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070-20000340-01 Rev A
Connecting an External Reference Clock
For timing, a Base Station Unit can use its own internal oscillator, or a 10 MHz signal
from an external source. When multiple BSUs are colocated, it is a good idea to use
an external source to facilitate synchronization.
To connect an external source:
1.
If it is not already present, install the reference source per the manufacturer’s
instructions.
2.
Construct a coaxial cable with a the required connector for the reference source
at one end, a BNC T-connector for each BSU, and a 50-ohm termination at the
other end.
3.
Connect the cable to the reference source and to the
Ext Ref
connector on each
BSU, as shown in
Figure4-5
.
Figure4-5
Connecting an External Reference Clock
Coaxial Cable with
BNC Connectors
10 MHz Reference
T connector
T connector
T connector
Connects
Ext Ref
on all BSUs to
10 MHz reference clock
50-ohm termination
