User Manual

AXELL OPTICAL MASTER UNIT
PRODUCT DESCRIPTION AND USER’S MANUAL
2 © Axell Wireless Ltd
• Easily replaceable modules
• Simple, local setup via RS232 connection
• Remote management via Ethernet connection or via modem
• Various types of modems are supported: for example GSM, GSM-R, HSDPA/UMTS, TETRA,
GPRS and PSTN.
• Single modem (installed at the Master OMU) is required for management of cascaded OMUs
• Modem can be integrated (part of the Control module) or connected separately
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OMU is available in a range of models corresponding to repeater products
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The OMU can be installed in several configurations:
• Basic configuration of a single OMU installed at the BTS
• Expanding the system by either:
• Linking several OMUs (up to four)
• Using laser systems with three or four colors.
1.3.1 Single OMU Topology
The following figure illustrates the connections for a single OMU installed at the BTS. The OMU
supports up to six Repeaters, where each repeater is connected via optic fibre to an RF/Optic
converter module on the OMU. Each OMU supports up to six RF/Optic converters – for connections
to up to six Repeaters.
In the downlink the radio signal is tapped from a BTS using a coupler installed in series with the
BTS’s antenna cable. The Fiber Optic Converter in the OMU converts the RF signal to an optical
signal and sends it to the repeater over a fibre.
In the uplink the Fiber Optic Converter receives the optical RF signal from the repeater, converts it to
electrical RF signal and sends it to the BTS. The signal is transferred to the antenna cable using a
coupler.
Figure 2. Example of Single OMU Topology
BTS
Directional
Coupler
RF
OMU
Repeater
Opto Fiber
RF
FiberOptic
Converters
Server
Antenna
Up to six
Repeaters