Kongsberg EM 2040C, Maintenance Manual

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Processing Unit overview
The Processing Unit is the central controlling device in the EM multibeam system. It is
provided to process the signals to and from the sonar head(s).
It is an industrial computer which is designed and
tested for rugged use.
The Processing Unit also supplies 48 Vdc power to
the sonar head(s).
One or two Processing Units may be required, depending on the system configuration.
Processing Unit familiarization
The Processing Unit consists of an instrument case with integrated rack mounting in a
19 inch rack.
It uses both COTS (commercial off-the-shelf) components and custom made
components. Ventilation is provided through slits located on the sides. The front panel of
the Processing Unit holds a mains power switch and an information display.
The Processing Unit can be switched on/off with a remote switch.
The sonar head(s) are connected to the Ethernet switch in the Processing Unit.
The receive data from the Gbit link is filtered and beamformed by an FPGA unit on the
CBMF board. The result is transferred to the CPU board via the cPCI backplane.
Simplified block diagram
(CD029501_001_001)
Operator
station
External
sensors
CPU
Ethernet
switch
CBMF
External
sync
1PPS
RX
transducer
TX
transducer
EM 2040C