Comtec CDM-840 Installation And Operation Manual page 109

CDM-840 Remote Router
Ethernet-based Remote Product Management
•
Pilots (read-only) – Pilots operation is identified here as Off or On.
• Spectrum Invert (read-only) – Spectrum Inversion operation is identified here as either
Normal or Rx Spectrum Inverted.
Automatic Demod Configuration Switch
The Automatic Demod Configuration Switch allows you to enable and configure the "Alternate
Demod" functionality. This feature allows you to pre-stage a new configuration for the
outbound carrier – i.e., increase, decrease, or move the CTOG-250's Outbound carrier. It is
expected that this will be done as part of normal operations.
Do these steps:
Step Task
1 Define the new desired outbound carrier parameters (symbol rate, frequency).
2 Configure the "Alternate Demod" configuration for all CDM-840s on the same Outbound Carrier
(CTOG-250).
3 Configure the CTOG-250 to the new matching Tx parameters.
4
At this point, all of the CDM-840s will unlock from the old carrier, wait the "Initial Switch Timer" seconds and
then try to Receive Lock to the "Alternate Demod" configuration.
5 If the initial attempt fails, then the demod will switch back and forth between the Active and the Alternate
configuration until lock is achieved. This will occur every "Search Switch Timer" seconds.
6
Once a lock occurs, the successful configuration becomes the "Active" configuration and the other
configuration becomes the "Alternate" configuration.
• Switch Enable – Use the drop-down list to set automatic switching between demod
configurations as Enable or Disable.
•
Initial Switch Timer – Enter a value from 10 to 3600 seconds. Use this setting to specify how
long to wait after the demod goes unlocked before trying to lock onto the "Alternate
Demod" parameters.
• Search Switch Timers – Enter a value from 30 to 3600 seconds. Use this setting to specify
how long to wait between alternating attempts to "search" for the correct demod
configuration. The "search" will stop once the demod has successfully locked onto the
CTOG-250's carrier.
Click [Submit] to save.
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MN-CDM840
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