Comtech EF Data CDM-840 Installation And Operation Manual page 62

CDM-840 Remote Router
Ethernet Management
• DVB-S2 QPSK 2/3
• DVB-S2 QPSK 3/4
• DVB-S2 QPSK 4/5
• DVB-S2 QPSK 5/6
Gold Code [0 – 262141] – The Gold-n Index descrambling code indicates the Physical Layer
spreading sequence number. The default setting is all 0s.
Roll Off – The Rx Alpha Rolloff (α) dictates how fast the spectral edges of the carrier are
attenuated beyond the 3 dB bandwidth. With 20% rolloff the edge falls off more quickly than with
25% and 35%.
Use the drop-down menu to set the expected filter Rx Alpha Rolloff (α) of the carrier as 20%,
25%, or 35%. The default selection is 20%.
Es/No Alarm Point [0.1 – 16.0] – Enter the Es/No Alarm Point value, in dB. This value, as
calculated by the demodulator, is the energy per symbol bit (Es) divided by the noise spectral
density (No).
Frame (read-only) – The Framing type is identified here as either Normal or Auto.
Pilots (read-only) – Pilots operation is identified here as Off, On, or Auto.
Spectrum Invert (read-only) – Spectrum Inversion operation is identified here as either Normal
or Rx Spectrum Inverted.
Once the desired configuration settings have been made on this page, click [Submit] as needed to
save these changes.
• DVB-S2 8-PSK 8/9
• DVB-S2 8-PSK 9/10
• DVB-S2 16-APSK 2/3
• DVB-S2 16-APSK 3/4
5–16
Revision 0
MN-CDM840
• DVB-S2 32-APSK 5/6
• DVB-S2 32-APSK 8/9
• DVB-S2 32-APSK 9/10