Comtech EF Data VMS v3.12.x Vipersat - Manual (Page 287)

Chapter 4 - Configuring Network Modems 4-69
MN/22156, rev 12 Devices
Figure 4-43 Block Down Converter dialog, CDM-840
The 10 MHz Reference setting provides the option of having the Remote unit
supply an external reference for the LNB LO.
If this unit will be providing power for the LNB, select the appropriate DC
Power voltage, then set the Low and High Current threshold Alarm Limits
(0–500 mA).
Devices | BUC
This menu item appears for CDM-840 units only.
Click on the BUC menu item to configure the Remote Upconverter settings
(figure 4-44).