Radwin 5000 HPMP User Manual page 39

Hub Site Synchronization (HSS) Unit
Figure 3-13:
IDU-H Power connectors
The connectors are 3 pin in line female, with polarities (left to right) minus, ground, plus. To
avoid damage to the IDU-H, always use an AC/DC adapter supplied by RADWIN.
Hub Site Synchronization (HSS) Unit
The 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 the
HSS Unit. The HSS Unit is a compact, weatherproof (IP67) connector box that is installed on
the 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 a
protective cover.
Figure 3-14: HSS Interconnection Unit
See Chapter 10 for further details about the use of HSS.
RADWIN GSU
The GPS-based synchronization unit (GSU) is designed to handle inter-site interferences
under large-scale deployment scenarios.
The RADWIN GSU is an outdoor unit consisting of a standard WinLink 1000 enclosure, a GPS
antenna and a PoE device.
The RADWIN GSU is connected to the HSS Unit using a standard HSS cable. It synchronizes
the transmission timing of multiple Hub-Sites to the same clock source thus eliminating self
interference (see Chapter
RADWIN 5000 HPMP User Manual
11).
Release 3.3.30
Chapter 3
3-10