RADWIN 5000 HPMP User Manual Release 3.2.00 9-1Chapter 9Hub Site SynchronizationScope of this ChapterThis chapter is specific to collocating HBSs. Should you require to collocate with other radiomodels, you should consult with RADWIN Customer Service.What is Hub Site Synchronization?When several units are collocated at a common hub site, interference may occur from oneunit to another. RADWIN ODU units support the collocation of more than two units at a cen-tral site. Like any other RF deployment, the wireless operation is highly dependent on factorssuch as available frequencies, the physical spacing between radios, other interfering radios,and whether WinLink 1000, RADWIN 2000 or RADWIN 5000 HPMP units are installed.The RADWIN Hub Site Synchronization (HSS) method uses a cable connected from the mas-ter ODU to all collocated ODUs; this cable carries pulses sent to each ODU, which synchronizetheir transmission with each other. The pulse synchronization ensures that transmissionoccurs at the same time for all collocated units. This also results in all of the hub site unitsreceiving data at the same time, eliminating the possibility of interference that could result ifsome units transmit while other units at the same location receive.Figure 9-1 illustrates interference caused by non-synchronized collocated units.NoteHSS does not eliminate the need for careful RF planning to ensure thedesign will work as planned. See Chapter 2 for information on installationsite survey.
