OPTICAL MASTER UNIT MARK I
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless
Document number: A1829300UM Rev. 3.1
Page | 1
1 INTRODUCTION
The Cobham Wireless OMU is a scalable, RF to optic signal conversion unit. The unit is installed near
the Base Station and is used in combination with fibre fed repeaters to provide wireless coverage for
remote sites located at a distance of up to 20 km (12.42 miles) from the Base Station.
The OMU taps the signal directly off a base station via a coupler and performs the RF to optic
conversion of the base station signal for transmission to the fibre connected repeaters. (In the
uplink, the procedure is reversed).
The OMU can either be installed at the BS or connected directly to a repeater. In that case the signal
is tapped from the repeater’s service antenna.
An OMU can be equipped to be used for frequency ranges from 88 MHz to 2170 MHz.
A single OMU unit supports up to 6 fibre optic converters, where each converter provides the signal
conversion for one Repeater. The system can be expanded to support up to 24 Repeaters.
The figure below illustrates an OMU system with six F/O converters and two power supplies.
Figure 1-1. Example of OMU System
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