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1.4 4125 Rack Mount Topside
The 4125 system can also be ordered with a 19” 2U rack mount option instead of the portable topside.
This version of the processor is intended for permanent mounting in a sheltered section of the survey
vessel.
This system configuration includes towfish and DC power supplies, ADSL modem, and an Ethernet switch,
all within a single 19-inch 2U rack. The rack mount option interfaces with a user supplied computer over
a 10/100BaseT Ethernet connection. The Ethernet cord is included.
1.5 Towfish
The 4125 Towfish is available with a choice of 400/900 kHz or 600/1600 kHz operating frequencies. It
contains the sonar transducer arrays and the electronics required to transmit and receive the sonar
signals; to receive the downlink commands from the topside processor; and to provide the uplink side
scan data, sensor data, and status information to the topside processor.
The electronics are contained inside a single, lightweight stainless steel, 200-meter depth-rated housing,
comprising the aft section of the towfish. The forward section is flooded and includes both the port and
starboard transducer arrays. A single O-ring sealed end cap is attached to each end of the housing to seal
it, and the forward end cap contains bulkhead connectors for connecting to the transducer arrays. An
adapter cable for power and communication also connects to this end cap.
The cable snakes through a hole in the transducer array section and includes an inline connector for
connecting to the tow cable. The towfish interfaces with the topside over a 10BaseT connection that uses
VDSL modems in both the towfish and the topside processor.
The towfish is also equipped a stainless steel nose for hydrodynamic balance and two convenient carrying
handles. A towing arm is rigidly mounted to a tow point on the top of the towfish housing adjacent to the
tow cable connector. The tow cable attaches to a shackle on the towing arm.
Additional mounting holes are provided on the tow point should it be necessary to reposition the towing
arm forward or aft to adjust the balance of the towfish. The towing arm also includes a safety release
mechanism, which causes a shear pin to release the tow point should the towfish hit an obstruction or
become snagged. If this happens, the towfish will rotate nose down, and a safety cable, which is attached
from the tow point to the rear of the towfish, will pull the towfish over the obstruction or through the
snag, stern first.
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