User's Manual

Intelibs, Inc. Proprietary and Confidential Page 9
9
2 Product Description
Radio Hub Unit (RHU) is a part of the Distributed Antenna System (DAS) to provide link between RF
Source and DAS RU, to fill coverage gaps and to enhance the quality of service of extending coverage of
mobile service.
As shown in Figure 2-1, RHU is a compact platform with the natural heat convection. As unified form
factor, RHU services multiple technologies on a single platform with 700/850/1900/2100MHz
Quadruple-band and GPS L1 band frequencies reception. It can be mounted on the wall or 19” rack.
Variety of the donor antenna can be used from Yagi directional antenna to high F/B Ratio directional
antenna (or panel antenna).
Figure 2-1 RHU system
2.1 Network configuration
Four band RF signals such as 700/850/1900/2100MHz or 2 GPS L1 band from link and GPS antenna are
fed to RHU and RHU amplifies these RF signals and converts into optical signal, and transmits this optical
signals to child unit likes FHU or xRU. RHU can have up to 16 RUs and 5 FHU connections.
A fiber optic cable can be shared between different carriers or different band. Each frequency band
signals are combined to one wavelengths in a single fiber. Table 2-1 describes those wavelength
assignments. Maximum allowed optic loss between RHU and RU system is 10 dBo.
Table 2-1 Optic wavelength of each frequency band
Frequency band
Downlink Wavelength
Uplink Wavelength
700/850/1900/2100MHz band
1,310 nm
1,550 nm
GPS L1 band
1,550 nm
1,310 nm