User's Manual

Intelibs, Inc. Proprietary and Confidential Page 8
8
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 850/1900MHz Dual-band and GPS
L1 band frequencies. It can be mounted on the wall or 19” rack. Variety of the donor antenna can be
used from Yagi directional antenna to high font-back-ratio directional antenna (or panel antenna).
Figure 2-1 RHU system
2.1 Network configuration
Three band RF signals such as 850/1900MHz and GPS L1 band from link and GPS antenna are fed to RHU
and RHU amplifies and converts into optical signal, and transmits this optical signals to remote RU
system. RHU can have up to 16 RUs and 5 FHU connections. RHU next release will support 700MHz,
2100MHz.
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
850/1900MHz band
1,310 nm
1,550 nm
GPS L1 band
1,550 nm
1,310 nm