Service Manual

GSM-204-323
Overview of digital modules
31st Oct 01
Tech. 6–4
Technical Description: Horizon macro outdoor
CONTROLLED INTRODUCTION
68P02902W02-A
Digital module
and CTU
connections
The MCUF is connected to the CTUs in the same cabinet through the
backplane. Optional connection to CTUs in up to three additional cabinets (six
CTUs per cabinet) is by fibre optic links. FMUXs, two internal to the MCUF and
one half size module, convert the electronic data stream into a fibre optic signal.
An FMUX module in each extension cabinet converts the fibre optic signal back
to electronic data stream, for transmission to CTUs via the backplane.
The NIU modules convert signals for terrestrial E1 or T1 lines.
Diagram of
digital module
and CTU
connections
Figure 6-2 shows a block diagram of digital module and CTU connections,
without redundancy.
Figure 6-2 Digital module and CTU connections