User's Manual
Intelibs, Inc. Proprietary and Confidential Page 6
6
1 Introduction
Radio Hub Unit (RHU) is a part of the Hybrid Distributed Antenna Systems (HDAS) to provide RF link
solution between RF Source and Remote Unit (RU). This RHU receives RF signal over-the-air or wire line
and this unit filters, amplifies and converts RF signal into optic signal and transmits to child unit such as
FHU and RU through single mode fiber. RHU is built on a small form factor with six antenna ports for
700MHz, 850MHz, 1900MHz, AWS band and two GPS antenna ports with the following features
Support for a multi frequency band, multi-technology and multi-carrier
Wide band sub-channel selection by digital filter
Antenna isolation detection and oscillation protection function
Low Power consumption that can be operated by PoE or small AC/DC converter
20dBm Up Link composite power per band
SNMP based remote management support
Provide signal to remote unit(RU) site as far as 10Km distance that has 5dBo loss via single mode
fiber
Optic fiber sharing between different carriers
AGC (Auto Gain Control), ALC(Auto Level Limit Control), IGC(Gain Control due to lack of antenna
Isolation and ASD(Auto Shut Down) function
Compact and high capacity with scalable design
Ruggedized enclosure with more outdoor temperature compliance
GPS port redundancy function in order to switchover when other GPS fails
Hybrid DAS RHU is comprised of the following subsystems:
FHU (Fiber Hub Unit): Interface unit between RHU and Remote Units, Convert O/E, compensate loss
and convert E/O. this unit has optic input port and optic output port.
SRU (Small power Remote Unit): Small power (23dBm per band) remote unit for indoor
MRU(Medium power Remote Unit): Medium power(33dBm per band) remote unit for indoor
HRU(High power Remote Unit): High power(37 ~ 43dBm per band) remote unit for outdoor
MU (Master Unit): Element management server
As illustrated in Figure 2-2, Hybrid DAS network is comprised of RHU, FHU and SRU/MRU/HRU. RHU and
xRUs can transmit signal to coverage area. An optic cable can be shared between different carriers and
different band.