Comtech EF Data CDD-880, Installation And Operation Manual

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CDD-880 Multi Channel Receiver MN-CDD880
Appendix A Revision 2
A–7
A.7 DPC (VMS Dynamic Power Control) Operation
The DPC (Dynamic Power Control) feature, provided in Comtech EF Data’s CDM‐840 and
ODM‐840 Remote Routers, provides a mechanism whereby remote satellite uplinks have their
transmit power levels adjusted in order to optimize the receive signal quality as measured by
the corresponding demodulator E
S
/N
0
(the ratio of energy per symbol to noise density). This
optimization process acts to either increase or decrease transmitted signal levels in order to:
•
Achieve a minimum level of received E
S
/N
0
consistent with providing an error free link or set
margin.
•
Reduce transmit power where sufficient link margin exists in order to optimize group station
uplink saturation and/or satellite transponder power usage reducing costs.
• Increase link availability when margins apply (typically Ku‐Band or Ka‐Band).
•
Maintain proper power backoff to eliminate high power amplifier saturation and carrier
distortion.
•
Appendix G. DPC (VMS DYNAMIC POWER CONTROL) in this manual
•
Appendix M. DPC (VMS DYNAMIC POWER CONTROL) in the Comtech EF Data
CDM-840 Remote Router Installation and Operation Manual (CEFD P/N
MN-CDM840)
• Appendix L. DPC (VMS DYNAMIC POWER CONTROL) in the Comtech EF Data
ODM-840 Remote Router / ODMR-840 Reduced Form Factor Remote Router /
ODMR-840B Remote Router Board Set Installation and Operation Manual
(CEFD P/N MN-ODM840)
•
Appendix H. DPC (VMS DYNAMIC POWER CONTROL) in the CTOG-250 Comtech
Traffic Optimization Gateway with CDM-800 Gateway Router Installation and
Operation Manual (CEFD P/N MN-CTOG250)