Comtech EF Data VMS v3.12.x Vipersat - Manual (Page 284)

Devices MN/22156, rev 12
4-66 VMS User Guide
Rx Terminal Mix
The Terminal Mix polarity for the received signal can be set per site
requirements:
• [+] indicates a high side, inverting mix (default)
• [–] indicates a low side, non-inverting mix
Gold Code
Caution: Changing this parameter setting will disrupt both management and
data traffic over the link, and communications with the Hub will be
lost. A technician will have to restore communications by setting the
gold code for the CDM-800 modulator to match (see “Devices | Mod”
on page 4-58).
To minimize disruption of communications between Hub and
Remotes when changing this parameter, utilize the “Alternate”
configuration feature that is available through the WSI. Refer to the
modem Operation Manual for details.
The Gold Code is the physical layer spreading sequence number, or
spreading factor to be applied (for instances of low power), and can be set
from 0 to 262141 chips/bit. Default is 0.
Es/N0 Alarm Point
The receive E
s
/N
0
level that will generate an alarm condition for this Remote
can be set with this parameter.
Valid range is -3.0–32.0 dB. Default is 0.
For the CDD-880 Hub unit, clicking on the Demod 1 menu item presents the
receiver configuration settings for the VersaFEC return path from the Remote
(figure 4-42). This unit can have up to 12 individual demodulators.
The essential parameter settings are as follows:
Click the Enable check box to enable the demodulator for network use.
Specify the receive Frequency.
Specify either the Data Rate (for VersaFEC receive) or the Symbol Rate
(for VersaFEC ACM receive).
Select the ModCod for this demod to receive.
Define the Circuit ID (4–32 characters). This identifier will appear in the
Parameter View area of ViperView.