User's Manual

APEX1933 USER MANUAL V1.2 Tech Support: 1-888-317-8766
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• Gain Tracking sets UL gain equal to DL gain. The feature helps maintain forward and
reverse link balance. The function control is grayed out when AGC mode is on.
• Automatic Gain Control :
- In contrast to manual gain control, automatic gain control (AGC) sets gain such that the
desired amplifier output level (33dBm) is automatically set.
- The user controls gain by adjusting the AGC level. The user may set the level from 0dBm to
33dBm. AGC can be used to control the signal level radiated from the server antennas.
- AGC may also be user to match the equipment to a DAS (distributed antenna system). AGC
level may be restricted by available gain and DL input power.
• UL Gain offset is used in conjunction with AGC to reduce the amount of amplification in
the reverse direction (uplink). In the cases UL offset is set to 0dB.
• Automatic Shutdown (ASD) :
- ASD temporarily shuts down the amplifier if the ASD level is exceeded. It is not necessary to
turn off ASD. ASD events are stored in the alarm history log. Repeated ASD events will
eventually shutdown the amplifier permanently and trigger the external shutdown lamp.
- ASD Level is set to 36dBm by default. It is not necessary to change the default level.
How to prevent saturation or over-modulation
1. Hardware function
Input : If this device detect an over input signal, input hardware ALC will automatically
activated over
power rating+2dB within 100ns to protect it and in case of over ALC range
turn to Thru-Path by activating a relay to prevent from occurring
saturation of AMP and Digital board.
Output : If this device detect an over output signal, output hardware ALC will
automatically activated over
power rating+2dB within 100ns to prevent from occurring over output power.
2. Software function to adjust the maximum power output and secure linear operation
AGC(Automatic Gain Control) : automatically control the output power not to exceed
over the set value.
ALC : activating in AGC off condition to prevent from occurring over-output power
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