User's Manual

Axell D-SBR 3709S Repeater
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd Doc PN 00038UMCD Rev. 1.6 25
If the composite output power exceeds the defined value, the Smart ALC
feature begins working.
• Set the Max Composite UL Output Power according to your site
requirements.
Additional parameters (not required for initial setup) are:
• Oscillation Prevention Enable - Enables oscillation detection mechanism
that maintains repeater functionality.
• Temperature - Displays Repeater ambient temperature.
• DL Output Threshold Delta (dB) - the delta from the set Composite Output
Power, below which the alarm 'Donor power is too low' is activated.
For example, if the DL Output Threshold value is set to 8dB, when the
Measured Composite DL output power is 8dB less than the set Composite
Output Power, an alarm is generated.
• Meas. Composite DL Output Power – displays the currently measured
output signal level.
4. To configure each sub-band:
• Checkmark Enable. The configuration parameters in that row will be
available.
• In the Downlink area, set the Start and Stop DL Frequency (MHz). (The
Uplink Start and Stop frequencies will be automatically allocated.)
The defined BW will be displayed in the BW KHz column (to the left of the
Start Frequency).
Be sure to choose Start/Stop values displayed in the Band Info tab.
• Set the (Downlink) Max Gain as follows: by default, the MAX Gain (DL)
parameter is set to its highest level (90dB). Change the Channel Max
Gain (DL) according to the measured/calculated input power and isolation
measurements.
• The recommended Maximum Gain setting is approximately 12 dB less than
the isolation between the service and donor antennas.
5. If the site NOISE LEVEL is high enough to cause interference, adjust the noise level
as follows:
• Adjust the Gain Delta parameter – this sets the delta between the uplink
and downlink gain (so the uplink gain is relatively lower than the downlink
gain.
• Click Send.
• Repeat the procedure until the desired coverage is achieved.
6. More information on parameters for the selected sub-band:
• DL Set Ch. Max. Gain Sets the power for the antennas. The value is about
15 dB less than the isolation between the donor antenna and the mobile
antenna.
The Value defined in the DL path is reflected in the UL path, however to
define different UL and DL path values the Gain Delta parameter is used and
its defined value is added to the UL value.
• DL Measured RSSI - measured DL signal.
• DL Measured Ch. Gain - measured DL Gain (dB) for the selected sub-
band.
• DL Measured Ch. Power - measured Power (dBm) for the selected sub-
band.