Alcatel-Lucent 9500 MXC User Manual page 313

Space Diversity Protection
3DB 23063 ADAA - Rev 004 July 2007
• Follow the Procedure for Dual Polarized Antennas on page 5-8.
• Return the Protected Link controls to Auto/Lock Off on completion.
• To check protected operation on each link, refer to Protection Switching on
page 1-6, Volume V, Chapter 1. Bear in mind the remote Tx mute conditions
detailed in Remote Tx Mute on page 3-123, Volume II, Chapter 3.
This alignment procedure summarizes the steps required to ensure all four
antennas are in correct alignment for pan and tilt, and skew angle. It combines
elements of the procedures for Cross Polarized Antennas, and for Space
Diversity Antennas.
The top antenna should be connected to the primary V and H RACs; the lower
antenna to the secondary V and H RACs. Figure 5-2 illustrates a CCDP space
diversity configuration.
Procedure:
1. Static feedhead skew-angle alignment.
Align all four antennas using the static feedhead alignment procedure
described under Procedure for Dual Polarized Antennas on page 5-8. This
step would normally be completed in conjunction with antenna pan and tilt.
2. Antenna pan and tilt alignment
Use the CT > System Controls screen to lock the transmitters at both ends to
primary.
Each each end of the link align both top and bottom antennas using the
standard (co-plane) alignment procedure. Use just one of the links for this
purpose, normally the V link. Refer to Standard Alignment Procedure on
page 5-5.
When correct, proceed to step 3.
3. Check RAC 40 Operation and End-End Feedhead Alignment
Check that both V and H links are operating normally and are alarm-free.
Use the Performance screens to check that:
• Tx power measurements are within 1 dB (typically) on all RACs. If not
check Tx power settings.
• RSL measurements are within 2 dB an all RACs. See Using RSL Data on
page 5-2 for guidance on measurement accuracy.
9500 MXC User Manual
Vol. III-5-13