User Manual

MBF, Multi Band Repeater
PRODUCT DESCRIPTION AND USER'S MANUAL
© Axell Wireless Ltd A 200 93 00, rev E 32 (105)
3.8 OMU-Repeater System
An OMU-Repeater system consists of one or more Optical Master Units and one or several fibre fed
repeaters.
An Optical Master Unit, OMU, can be equipped with up to 6 fibre optic converters. If more than 6 repeaters
are needed in the network there are two ways of expanding the system.
 Link several OMUs together.
Up to 4 OMUs can be cascaded in this manner, and operate up to 24 repeaters as one system. When
OMUs are cascaded only one is equipped with a Control Module and that one manages the other OMUs
as well as all the repeaters.
BTS
RepeatersOMU Units
Four OMUs cascaded in one system
 A laser system with two colors can operate one repeater for each fibre optic converter in an OMU-
Repeater system; one color is used for the uplink and one for the downlink. A laser system with three or
four colors can operate two or three repeaters per fibre optic converter. One color is used for the
downlink which is the same for all repeaters, and in the uplink each repeater uses its own color.
The connection from one repeater to the next is done via so called add-drop couplers. If needed these
couplers can be designed to balance the downlink signal to compensate for different distances to the
repeaters.
Add-drop
Coupler
Slave 1
Slave 2
OMU
1310
1550
1510
Two repeaters are connected to the same converter in the OMU via the same fibre but the wavelength for the
uplink differs between the units. Slave 1: 1550 ± 3 nm, Slave 2: 1510 ± 3 nm. The downlink signal is the same
for both repeaters.