Maintenance
M7/M7L/M7LT Modular Satellite Modem
2-6
M7/M7L/M7LT - Rev. 0.05
2.3.6.7.
L-Band BUC and LNB Power (M7LT Only)
The M7LT modem has internal power supplies that have the capability to provide DC Voltage via the
L-Band Xmt and Rcv IF cable to a low power BUC and/or the LNB. The internal relays under
processor control and can be enabled or disabled using the front panel or remote control. The
processor also reads the voltage and current applied to the BUC and LNB and can create alarms in
addition to reading voltage and current at the front panel.
The rear panel LED next to the L-Band IF connector show status of the BUC and LNB voltage as
shown in Table 2-4 and Figure 2-5. Figure 2-4 shows the Prime Power and IF connector section of
the M7LT rear panel.
Figure 2-5
– M7LT Rear Panel indicators
Table 2-4 - Rear Panel BUC and LNB Status Indicator
Indicator Color
Meaning
Off
Power sensed but disabled (disconnected) from transmit cable.
Green
Power sensed and enabled (connected) to transmit cable
Red
Power sensed and enabled but a fault condition exists.