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Optical Master Unit
Product Code - D35PB3VLM8
- Optical Master Unit OMU Fibre Optic System
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Further Reading:
Product Description
Optical Master Unit
Download PDF: Optical Master Unit
The Optical Master Unit (OMU) is used to convert signals from RF to light when fibre fed repeaters are used. The OMU is most often connected to a base station. In these cases, an RF coupler is used to couple off signals that are fed into the OMU. An entry shelf unit can also be used in cases when the base station and the OMU are not located close to each other. In the downlink direction, the OMU picks up the signal from the base station, converts it into an optical signal and transfers it over a fibre optical cable to the repeater. In the uplink direction the OMU receives the signal from the repeater via the fibre optical cable, converts it to a RF signal and sends it back to the base station.
Automatic Optical Gain Setting
The fibre option system Axell Wireless has designed puts a clear focus on user friendliness and ease of installation and commissioning. Through an automatic optical gain setting, the commissioning is easily performed, thus reducing the time it takes to put the equipment in service. This also means that the training is significantly simplified and the need for installation effort is decreased.
Reliability in Security Networks
TETRA is often used in security critical applications and Axell Wireless has therefore made reliability and redundancy a key element in its design of fibre optic systems. By using what is often referred to as a star typology, each remote unit has its own direct fibre connection to the OMU. One dedicated single fibre, carrying both UL and DL signals (WDM or Wavelength Division Multiplexing technology), is then used to serve each remote unit. Although it is preferable to use this type of configuration, a chain configuration where the signal in the DL is coupled off to several remote units is also possible to realise when there is a shortage of fibre.
Expandable Solution
Each OMU can be equipped with up to six optical modules and therefore support up to six remote units (BSF424). If additional repeaters are to be fed from the same base station, it is simple to expand the system with additional OMU units that in total will support up to 24 remote units.
Remote Supervision
Only one modem is needed to communicate with an OMU and its fibre fed repeaters. The modem types available are: GSM, PSTN, TCP/IP and even GSM-R. The modem is found inside the OMU and communication with the fibre fed remote units is transparently handled via the fibre that connects them. The system can be managed via the Axell Wireless Repeater supervision and remote control software tool, AEM (Axell Wireless Element Manager). All communication between the OMU and the repeaters - both data communication and the transferred RF signal - is managed over the same fibre link, which results in a very reliable supervision of the radio link.
The OMU supports TETRA, TETRAPOL, GSM-R, UMTS and GSM 900, 1800 and 1900 MHz frequency bands and is always used in combination with one or several fibre fed repeater(s).

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