Comtec CDM-840 Installation And Operation Manual page 121

CDM-840 Remote Router
Ethernet-based Remote Product Management
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Rated Maximum Power (read-only) – This displays the highest value that DPC will raise the
power to during normal operation. This value is calculated from the references, Maximum
Data Rate, and Tx Power Margin.
o Click [Recalculate Max Power] to recalculate the Rated Maximum Power whenever you
change the Tx Power Margin and/or the Maximum Data Rate.
o Click [Reset Max Power] to set the Maximum Power to an invalid value. Use this setting
when recalibrating references, when the previous settings do not allow DPC to reach the
target Es/No.
o Click [Reset All Parameters to Factory Default] to completely disable DPC, remove the
references, and to return all settings to the factory default.
Tx Dynamic Power Control (DPC) Status
Once reference calibration is complete, this section provides information on the ongoing DPC
state. Each received LQRM updates this status section; any changes to power are noted
between Target Es/No and Current DPC Delta.
After the targeting of reference calibration, the DPC Delta is zeroed, and any +/- offset from this
point indicates power changes due to link quality variations.
Depending on symbol rate, small rates will have variations up to ±.5 dB, even during
clear-sky conditions.
Item
Current Beam offset
Target Es/No
Last Es/No Received
Current DPC Delta
Time since last LQRM
Power Reference
Click [Set Reference] to place the system into a calibration mode. Selecting this adjusts the Tx
Power to achieve a BER of 10
and Reference Symbol Rate. You may use these three Power Reference values to calculate an
equivalent power for any MODCOD/Data Rate combination.
Description
Current Beam offset is modified in a roam configuration, and any +/- offset
from zero either adds or subtracts from the margin or terminal maximum
power backoff during a beam contour variation.
Target Es/No is calculated from maximum MODCOD and will remain
constant unless changed.
This most recent reported value may change depending on link conditions.
This represents the Adaptive Control Loop (ACL) change in power compared
to the set reference, which can increase to margin or terminal maximum
power. Any decrease has the full remaining range down to -40 dBm of
modulator's output.
This is the time, in seconds, from the last power report received. Under
normal conditions, the status updates every 60 seconds.
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, and then stores this value along with the Reference MODCOD
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MN-CDM840
Revision 3