Cobham Wireless
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Coverage
BSF0060 User Handbook
www.cobham.com/wireless
Document number: BSF0060HBK
Issue number: 5
Date: 14/05/2018
Page 20 of 43
3.6.2.
Fibre Optic Transceiver Module
The Fibre Optic Transceiver Module provides Optical to RF signal conversion in the Downlink direction
and RF to Optical signal conversion in the Uplink direction. As downlink and uplink optical signals are
combined using WDM, only one fibre link is required. The Fibre Optic Transceiver Module in the
repeater works in parallel with a corresponding unit in an OMU at the master site which is linked via
the optical fibre connection (SC/APC port). A pilot tone can be sent between the Fibre Optic
Transceiver Module 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.
Caution! Class 1 Laser Product.
Un-terminated optical receptacles may emit laser radiation.
Do not stare into the beam or view with optical instruments.
On the Fibre Optic Transceiver Module there are six LED indicators; one for power status, one for
error, two for the data communication and two for the Optical signals.
LED 1, Power, Green
On
Unit is powered on
Off
Unit has no power
LED 2, Error, Red
On
Error detected
Off
No error
LED 3, UL Data, Yellow
On
Communication via the fibre optic module is ongoing in the uplink direction
Off
No communication
LED 4, DL Data, Yellow
On
Communication via the fibre optic module is ongoing in the downlink
direction
Off
No communication
LED 5, Optical RX, Green
On
Input fibre optic level OK
Off
Input fibre optic level below threshold
LED 6, Optical TX, Green
On
Output fibre optic level OK
Off
Output fibre optic level below threshold
