9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. III-5-7
• For RACs the default status has the primary RAC as Tx online, and the
secondary RAC as Rx online.
• For IDU 155o and IDU 20x the default status has the primary IDU as Tx and
Rx online.
2. Use the Protected Link controls to lock the primary RAC/IDU as Tx online at
both ends of the link. Rx online may be left as Auto/Lock Off
3
.
3. Use the Standard Alignment Procedure on page 5-5 to align each Rx antenna.
If RSL is to be used for alignment purposes, go to the Diagnostics >
Performance screen:
• For RACs, select the required Link from the Plug-ins menu.
• For IDUs display (side-by-side) the Diagnostics > Performance screen for
both IDUs.
4. Return the Protected Link controls to Auto/Lock Off on completion.
Frequency Diversity
This procedure assumes a common antenna at each end of the link and an equal
loss coupler.
1. Select one (any) RAC/ODU for RSSI/RSL measurement and use the Standard
Alignment Procedure on page 5-5 above to align each antenna. Providing
each link is operating normally there is no need to use the System/Controls >
Protected Link locks to lock a RAC to Tx or Rx online
4
.
Ring
Follow the Standard Alignment Procedure on page 5-5.
Additional Procedures for CCDP XPIC links
For CCDP (Co-channel Dual Polarized) XPIC (Cross Polarized Interference
Cancellation) links it is important that antenna feeds are correctly aligned to
achieve optimum XPIC performance.
2
The IDU 155o and IDU 20x can be installed for space diversity.
3
Rx online defines which receiver is passing traffic to the backplane bus/tributaries, but from a signal
strength viewpoint both receivers can be accessed to provide RSL/RSSI data.
4
Although the Diagnostics > System/Controls screen for Frequency Diversity provides locks for Tx and
Rx online, they define only the traffic connections through to the Node backplane bus; they do not affect
over-air status as each link operates as a distinct entity on separate frequency pairings.
Procedures are provided for the alignment of dual polarized antennas, and for
protected XPIC links.
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