User's Manual

Introduction to the MA 2000 System
System Architecture
MA 2000 Installation and Configuration Guide 4
1.1.4 System Operation
Figure 1-2 shows a basic block diagram of the system operation. On the downlink, the services
from the BTS/BDA are transferred via interface to the Base Units. The interface, which may be
passive (i.e. Interface Box) or active (RIU), is used to attenuate the RF signals to the required
levels, converge them and distribute them to the BUs.
The BUs are wideband – they are not
service specific.
At the BUs, the RF signals are converted to optical signals and transmitted over the optic fiber to
(service-specific) RUs at the remote locations. At the remote locations, the RUs, which are either
housed in an MA 2000 Cabinet or externally connected to an MA 2000 Lite, reconvert the optical
signal to RF. At the 2000 Cabinet/Lite, the services are converged and distributed over the coax
antenna infrastructure. Data services from 802.11/a/b/g APs may be integrated into the MA
2000 system at the remote locations. MA 410/430 provide monitoring and control of all active
system elements.
Figure 1-2. Basic Block Diagram of System Operation