Alvarion BreezeACCESS 900 System Manual page 54

Chapter 2 - Installation
3. Secure the GPS cable to the mounting pole, leaving a free length of
cable (with the 12-pin round connector at the end) sufficient for
connecting to the antenna module.
WARNING
The cable is very heavy and connecting it to the antenna without first securing it
to the pole may damage the connector.
4. Connect the 12-pin round connector to the GPS antenna.
5. Route the cable to the location intended for installation of the BS-
GU module.
Installing the BS-GU module
NOTE
When adding the BS-GU to an active base station, it is recommended to start by
reconfiguring the AU previously defined as Master to Slave, then immediately inserting
and configuring the Number of Hopping Frequencies parameter in the BS-GU module.
Otherwise both the Master AU and the BS-GU will send conflicting synchronization
signals to the Slave AUs. During this process, connectivity with the Subscriber Units will
be interrupted. It is recommended to perform the upgrade during a planned downtime or
at a time of minimal traffic. Properly configuring the value of the Number of Hopping
Frequencies parameter in the BS-GU is mandatory for proper operation of the base
station. All other parameters of the BS-GU module may be configured later as they do
not impact the operation of the system.
1. Carefully insert the BS-GU module into any of the free suitable slots
in the BS-SH chassis and push firmly until it is securely locked.
Close the captive screws attached to the module.
2. Connect the 9-pin micro D-Type connector of the GPS cable to the
SYNC IN connector (the top-left connector) of the BS-GU module.
WARNING
Deactivate the power to the BS-GU unit before connecting it to a GPS antenna.
Switch on the BS-GU only after the GPS antenna has been connected.
Daisy-chaining Two or More BS-GU Modules
If two or more BS-GU modules are installed in different collocated
BS-SH chassis, use a synchronization cable (supplied separately) to
connect the SYNC OUT connector of the first (Master) module to the
SYNC IN connector of the second module. The SYNC OUT of this second
module may be connected to the SYNC IN of a third module, and so on.
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BreezeACCESSS 900 System Manual