Comtech EF Data CDM-740 - Manual (Page 101)

CDM-740 Advanced Satellite Modem Revision 0
Ethernet Management MN-CDM740
6–17
Selections are as follows:
• Auto • DVB-S2 QPSK 3/4 • DVB-S2 16-APSK 2/3
• DVB-S QPSK 1/2 • DVB-S2 QPSK 5/6 • DVB-S2 16-APSK 3/4
• DVB-S QPSK 2/3 • DVB-S2 QPSK 8/9 • DVB-S2 16-APSK 5/6
• DVB-S QPSK 3/4 • DVB-S2 QPSK 9/10 • DVB-S2 16-APSK 8/9
• DVB-S QPSK 5/6 • DVB-S2 8-PSK 3/5 • DVB-S2 16-APSK 9/10
• DVB-S QPSK 7/8 • DVB-S2 8-PSK 2/3 • DVB-S2 32-APSK 3/5
• DVB-S2 QPSK 1/4 • DVB-S2 8-PSK 3/4 • DVB-S2 32-APSK 2/3
• DVB-S2 QPSK 1/3 • DVB-S2 8-PSK 5/6 • DVB-S2 32-APSK 3/4
• DVB-S2 QPSK 1/2 • DVB-S2 8-PSK 8/9 • DVB-S2 32-APSK 5/6
• DVB-S2 QPSK 3/5 • DVB-S2 8-PSK 9/10 • DVB-S2 32-APSK 8/9
• DVB-S2 QPSK 2/3 • DVB-S2 16-APSK 3/5 • DVB-S2 32-APSK 9/10
Frame (S2 Only)
Active only for DVB-S2 Mode, use the dropdown menu to select the Framing type as either Normal
or Short.
Pilots (S2 Only)
Active only for DVB-S2 Mode, use the dropdown menu to select the Pilots as either Off or On.
Gold Code (S2 Only)
Active only for DVB-S2 Mode, the Gold-n Index descrambling code indicates the Physical
Layer spreading sequence number. The valid range can be set from 0 to 262141. The default
setting is all 0s.
Roll Off
Active only for DVB-S2 mode, 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 dropdown menu to set the expected filter Rx Alpha Rolloff (
α) of the carrier as 20%,
25%, or 35%. The default selection is 20%.
Note: This menu is not valid in DVB-S mode, where the Rx Alpha Rolloff (
α) is fixed at 35%.
Spectral Inversion
Use the dropdown menu to select the Spectral Inversion as either Off or On.
Polarity
To set the polarity for the downconversion mix in the LNB, use the dropdown menu to select the
Polarity as Off, Horizontal (18V), or Vertical (13V).
22 KHz LNB Tone
To set the 22KHz tone outbound from the L-Band connector per DiSEq 4.2, use the dropdown
menu to select the tone as either Off or On.
Once the desired configuration settings have been made on this page, click [Submit] as needed to
save these changes.