User's Manual

CrossFire – A revolution in RF Transport for In Building Wireless
User Manual
16 Revision 1.0.1
1. System Overview
1.1. Overview
The IDAS system includes the Access Unit (AU), Expansion Unit (EU) and Remote Unit (RU).
Using digital processing and digital optical transmission technology, the AU frames radio-frequency signals from base
stations of different operators, and of different standards and frequency bands, and transmits the composite signal to
the EU via optical fiber. WLAN and small cell base station signals access the gigabit/megabit Ethernet port on the EU and
are reframed with optical signals from the AU and then transmitted to the RU via optical fiber. The RU conducts
digital-analog conversion and power amplification of the input signals and then achieves radio coverage through the
antenna-feeder system for signals of all standards and frequency bands via 50Ohm coaxial cable.
1.2. Operating Fundamentals
Figure 1-1 shows the fundamentals of how the IDAS operates.
BTS
Fiber
AU EU RU
Fiber coaxial cable coaxial cable
ANT
Figure 1-1 IDAS Operating Fundamentals
WARNING: The design of the antenna installation needs to be implemented in such a way so as to ensure RF
radiation safety levels and non-environmental pollution during operation.
1.3. Technical Specifications
See the Technical Specifications Document for details.
1.4. System Framework
Figure 1-2 shows the typical IDAS system framework.