CDM-840 Remote Router MN-CDM840
Appendix M Revision 3
M–11
M.2.3.2 LQRM Failure and Recovery Steps
Figure M-4 provides the flow chart of the LQRM and Power Management Send and Adjust Logic.
Figure M-4. LQRM / Power Management Flow Diagram
1. If the LQRM indicates a loss of lock, the new power value is immediately set to the rated or
maximum power as an attempt to regain communication.
2. Once the power value changes, a timer prevents further power value or ModCod changes
for a duration of 800 ms; this helps prevent the CDM-840 from modifying the power value
on the basis of stale data.
3. If a CDM-840 hasn't received an LQRM from the CDD-880 in 120 seconds (two consecutive
slow rate missed messages), it drops into recovery mode, adjusting the power value to rated
or maximum adjusting ModCod to BPSK.
4. Once in recovery mode, a timer is set for an additional 120 seconds. If that timer expires
with no message from the CDD-880, the CDM-840 removes that CDD-880 from its internal
control list and waits for the next LQRM. At that point, the CDM-840 is done with that
particular unit and may either continue ACM and DPC to any other CDD-880 that is reporting
in, or just maintain the Tx at BPSK and at the increased power level until it again hears from
any CDD-880.
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