User Manual

Table Of Contents
Optical Master Unit
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd A1829300 rev H 17 (86)
2.2.1 Fibre Optic Converter
The Fibre Optic Converters are placed in slots 1, 2, 3 and 6, 7, 8.
A Fibre Optic Converter translates back and forth between RF and optical signals. The optical signals are
analogue. Each module contains both an optical receiver and a transmitter. The optical signals for downlink and
uplink are combined utilizing WDM technology (Wavelength Division Multiplexing). Hence only one fibre is
necessary for the transmission to and from the repeater.
Each Fibre Optic Converter in the OMU works in parallel with a corresponding unit in the repeater which is
linked via the fiber. A pilot tone can be sent between the Fibre Optic Converters in the OMU and the repeater to
define the loss in the fibre. Based on this information the repeater automatically adjusts the attenuation to
compensate for the fibre loss.
On the Fibre Optic Converter module there are six LED indicators; one for power status, one for error, two for
the data communication and two for the RF signals.
ERR
PWR
UL
DATA
DL
DATA
OPTO
Rx
OPTO
Tx
SC/APC
PWR Indicates that the power is on
ERR Indicates that there is something wrong in the module
UL DATA Ongoing communication in the uplink direction
DL DATA Ongoing communication in the downlink direction
OPTO Rx Received signal on fiber channel
OPTO Tx Transmitted signal on fiber channel
Fiber link connection
UL DATA and DL DATA reflect the ongoing data communication
OPTO Rx reflects received RF signal
OPTO Tx reflects transmitted RF signal
The fibre connector is SC/APC. The connector house is SC, the connector type is APC.
Note!
Angled connectors, APC, need to be used throughout the whole link between
the OMU and the repeater. The angle needs to be 8 degrees.
Also the ODF connections need to be APC type.
The fibre must be monomode type.
Caution
Un-terminated optical receptacles may
emit laser radiation. Do not stare into beam
or view with optical instruments.