Comtech EF Data VMS v3.12.x Vipersat - Manual (Page 280)

Devices MN/22156, rev 12
4-62 VMS User Guide
Enabling this parameter will randomize the data stream to be transmitted, result-
ing in the following:
• Elimination of long ‘0’-only and ‘1’-only sequences.
• Creating energy dispersal of the carrier signal to realize coding gain for the
receiver, such as when there is no traffic being passed and power is
concentrated in a narrow frequency band.
Carrier State
Set the Carrier State to On to enable the modulator to transmit. Default is Off.
For the CDM-840, the Carrier State is automatically managed by the VMS once
the unit has registered with the active server.
Terminal Mix
Set the Terminal Mix to [+] or [–], as required for the site.
• [+] indicates a high side, inverting mix (default)
• [–] indicates a low side, non-inverting mix
Framing
This parameter appears for CDM-800 units only.
Specify the DVB-S2 transmit frame length to be used, Long (normal) or Short
block.
Note that the following ModCods are not supported for Short Framing:
QPSK 1/2, QPSK 9/10, 8-APSK 9/10, 16-APSK 9/10, and 32-APSK 9/10.
Interface Type
This parameter appears for CDM-800 units only.
The Interface Type is fixed at IP.
Link Adaptation
This parameter appears for CDM-840 units only.
Note: All VersaFEC ACM requires the correct firmware to be installed in both
the CDM-840 Remote Router and the CDD-880 Multi-Receiver Router
(version 1.3.2 or higher), and the appropriate FAST code for the maxi-
mum operating symbol rate.
NOTE