Comtech EF Data CDD-880, Installation And Operation Manual

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CDD-880 Multi Receiver Router MN-CDD880
Appendix G Revision 2
G–4
Reference power is complete . Although modulator minimum power (-40 dBm) is still important,
it is not as critical to overall performance. The best balance for nominal operation is somewhere
in the middle of the range, leaving headroom on the top and bottom. This range balance is
extremely important when operating the network in dSCPC, as the system varies symbol rate
and power.
For more information on CDM-840 commissioning and cabling considerations, see
Comtech EF Data Quick Reference Document QR-CDM840.
G.2.2.2 Operational Essentials
Three basic criteria apply to power control function:
•
Power Reference
•
Rated Maximum Power
•
Terminal Maximum Power
Each plays an important role in constraining and maintaining power adjustments on the fly, with
range check parameters, Tx Power Margin, and Maximum Data Rate providing power
constraints.
Figure G-1. DPC Power Scale