Edgetech 2000-CSS, User Manual

Page: 60 / 101

4-8 4.0: TECHNICAL DESCRIPTION
2000-CSS COMBINED SONAR 0017423_REV_C
4.2 Towfish
A wiring diagram of the 2000-CSS towfish electronics is shown in F
IGURE
4-7 , and the electronics chassis is
shown in F
IGURE
4-6 . The electronics chassis contains all of the towfish circuit boards along with the
optional pressure sensor. The circuit boards are the following:
Power Distribution The Power Distribution board includes DC to DC converter
module which converts 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.
ADSL Modem The ADSL Modem board converts the downlink command ADSL
signals received from the 2000 Topside computer and input on J2
from the Power Distribution board into Ethernet
10/100/1000BaseT signals which are output on J1 to the CPU
board. Similarly, the ADSL Modem board converts the uplink
Ethernet 10/100/1000BaseT based data signals from the CPU
board into the ADSL uplink data signals which are output on J2 to
the Power Distribution board for transmission to the 2000
Topside computer. The ADSL Modem board also outputs the FSK
responder trigger signals on J5 to the Sonar Interface board and
to the optional Responder board. +12 and -12 VDC power is input
on J8 from the Power Distribution board.
Wet-End STARMUX III
The STARMUX III Wet-End electronics inputs the towfish 400 VDC
power on J1 from the 2000 Topside computer over the coaxial
tow cable and filters it from the frequency shift keyed (FSK)
responder trigger signals and the ADSL downlink command and
uplink data signals. The command signals are input and the data
signals are output on J9.