MacArtney Nexus MkIV Multiplexer

Available as:
  • Rental
  • Sale (ex rental)

MacArtney Nexus MkIV Multiplexer – Available for rental, hire and ex-rental purchase from Ashtead Technology.

The MacArtney NEXUS MK IV is replacing the successful NEXUS MK I, which has served the subsea ROV/ROTV market well for 6 years.. The MK IV is the 'Multibeam-Sonar Multiplexer' and does not interface video cameras. It is based on the MacArtney (P)ECL fibre optic converters, our Cypress multiplexer, MiniController and E2P ethernet converters. The new power switching of all the sensors is software controlled and combined with monitoring of sensor power status.

The subsea housing is made of 6082 hard anodised aluminium and the Subconn connectors are also the anodised aluminium type. If more than 3000 msw depth rating is required the pressure vessel will be produced in Titanium or high tensile Duplex steel. The fibre optic telemetry takes advantage of the CWDM (Course Wavelength Division Multiplexing) technology and communicates all signals over one singlemode optical fibre.

Key features

  • Interfaces all standard multibeam sonars and survey sensors
  • Operates on one singlemode optical fibre.
  • Supplies power to sensors. Software controlled


  • ROV/ROTV multiplexer for multibeam-sonar survey sensor setup

Technical specifications

Supply voltage85-265 VAC, 50/60 Hz
Power consumption25 W
VariousLight diodes for status indication
Dimensions podOD 197mm, total length including connectors app. 770mm
Depth rating3000 msw (standard)
MaterialHard anodised aluminium (standard)
Supply voltage85-132 & 180-264 VAC, 50/60 Hz
Output voltage24/12 VDC/others
Power switching12 x 24V & 7 x 12V
Multibeam-sonar signals2 (P) ECL, 125 Mb/s (Option: SeaBat 71xx interface)
RS 2325
RS 232/4852
Ethernet10/100 Base-T
Digital Channels16 I/O
Analog Channels8 input (12 bit), 2 output (12 bit)
LeakOccupies either 1 analog input or 1 digital input
Fibre optic
Fibre typeSinglemode 9/125
Number of fibres required1 or 2
Flux budget>26 dB


Topside unit dimensions19 rack mount1U high"
Subsea Unit50kg (in air), 26kg (in water)110lbs (in air), 57lbs (in water)