Operation Manual

4
Chapter 2 System Description
The Fiber-DAS system typically consists of three main segments:
Gateway — The Gateway acts as a firewall ensuring internal traffic on the system remains internal and at the
same time allowing a web interface for monitoring and supervision. The gateway also handles SNMP traps.
Headend — The Headend serves as the interface with the operator’s base station, housing the units r
equired to
transmit and receive communications between the operator’s base station and the remote units of the Fiber-DAS
system.
Remote Units — the remote units are located near the distributed antennas and house the
equipment necessary
to transmit and receive communications between the antenna and the headend.
Figure 1
Remote
Unit
Remote
Unit
Remote
Unit
Head End
Gateway
Central
Gateway
Ethernet
Switch
Master
Frame
Unit
Master
Frame
Unit
Master
Frame
Unit
(BGW/RGW)
Fiber-DAS System
Gateways
The gateways offered include the Central Gateway (CGW), Base Station Gateway (BGW) and Remote Gateway
(RGW).
For remote supervision of a Fiber-DAS a gateway (RGW or BGW) is installed. BGWs and RGWs are typically located
with the headend equipment, the RGW is a smaller compact embedded solution while the BGW is a full featured
Linux server that can be set up in many different ways.
CGWs are used for monitoring multiple Fiber-DAS systems, communicating with the BGWs and RGWs.
Central Gateway (CGW)
The CGW is used to provide a single remote access point and to compile alarms from multiple BGW/RGW networks.
The unit is a self-powered Linux based server.
Base Station Gateway (BGW)
The BGW assigns IP addresses to all the modules in the Fiber-DAS system, including the Headend and Remote Units
as well as their components.
The BGW is a self-powered Linux based server.
Features of the BGW:
Web interface configuration
Automatic detection of modules
Automatic detection of Remote Units
Capable of handling large systems
Functions for statistics