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Appendix G
Hub Site Synchronization
When several units are collocated at a common hub site, interference may occur from one
unit to another. 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 frequencies, the physical spacing between radios, other interfering radios or
GE MDS Intrepid units are installed.
Note
 HSS does not eliminate the need for careful RF planning to ensure the design will work as
planned. See Chapter 2 for information on installation site survey.
The Hub Site Synchronization (HSS) method uses a cable connected 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 location receive.
Figure G-1 shows interference caused by non-synchronized collocated units.
Figure G-1. Interference Caused by Collocated Units
Adding HSS removes interference as shown in the next two figures:
Intrepid and Intrepid Ultra User Manual
Hardware Installation
G-1