) under no-signal conditions, so it is not necessary to lock an Rx online.
For IDU 155o and IDU 20x the primary designated IDU is default online for Tx
and Rx. No Rx switch will occur under no-signal conditions, so it is not essential
to lock its Rx online.
1. At each end check the type of coupler installed; equal or unequal split.
2. For an unequal-loss coupler, check which RAC/IDU is connected to the
low-loss side, as this is the RAC/IDU which must be locked as Tx online at
both ends to assist signal acquisition.
• Default CT assignments for RACs have the primary RAC as online Tx and
the secondary RAC as online Rx. Assuming defaults have been retained, the
primary-designated RAC should have been assigned to the low-loss side
(check) and therefore the primary RAC must be locked as Tx online.
• For all RACs, Rx online may be left as Auto/Lock Off.
• For all IDUs the IDU assigned to the low-loss side should be locked online
for Tx and Rx. This should be the primary designated IDU (check).
• For an equal-loss coupler it does not matter which RAC/ODU is Tx/Rx
locked online at each end.
3. Use the CT > Diagnostics > System/Controls screen to check and set online
locks.
4. Use the Standard Alignment Procedure on page 5-5 to align the antennas, but
where unequal-loss couplers are installed always select the RAC/IDU
connected to the low-loss side to measure RSSI/RSL (default the primary
RAC/IDU).
5. Return the Protected Link controls to Auto/Lock Off on completion.
This procedure details the additional steps required to ensure that all four
antennas are in correct alignment and that during the alignment process no
unwanted Tx switching occurs.
1. Within the CT > Diagnostics > System/Controls screen check which RAC/
2
IDU is Tx online, and which is Rx online.
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