FA4800 User Manual
Release 1.9.30
10-1
Chapter 10
Hub Site Synchronization
What is Hub Site Synchronization?
When several units are collocated at a common hub site, interference may
occur from one unit to another. Ceragon ODU units support the collocation
of more than two units at a central site. Like any other RF deployment, the
wireless operation is highly dependent on factors such as available frequen-
cies, the physical spacing between radios, other interfering radios, and
whether FA4800 or FibeAir 2000 units are installed.
The Ceragon Hub Site Synchronization (HSS) method uses a cable con-
nected from the master ODU to all collocated ODUs; this cable carries
pulses sent to each ODU, which synchronize their transmission with each
other. The pulse synchronization ensures that transmission occurs at the
same time for all collocated units. This also results in all of the hub site units
receiving data at the same time, eliminating the possibility of interference
that could result if some units transmit while other units at the same loca-
tion receive.
Figure 10-1
illustrates interference caused by non-synchronized collocated
units.
Note
HSS does not eliminate the need for careful RF planning to ensure the
design will work as planned. See Chapter 2 of the User Manual (both
FA4800 and FibeAir 2000) for information on installation site survey.
For FA4800 units, Hub Site Synchronization support depends on the product
model.
