Comtech EF Data CDD-56X Series Vipersat - Manual (Page 78)

Vipersat Configuration MN/22137, rev 1
3-44 Vipersat CDD-56X Series User Guide
Primary Heart Beat
This menu item appears for the Hub terminal only.
The Primary Heart Beat feature is a redundancy heart beat message for
primary Hub units that provides the option for a periodic communications check
message to be sent from the Hub modem to the VMS for backup recovery in
N:M redundancy (protected) configurations. The message interval is hard-coded
in the demod.
Enter P at the command prompt in the Vipersat Configuration screen
(figure 3-6) to toggle this feature between Enabled and Disabled.
Home State Revert
This menu item appears for the Remote terminal only.
The Home State Revert feature allows automatic resource recovery to be
performed on SCPC connections when a communications failure occurs
between the VMS and a Remote, such as a rain fade condition, a Remote unit
power down, or a hardware failure. The period of time (in minutes) for a failure
is configured in the VMS for each Remote in the network. Should communica-
tions be lost for more than the specified time period, the Remote will automati-
cally revert to its Home State settings and the VMS will remove all allocated
resources (bandwidth, demod(s)), freeing them for use by any other Remote in
the Vipersat network.
Because this feature is configured in the VMS, the status (Disabled, or the time
period in minutes) appears as an information-only display in the Vipersat
Configuration menu (figure 3-6).
Dynamic Power Control Configuration
Dynamic Power Control (DPC) is a Vipersat feature that acts to regulate the
transmit power of the Vipersat satellite modem, such that the specified receive
signal level (E
b
/N
o
) is met for the receiving Vipersat units in the group. DPC is
driven by the receiver demod, which notifies the transmitting modem of the
current E
b
/N
o
value.
Refer to Appendix C, “Dynamic Power Control”, in this document for addi-
tional information on the DPC feature.
The Dynamic Power Control Configuration screen (enter C in the Vipersat
Configuration menu) allows for setting the parameters for the CDD-56X power