User's Manual

D EKOLINK W IRELESS L TD . C OMPACT B I -D IRECTIONAL A MPLIFIER D EKO 3178B P RODUCT M ANUAL
Pub. 300TC80031 Rev. 1.55 Proprietary Data Page 19
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5 MONITORING AND ALARM
MONITORING AND ALARMMONITORING AND ALARM
MONITORING AND ALARMS
SS
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5.1 D EKO 3178B A LARMS
The Deko3178B Dual Band BDA has two main active elements: DL Power Amplifier and
UL power amplifier. A monitor circuit monitors these elements and initiates an alarm
upon detecting a deviation from the normal operation. The summarized alarm output of
the monitoring card is sent to the corresponding front panel Alarm connector.
The monitor circuit performs the following functions:
• Monitors the current of uplink power amplifier - If the current is either below or
above the specified limits an automatic alarm function is provided through a lit LED
and a dry contacts relay.
• Monitors the downlink RF output power - If the output power is lower than +20dBm
an alarm function is provided by a lit LED and a dry contacts relay.
Indication Cause Action
Downlink LED is
ON
Indicates low RF power at
downlink path <20 dBm)
Check base antenna connection
Check antenna alignment to base.
Use higher gain BDA
Downlink LED is
ON
BDA fault Replace BDA
Uplink Amp LED is
ON
Uplink amplifier over current
or undercurrent fault
Replace BDA