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User's Manual

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USU
USER MANUAL
DCM000000104
Printed: 03.05.21,10:40
Revision Date:5/21/03
16
Gain Adjustment is necessary to compensate for the variations in the Fiber-Optic
components of the Head-End and Remote Modules. This must be done after
Modules are deployed in a System, and anytime a Module is replaced. The
adjustments are on an individual RF Path basis, and each path is adjustable
downwards in 1dB steps up to -15dB.
It is recommended that these adjustments be performed with the aid of a Signal
Generator and Spectrum Analyzer.
Uplink Gain:
The Uplink Gain is adjusted at the Head-End Module on an individual RF path basis.
Please refer to the Head-End DIGATTN Commands in the Configuration and PC
Commands section. All DIGATTN Values are set to 0 (Maximum RF Gain). While
monitoring the RF gain via measurements, the individual gain paths are adjusted
downwards with the DIGATTN command to meet the Specified Gain. This will
optimize / balance both gain and noise.
Downlink Gain:
The Downlink Gain is adjusted at the Remote Module an individual RF path basis.
Please refer to the Remote DIGATTN Commands in the Configuration and PC
Commands section. All DIGATTN Values are set to 0 (Maximum RF Gain). While
monitoring the RF gain via measurements, the individual gain paths are adjusted
downwards with the DIGATTN command to meet the Specified Gain. This will
optimize / balance both gain and noise.
Signal Level Adjustment is necessary to ensure that the Downlink RF Carriers
transmitted via the Remote Modules are not generating undesired intermodulation
products, nor are they being distorted beyond use. Refer to the earlier section on
Remote Module Per-Carrier De-Rating.
It is recommended that these adjustments be performed with the aid of a Signal
Generator and Spectrum Analyzer, and that they be done AFTER the Gain
Adjustments.
Adjust the Downlink Interface Amplifiers and/or attenuators between the Base
Station (see the Typical Application drawing) to achieve the specified de-rated per-
carrier level.
Uplink Signals should be monitored as they feed into the Base Station - this is
usually a site specific requirement.
Gain Adjustments
Signal Level
Adjustments