User manual

Chapter 2 - Managing a Single Device/Cell Air Interface Noise Floor Parameters Page
AlvariCRAFT Device Manager 71 User Manual
2.9 Air Interface Noise Floor Parameters
Page
The Calibration of Noise Floor Indication feature has been introduced to overcome
possible inaccuracies in the Noise Floor Calculation mechanism. The calibrated
Noise Floor Indication is used for correcting the displayed Noise Floor values
versus the values that are calculated/used by the internal noise floor calculation
mechanism.
A Field calibration should typically be performed for a new unit when Factory
calibration is not available, whenever the bandwidth (sub-band) is being changed,
or if the previous Field calibration process has failed.
Calibration can be performed only under the following conditions:
 The Spectrum Analyzer is not in progress
 There is no active TFTP or FTP session
 In an SU/RB, only if it is associated
If the calibration has started the unit will reset itself, will perform the calibration
and after that it will reset again and return to normal mode of operation.
If the calibration is running the user will not be able to start a spectrum analysis
or a TFTP/FTP session.
If the calibration failed the results of the previous successful calibration will be
kept. If the calibration passed, the new results will be used for Noise Floor
Indication.
The user can select to use one of the following calibration options: None, Field or
Factory.
If Factory option is available, indicating that the unit was calibrated in the factory,
this is the option that should be used (Factory calibration is not available in
current release).
If Factory option is not available, a Field calibration should be performed, and the
Field option should be selected.
The None option should be used only if the Field Calibration is repeatedly failing,
or if the RSSI displayed when using the Field option (following a “successful” Field
calibration) is clearly inaccurate, indicating erroneous results.