Comtech EF Data CDM-800, Installation And Operation Manual

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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 0 s.
•
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.