Comtech EF Data MBT-4000 - Manual (Page 76)

MBT-4000 Multi-Band Transceiver System Revision 4
Redundancy Configuration / Operation MN/MBT4000.IOM
C–4
b. ‘m’ is the mode. Valid values are 0=OFF or 1=ON.
4. In case of excessive current (more than 350 mA), the supply will be disabled and a fault
will be posted. The ‘LCS=sm’ command must be sent again to re-enable the supply.
5. 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=s command, where ‘s’ is the source
as described previously.
c. The programmable current window is specified using the LCW=sxx command.
Where ‘s’ is the source as described previously and ‘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 LNA current fault will be posted, but
the supply will not be disabled.
C.6 Gain Equalization of Redundant Units
Gain equalization in an MBT-4000 system is accomplished by issuing individual attenuation
settings to the specific BxCs.
C.7 Operational Configuration Commands
In automatic redundancy mode, configuration commands (with the exception of attenuation and
LNA power supply configuration) sent to the online unit will be mirrored in the offline unit. In
auto mode, commands sent to the offline unit will be rejected.
In manual mode, configuration commands are not mirrored. However, upon reverting to “auto”
mode, online unit configuration will transfer to the offline unit, again with the exception of
attenuation and LNA power supply configuration.