User's Manual

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This chapter describes additive functions of SMDR-NH124.
7.1 Shutdown function (TX output shutdown)
The DAS has an automatic shutdown function to protect the DAS itself and the wireless
network when the normal operational conditions cannot be maintained
The DAS shut down automatically when the composite power downlink output power is
above the values defined as average for the device for a period not to exceed
5seconds. Criterion level is set through GUI
After automatic shutdown, the DAS may automatically turn-on in order to assess
whether the temporary condition has changed. If the condition is still detected, the DAS
shall shutdown again. These actions will be repeated 5 times
After 5time repetition, if the condition is still detected, the DAS will be shutdown
permanently. The following diagram shows the shutdown logic
After the retry logic exhausts itself, if the DAS still detected a fault status then the DAS
will shutdown permanently and illuminate the fault via visual fault indicator
Permanent shutdowns of the DAS will also be reported to the NOC through the NMS
7.2 Total Power Limit function (TX Output ALC)
In order to protect HPA and not to radiate spurious emission, output power don’t
radiate above defined value which operator set in advance. To execute this function,
operator should turn-on the ALC function and set limit level through GUI. If the output
power exceed above the defined value, output attenuator is adjusted to operate within