User Manual

User Reference and Installation Manual 2-10
MDS 5800 II
2.5 System Description
The overall digital radio architecture consists of a single 1RU rack mount Software Defined Indoor
Unit
TM
(SDIDU
TM
) with a cable connecting to an Outdoor Unit (ODU) with an external antenna.
The ODU is available with an integrated antenna or connectors to support an external antenna.
Two ODU types are available servicing the 5.8 GHz band or the 5.3 GHz band. This SDIDU
TM
/ODU architecture is advantageous when compared to a single IDU with external mount antenna
since supporting a signal of 5.8 GHz from the IDU rack to the antenna will result in significant
signal degradation, which would require expensive coaxial cable or waveguide.
Figure 2-4 shows the SDIDU
TM
and interfaces from a functional point of view. The functional
partitions for the I/O, Modem/IF, and power supply modules are shown. The SDIDU
TM
comes
with the standard I/O capability that can be upgraded. In addition, the Modem/IF function is
modular. This allows the addition of a second Modem to support protection or ring architectures.
The power supply is similarly modular.