Comtec CDM-840 Installation And Operation Manual page 108

CDM-840 Remote Router
Ethernet-based Remote Product Management
Demodulator
The valid operating range for each item in this section is noted in parentheses.
•
Data Rate (read-only) – This section displays the data rate, which is a snapshot of the
MODCOD currently being received.
• Symbol Rate (1000 to 62000) – Enter the Active and Alternate symbol rates in ksps.
Click [Submit] to save.
The Alternate column and its defined Symbol and Data rates are used only when
the Automatic Demod Configuration Switch has been enabled.
• Rx Frequency (950 to 2150 MHz) – Enter the Active and Alternate Rx frequencies in MHz.
•
MODCOD – This section ALWAYS defaults to Auto mode.
• Gold Code (000000 to 262141) – The Gold-n Index descrambling code indicates the Physical
Layer spreading sequence number. The default setting is all 0s.
•
Es/No Alarm Point (0.1 to 16.0) –This value, as calculated by the demodulator, is the energy
per symbol bit (Es) divided by the noise spectral density (No). Enter the Es/No Alarm Point
value, in dB.
Click [Submit] to save.
The Alternate column and its defined Symbol and Data rates are used only when
the Automatic Demod Configuration Switch has been enabled.
• Roll Off (read-only) – The Rx Alpha Rolloff (α) dictates how fast the spectral edges of the
carrier are attenuated beyond the 3 dB bandwidth. Roll Off is identified here as 20%, 25%, or
35%.
•
Frame (read-only) – The Framing type is identified here as either Normal or Short.
6–26
MN-CDM840
Revision 3