Comtech EF Data MBT-4000B - Manual (Page 32)

Multi-Band Transceiver System Revision 0
Redundant Configuration MN/MBT4000B.IOM
4-4
The following commands and rules configure operation of this feature.
Step Procedures
1 The power supply provides +18V with a 450 mA current limit.
2 The bias tee supply is controlled by issuing the ‘LCS=2m’ command as follows:
a. ‘‘m’ is the mode. Valid values are 0=OFF or 1=ON.
3 In case of excessive current (more than 450 mA), the supply will be disabled and a fault will be
posted. The ‘LCS=2m’ command must be sent again to re-enable the supply.
4 To enable programmable current monitoring, the following steps are taken:
a. The desired output is enabled as outlined above.
b. The nominal current is calibrated using the CLC=2 command.
c. The programmable current window is specified using the LCW=2xx command. Where ‘xx’
is the allowable percentage of variance from nominal (set by the CLC command).
Acceptable values for ‘xx’ are 20 to 50 in increments of 1%. In addition, a value of ‘99’ for
‘xx’ disables the alarm function.
d. If a current is detected outside this window, a LNB current fault will be posted, but the
supply will not be disabled.
4.5 Gain Equalization of Redundant Units
Uplink Gain equalization in an MBT-4000B system is accomplished by issuing individual
attenuation settings to the specific BUCs.
4.6 LED Status Indicators
The two LED indicators reflect the status of the MBT-4000B as follows:
For the Online status:
Steady GREEN No faults present and the unit is not muted.
Steady YELLOW No faults present and the unit is muted.
Steady RED The unit is faulted.
For the Offline status:
Blinking GREEN No faults present, the unit is not muted.
Blinking YELLOW No faults present, the unit is muted.
Blinking RED The unit is faulted.