Transcript
MacArtney Underwater Technology
NEXUS MK E
Multiplexer for coax cabled applications Features and benefits
■■ Designed for use on existing copper cables ■■ Power switching individually controlled via software
■■ Power and data transferred on the same conductors
■■ Based on tried and tested MacArtney multiplexer technology and knowhow
■■ Easy upgrade path to fibre optic based telemetry ■■ Can be delivered as a portable multiplexer that can work with both fibre optic and copper cable systems
Applications
■■ ■■ ■■ ■■ The NEXUS MK E is designed as an electrical alternative to a fibre optic multiplexer. The MK E has been adapted to work with non-fibre optic cables and can be used to handle data on existing coax type side scan sonar and CTD cables as well as twisted pair cables.
Oceanography - CTD and LADCP ROV upgrade Towed vehicles Drop camera and towed camera systems
Options
■■ Control of up to 2 LED underwater lamps
(RS 485)
■■ Fibre interface ■■ Seabird SBE 9 plus interface
The MK E is intended for use in applications where there is a need to perform online communication with a number of underwater sensors and/or live video transmission. Power switching of the individually connected sensors, lights and camera is controlled through top side software. The system communicates with power and data on the same conductors along 6,000 metres of coax cable as standard or 3,000 metres on twisted pair cable. Coax cable length can be up to 10,000 metres as an option. The MK E multiplexer system includes a 19” 3U rack and subsea unit and a PC software package for setting up channels and power switching facilities (48, 24, 15 and 12 VDC). The system can also be supplied with 1 video channel and control of up to 2 underwater lights. The NEXUS MK E is designed to the same high standards as MacArtney’s fibre optic NEXUS multiplexers and is prepared with an upgrade path for subsequent upgrade to MacArtney’s fibre optic based telemetry system.
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2nd edition
www.macartney.com
NEXUS multiplexers
Specifications - topside unit Mechanical Dimensions:
Transport 19” rack mount, 3 U high
Delivered in Pelicase
Electrical Supply voltage: 110-230 VAC, 50/60 Hz Power consumption: 75 W Various: Light diodes for status indication
Specifications - subsea unit Mechanical
Video 3,000 m OD 136 mm, total length including connectors approx. 750 mm Hard anodised aluminium (7075 T6 standard) 14 kg 7 kg
Depth rating: Dimensions pod: Material: Weight in air: Weight in water:
6,000 m OD 164 mm, total length including connectors approx. 770 mm Hard anodised aluminium (6082 T6 standard) 22 kg 9 kg
Multiplexer 8 serial channels, full duplex, max 115.2 KBaud (see below) RS 232: 6 RS 485: 1 RS 422: 1 Ethernet: 1 x (low bandwidth)
PAL or NTSC: Control of LED lamp:
1 x (up to 704 x 576 px) 2
Data Acquisition
Depth rating: Dimensions pod: Material: Weight in air: Weight in water:
Electrical Supply voltage: Output voltage:
375 VDC (range 250-425 VDC) 48V/150 W 24V/150 W 12V/150 W Software controlled power switching
Cable Cable type: Option: Power/data:
Coaxial (6,000 m) or twisted pair (3,000 m) Up to 10,000 m depending on cable type Combined power and data on same conductors
Transport Delivered in flightcase
Serial baud rate can be configured to customer requirements up to max 115.2 KBaud
2nd edition
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