1-8 CHAPTER 1 Overview
Series 3000 Sonar System Operations and Maintenance Manual 11210066, Rev. 11
Multiplexer board.
The Multiplexer board digitizes the signals from each of
the transducer sub-array channels along with the signals from the sensors,
encodes the data, and transmits a high baud rate digital data stream to the TPU
via the tow cable. The Multiplexer board also receives the trigger signal and
command messages which instruct the Transmitter board to fire the arrays and
configure aspects of towfish operation. The Multiplexer board also acts as a
motherboard for the other boards providing the connections and distributing
power.
A full duplex hybrid allows data transmission up the cable while
simultaneously receiving the FSK trigger signals and power. The downlink
signals are input to FSK demodulators, and the baseband outputs are routed to
the Transmitter board, indicating when to fire the main array, and to a micro
controller that handles towfish configuration.
Towfish connector. The towfish connector pinouts are shown in Table 1-1,
and the connector is shown in Figure 1-4. Only two pins are used.
Table 1-1: Towfish Connector—at Towfish
PIN NO. LABEL FUNCTION
1
Power/Data +200 VDC power and multiplexed data
2 Shield Power and data return
Figure 1-4: Towfish Connector—at Towfish
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