User Manual

Table Of Contents
Optical Master Unit
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd A1829300 rev H 10 (86)
1 Repeater Technology
1.1 Basic Repeater Features
A basic feature of a mobile communication system is to transmit RF signals between base stations and mobile
radio equipment.
When there is a blocking object, such as a mountain or a building, preventing the base station signal to reach the
mobile equipment, a repeater can be used to extend the base station’s coverage area.
In the downlink path (from the base station to the mobile phone) the repeater picks up the signal in the air via a
donor antenna, amplifies it and re-transmits it into the desired coverage area via a server antenna. In the uplink
path (from the mobile phone to the base station) the repeater receives the signals from mobile transmitters in the
covered area and re-transmits them back to the base station.
Repeater
BTS
BTS
Donor antenna
Server antenna
Undisturbed transmission Obstacle creating a coverage hole
MS MS
A repeater can work off-air, as the repeater in the example above, or be fed over fibre from an optical master
unit, OMU. The OMU taps the signal directly off a base station via a coupler, converts it to light and transmits
it to a number of repeaters via fibre.
1.2 Software Overview
There are three types of software products; dedicated firmware for each Axell Wireless repeater or OMU,
Repeater Maintenance Console (RMC) and Axell Element Manager (AEM).
1.2.1 Firmware
The firmware is the software inside the Control Module of the repeater or OMU. It is command line based, with
simple SET and GET commands. A rich variety of commands is available to control and monitor all subsystems
of the repeater from a normal VT100 terminal emulation program, such as HyperTerminal™. This also means
that any standard laptop is able to control a repeater without additional software installed.
The firmware has three main tasks:
Set and configure parameters in the repeater, such as channel numbers, gain, power levels, and different
report configurations
Monitor and measure alarm sources, alarm parameters and repeater utilization
Send reports and alarms to the repeater OMC
Communication with the repeater or OMU can be performed either locally or remotely via a modem or
Ethernet.