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The circuit boards for the 4200 Series tow vehicle include the following:
2.2.1 Power Distribution
The Power Distribution board inputs the tow vehicle 400 VDC power on J1 from the topside processor
over the coaxial tow cable. It filters the tow vehicle power from the frequency shift keyed (FSK) responder
trigger, ADSL downlink command, and uplink data signals. The command signals are input, and the data
signals are output on J2.
The Power Distribution board also includes DC to DC converters, which convert the 400 VDC to +48, +12,
12, and -5 VDC. The +48 VDC is output on J4 to the Amplifier boards. The other voltages are output on J6
to the ADSL Modem board, J5 to the CPU board, J7 to the Sonar Interface board, J8 to the Option
connector, and J9 and J11 to the fans.
2.2.2 ADSL Modem
The ADSL Modem board converts the downlink command ADSL signals that it receives from the topside
processor via J2 from the Power Distribution board into Ethernet 10/100BaseT signals. These signals are
then output on J1 to the CPU board. Similarly, the ADSL Modem board converts the uplink Ethernet
10/100BaseT-based data signals from the CPU board into the ADSL uplink data signals. These signals are
output on J2 to the Power Distribution board for transmission to the topside processor. The ADSL Modem
board also outputs the FSK responder trigger signals on J5 to the Sonar Interface board and the optional
Responder board. +12 and -12 VDC power is input on J8 from the Power Distribution board.
2.2.3 T/R Switch
The T/R Switchboard provides the transmit/receive function for the side scan transducer arrays, allowing
them to be used both as acoustic transmitters and as acoustic receivers simultaneously. Transmit signals
are input from the Power Amplifier board as follows:
• J1: Port low frequency transmit
• J2: Port high frequency transmit
• J3: Starboard high frequency transmit
• J4: Starboard low frequency transmit
Amplified transmit signals are output to the transducer arrays or received signals are input from the
transducer arrays as follows:
• J5: Port transducer array transmits (forward)
• J8: Port transducer array receive (aft)
• J13: Starboard transducer array transmit (forward)
• J14: Port transducer array receive (aft)
The T/R Switchboard also includes four noise-reducing receiver preamplifiers, one for each of the high
and low-frequency port transducer arrays, and one for each of the high and low-frequency starboard
transducer arrays.
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