Comtech EF Data CDM-800 - Manual (Page 81)

CDM-800 Gateway Router Revision 1
Ethernet-based Remote Product Management MN-CDM800
5–21
• FEC Type – At present, DVB‐S2 is the sole available FEC type.
• Tx Frequency (950 to 2150 MHz for L‐Band, 50 to 180 MHz for IF) – Enter the Tx frequency
in MHz.
• Frame – Use the drop‐down menu to select the Frame type as Normal or Short. This field
will be forced to Normal if any MODCOD enabled in Group QoS (see Sect. 5.4.4.3.5.1) has a
code rate of 9/10.
• Pilots (read‐only) – This feature is always ON.
• Gold Code (000000 to 262141) – The Gold‐n Index indicates the Physical Layer spreading
sequence number. The default setting is all 0s.
• Roll Off – The Tx 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 Tx Alpha Rolloff (α) of the carrier as 20%,
25%, or 35%. The default selection is 20%.
• Spectrum Invert – Use the drop‐down menu to select the Tx Spectrum Invert as Normal or
Tx Spectrum Inverted.
• Power Level (‐40 to ‐5 dBm for L‐Band, ‐25 to ‐5.0 for 70/140 MHz) – Enter the Tx power
level, in dBm.
• Carrier State – Use the drop‐down menu to select the Tx Carrier State as either Off or On.
Select or enter the desired Tx Frequency, Tx Symbol Rate, Frame, Gold Code, Roll Off, Spectrum
Invert, and Carrier State settings. Click [Submit] to save.