Hub Site Synchronization (HSS) Unit Chapter 3RADWIN 5000 HPMP User Manual Release 3.2.00 3-6Outdoor (Ruggedized) DC PoE DeviceThis unit may be used or both the HBS and the HSUs. It will notsupport Gigabit performance on the HBS.Figure 3-7: Ruggedized DC-PoE Device: Input is -20 to -60 VDC (single input)Hub Site Synchronization (HSS) UnitThe HSS unit synchronizes collocated ODUs to prevent self interference. It is particularly use-ful at a multi-sector base station employing several HBSs.A single HSS unit supports up to ten collocated ODUs. In addition to each unit being con-nected to its PoE device, the collocated unit has an additional cable that is connected to theHSS Unit. The HSS Unit is a compact, weatherproof (IP67) connector box that is installed onthe same mast as the ODUs. All collocated units connect to this box using CAT-5e cable.Cables in prepared lengths are available for purchase.The HSS unit is supplied with ten protective covers; any port not in use must be closed with aprotective cover.Figure 3-8: HSS Interconnection UnitSee Chapter 9 for further details about the use of HSS.GSUThe GPS-based synchronization unit (GSU) is designed to handle inter-site interferencesunder large-scale deployment scenarios.The GSU is an outdoor unit consisting of a standard WinLink 1000 enclosure, a GPS antennaand a PoE device.
