User's Manual

Chapter 4 - Operation and Administration
BreezeACCESSS VL System Manual
4-54
Antenna Gain
The Antenna Gain parameter enables to define the net gain of a
detached antenna. The configured gain should take into account the
attenuation of the cable connecting the antenna to the unit. The
Antenna Gain is important especially in countries where there is a limit
on the EIRP allowed for the unit; the maximum allowed value for the
Transmit Power parameters cannot exceed the value of (EIRP- Antenna
Gain), where the EIRP is defined in the selected Sub Band.
In certain units with an integral antenna the Antenna Gain is not
available as a configurable parameter. However, it is available as a read-
only parameter in the applicable “Show” menus.
The range is 0 – 50 (dB). A value of “Don’t Care” means that the actual
value is not important. A value of “Not Set Yet” means that the unit will
not transmit until the actual value (in the range 0 to 50) is configured.
The unit can be configured to “Don’t Care” or “Not Set Yet” only in
factory (when upgraded to SW version 2.0 from a lower version it will be
set automatically to one of these options). Once a value is configured, it
is not possible to reconfigure the unit to either “Don’t Care” or “Not Set
Yet”.
The default value depends on unit type. In SUs with integral antenna it
is set to 21 (read only). The default value for AUs that are supplied with
a detached antenna is in accordance with the antenna’s gain. In units
supplied without an antenna the default is typically “Not Set Yet”.
Cell Distance Parameters (AU only)
The higher the distance of an SU from the AU that is serving it, the
higher the time it takes for messages sent by one of them to reach the
other. To ensure appropriate services to all SUs regardless of their
distance from the AU while maintaining a high overall performance
level, two parameters should be adapted to the distances of SUs from
the serving AU:
! The time that a unit waits for a response message before
retransmission (acknowledge time delay) should take into account
the round trip propagation delay of the farthest SU. (the one-way
propagation delay at 5 GHz is 3.3 microsecond/km). The higher the
distance from the AU of the farthest SU served by it, the higher
should be the acknowledge time delay for all units in the cell.