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4125 SIDE SCAN SONAR SYSTEM 0004823_REV_C
The main hardware elements in the 4125-P Portable Topside Processor include the following components
and circuit boards:
Power board. The Power board inputs +24 VDC on J2 from the 24 VDC Power Supply and
generates the 75 VDC tow vehicle power, which is output on J5 to the Power Separation board,
and from this board to the tow vehicle.
The Power board also includes +5, +12, and +15 VDC power supplies. The +5 VDC is output on J3
to the Wireless Bridge/ETHERNET Switch board, and the +12 VDC is output on J6 and J8 to the
VDSL Modem board and the fans, respectively. For DC operation, 12–24 VDC is input on J1.
VDSL Modem board. The VDSL Modem board, which is used only with the additional telemetry
option, converts the uplink data VDSL signals received from the tow vehicle and input on P4 from
J3 of the Power Separation board into ETHERNET 10/100BaseT signals. These signals are then
output on P2 to the Wireless Bridge/ETHERNET Switch board, and from J1 of this board to the
laptop computer.
Similarly, the VDSL Modem board converts the downlink ETHERNET 10/100BaseT based command
signals from the laptop computer into the VDSL downlink command signals, which are then output
on P4 to J3 of the Power Separation board to be combined with 75 VDC tow vehicle power, and
transmitted to the tow vehicle.
24 VDC Power Supply. The 24 VDC Power Supply inputs AC power from the AC Line Filter to
generate +24 VDC, which is output to the Power board.
AC Line Filter. The AC Line Filter filters the AC power input and outputs the filtered power to the
24 VDC Power Supply.
Wireless Bridge/ETHERNET Switch. The Wireless Bridge/ETHERNET Switch board connects the
VDSL Modem board, the tow vehicle, and the laptop computer to the same local area network
(LAN). This board also enables a wireless connection to the laptop computer.
Power Separation board. With the additional telemetry option only, the Power Separation board
combines downlink command signals and uplink data that are input on J3 from P4 of the VDSL
Modem board with 75 VDC tow vehicle power from J5 of the Power board for transmission to the
tow vehicle.
If the additional telemetry option is not included, the Power Separation board is used only to
route the 75 VDC tow vehicle power to the tow vehicle Commands and data are sent and received,
respectively, over a direct ETHERNET connection to the tow vehicle.
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The specifications for the 4125 Tow Vehicle are shown below:
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