2-10 2.0 SPECIFICATIONS
4125 SIDE SCAN SONAR SYSTEM 0004823_REV_F
The main hardware elements in the 4125-P Portable and 4125 Rack Mount Topside Processors 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 towfish power, which is output on J5 to the Power Separation board, and
from this board to the towfish.
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.
NOTE: DC operation is for 4125-P portable topside only. The rackmount
does not have a DC power input.
VDSL Modem board. The VDSL Modem board converts the uplink data VDSL signals received from
the towfish 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 towfish power, and
transmitted to the towfish.
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 towfish, and the laptop computer to the same local area network (LAN).
This board also enables a wireless connection to the laptop computer.
NOTE: The 4125 Rack Mount Topside does not have a wireless bridge and
relies solely on ETHERNET to connect to the topside.
Power Separation board. 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 towfish power
from J5 of the Power board for transmission to the towfish.
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