Comtech EF Data ODM-840 - Manual (Page 115)

ODM/R-840 Outdoor Remote Router Revision 0
Ethernet-based Remote Product Management MN-ODM840
5–27
When Adaptive Coding and Modulation (ACM) is set to Enable, the Data Rate
is set automatically (manual configuration of Data Rate is disabled), and the
appearance of the Data Rate section changes as follows:
• Symbol Rate (16‐4500 ksps) – Enter The ODM/R‐840 Tx Symbol Rate in ksps. Click [Submit]
to save.
• FEC Type – At present, VersaFEC is the sole available FEC type.
• Tx Frequency (950‐2150 MHz) – Enter The ODM/R‐840 Tx frequency in MHz.
• MODCOD – Use the drop‐down menu to select the Modulation type and FEC rate
(MODCOD). The available selections are:
o
VersaFEC MODCOD 0 – BPSK 0.488
o
VersaFEC MODCOD 6 – 8-QAM 0.711
o
VersaFEC MODCOD 1 – QPSK 0.533
o
VersaFEC MODCOD 7 – 8-QAM 0.780
o
VersaFEC MODCOD 2 – QPSK 0.631
o
VersaFEC MODCOD 8 – 16-QAM 0.731
o
VersaFEC MODCOD 3 – QPSK 0.706
o
VersaFEC MODCOD 9 – 16-QAM 0.780
o
VersaFEC MODCOD 4 – QPSK 0.803
o
VersaFEC MODCOD 10 – 16-QAM 0.829
o
VersaFEC MODCOD 5 – 8-QAM 0.642
o
VersaFEC MODCOD 11 – 16-QAM 0.853
• Tx Scrambler – Use the drop‐down menu to select the Tx Scrambler as Off or Normal.
• 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 0 dBm) – Enter the Tx power level in dBm.
• Carrier State – Use the drop‐down menu to select the Tx Carrier State as Off or On.
Select or enter the desired FEC Type, Tx Frequency, MODCOD, Tx Scrambler, Spectrum
Invert, and Carrier State settings. Click [Submit] to save these settings.