User's Manual

MRU Interfaces CMA-438-AEN Page 15
Draft
2 MRU Interfaces
This chapter provides detailed descriptions of the MRU chassis and main modules and interfaces. This includes port and LED
interface descriptions. The MRU comprises the following main modules:
•
Power amplifier modules (PAM) – internal service specific power amplifier module that interfaces to an optical interface
module (OIM) at the headend site via a single-mode fiber pair and supports one service. MRU supports up to seven bands.
The PAM provides the additional amplification on the DL signals routed from the OIM towards the multiplexer; PAMs are
pre-installed in designated slots according to supported band.
•
Multiplexer – combines the UL and DL RF signals of the supported services in addition to external RF signal (future option
for connecting to external 2.5 GHz signal source) while providing the proper filtering into a single duplexed antenna port.
•
Optical Module – includes the fiber optic, RF expansion and external alarm interfaces
•
Power supply module (PSM) - local AC or remote DC power feed (model dependent);
•
Fan module (FAM) – integrated fan module comprised of four fans which are also monitored via the web GUI
The MRU includes front panel interfaces (e.g. antenna, F/O connections and LED status indicators) as well as status indicators
per each internal module (which are accessed by opening the cabinet door. The following sections provide details on the front
panel and internal module interfaces.
Figure 2-1 MRU Main Modules