Installation Manual

Chapter 1 - System Description The Base Transceiver Station (BTS)
BreezeMAX Extreme 20 System Manual
In cases where the operator prefers other antenna vendors, Alvarion can provide a
recommended antenna specification based on the required antennas types.
For more information on recommended antenna configurations and required
antennas refer to “Antenna Configurations” on page 835.
1.3.2 GPS
GPS is used to synchronize the air link frames of Intra-site and Inter-site located
Base Transceiver Stations to ensure that in all Base Stations the air frame will
start at the same time, and that all Base Stations will switch from transmit
(downlink) to receive (uplink) at the same time. This synchronization is necessary
to prevent Intra-site and Inter-site interference and Base stations saturation
(assuming that all Base Stations are operating with the same frame size and with
the same DL/UL ratio).
In order for the system to be synchronized, the GPS have to first acquire at least 4
satellites. After that the GPS reception can be reduced to 1 satellite.If no satellite
is received the BTS will go to holdover state where internal clock is provided to
synchronize the BTS.
Table 1-2: BTS Antennas
Product Description
BS ANT 65/3.X DP Antenna 3.3-3.8GHz, 65° sector Dual polarization,
Terminating Connector: N female
BS ANT 90/3.X DP Antenna 3.3-3.8GHz, 90° sector Dual polarization,
Terminating Connector: N female
BS ANT 60V/3.3-3.8 Antenna 3.3-3.8 GHz, 60° sector vertical polarity,
Terminating Connector: N female, Total gain 16.5 dBi.
BS ANT 90V/3.3-3.8 Antenna 3.3-3.8 GHz, 90° sector vertical polarity,
Terminating Connector: N female, Total gain 15 dBi. .
Omni ANT 3.4-3.6 Omni antenna 3.4-3.6 Ghz, Terminating connector: N
female, Total gain: 10 dBi.