Installation & Operation Manual Chapter 2

Chapter 2. Theory of Operation FibeAir 1500 Installation & Operation Manual
2-4 In Door Unit (IDU) Revision 2.0
2.2.3. Manager Module
The Manager module controls and manages all system’s modules, local
and remote units.
The Manager module also supports the user interface through Ethernet or
PPP/SLIP to the management station, and an ASCII terminal port. A local or
dumb terminal can be used for basic configuration and performance
monitoring.
Other features include:
n Log file.
n Remote software and firmware download (upgrades can be
downloaded from local to remote).
n Performance monitoring.
2.2.4. Cable Interfaces
A single coaxial cable connects the IDU to the ODU. This cable carries the
following signals:
n Transmit and receive modulated signals.
n Transmit and receive control data and communications between the
IDU manager and the ODU controller.
n DC power from the IDU to the ODU.
The system automatically issues an alarm if the cable is disconnected and
provides protection against shorts. Furthermore, there is no need to
measure and define the length and type of cable used since the system
automatically compensates cable parameters.
The following figure illustrates the signal direction through the coaxial cable.
-48 VDC
ODU TO IDU (CONTROL)
IDU TO ODU (CONTROL)
TX (PAYLOAD 155M)
RX (PAYLOAD 155M)
Figure 2-3 Signal Direction Through the Coaxial Cable