Operation Manual

Fiber Distributed Antenna System (Fiber DAS)
13
Interconnect Unit (ICU)
Interconnect units (ICU) are used to couple signals between the BIUs and the FOIs.
The functional purpose of the ICU is:
 Downlink - Split the signal from the BIU and route the balanced signals (minus insertion loss) to the FOIs.
 Uplink - Combine the signals from the FOIs and route the sum of the signals (minus insertion loss) to the
BIU.
The RF ports on the ICU are QMA.
Figure 8 Interconnect Unit Signal Flow
Base
Station
Base Station
Interface
Interconnect
Unit
Fiber-Optic
Interface Units
Fiber-Optic
Cables
to
Remote
Units
(Antenna)
Master Frame Unit
FOI
FOI
FOI
FOI
ICU
BIU
MFU ICU
The MFU ICUs are available in several different configurations to support a variety of system configurations.
These units are inserted into the MFU and provide signal routing to and from the BIUs and FOIs.
Figure 9 MFU ICU