Comtech EF Data VMS v3.12.x Vipersat - Manual (Page 374)

Switching Out-of-Band Modems MN/22156, rev 12
7-18 VMS User Guide
7. Enter the channel Bit Rate and the reference Power level for the Managed
unit (left side).
The VMS uses the reference power setting as a basis for calculating the
correct power level for the carrier when setting up a switch event.
8. If a priority setting is applicable for this unit, click on the Priority check box
to activate this field (checked) and enter the required level.
Note that a lower number corresponds to a higher priority level. The default
value (0) equates to No priority.
9. For modem units that are Vipersat-enabled (not SNMP), the Extra Settings
parameters are available for configuration. Set the FEC and Modulation as
required.
10. Click on the Unmanaged Unit bar to select the modem that this site will be
linking to.
The Select Object window will open containing the top level components for
the network, such as the satellite(s) and groups or sites.
11. Navigate through the Select Object window to select the corresponding
modem unit that will be used for this circuit (figure 7-13) and click OK.
Take care to ensure that the unit selected is the correct one. If groups are
displayed, double-click on the group that holds the target site. Double-click
on the target site to display the subnet list, then double-click on the subnet
that holds the target modem.
The Unmanaged Unit bar will now be labeled with the name of the selected
unit.
12. By default, the channel Bit Rate, the reference Power level, the Priority (if
applicable), and the Extra Settings (if applicable) for the Unmanaged unit
(right side) mirror the settings that were entered for the Managed unit. To
modify these settings, click on the Symmetrical check box to uncheck/deac-
tivate this feature, then edit the field(s) as necessary.
13. Set the Fixed bit rate feature—either Enabled (checked) or Disabled
(unchecked)—based on the application requirements.
By default, this box is unchecked. In this state, the VMS will provide a best
effort to allocate the requested bandwidth at switch set up; if the full
bandwidth is not available, the circuit will be set up using a bit rate that falls
between the requested rate and the site minimum. A diminished rate may be
acceptable, such as for modem units that utilize Ethernet as the primary data
interface, for example.