Model 903 Multiplexer


Model 903 multiplexers provide highly reliable fiber optic transmission of video and data signals in demanding environments. A modular Eurocard design based around the FMB-X-2.5 fiber-optic motherboard and a wide range of supported video and data formats ensure the flexibility needed for easy system configuration. Individual data channels can be mixed and matched with a variety of plug-in interface modules. Advanced optical multiplexing (CWDM, DWDM) enables system expansion to 32 video and 256 data channels as well as additional high data rate signals such as HD-SDI, ECL for advanced sonars, and Gigabit Ethernet. Integrated diagnostics and software provide real time display and logging of all critical parameters.

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  • Compact, modular, 3U sub-rack
  • Highest quality digitized video
  • Wide range of supported video and data formats
  • Robust protection on I/O lines
  • Singlemode and multimode fiber options
  • Automatic fiber switching option
  • Extensive diagnostics monitors power system, video, data, temperature and fiber optic link


  • Easily reconfigured at card level and individual channel level
  • Diagnostics verifies health of umbilical and tether cables
  • Continually updated with the newest data formats, including HD-SDI, and Gigabit Ethernet, to provide an extended upgrade path (custom interfaces available)
  • Successful installation assured by factory acceptance tests at temperature extremes and 20 years of experience providing technical support for fiber optic systems

Typical Applications

  • Remotely Operated Vehicles (ROVs)
  • FPSO communications process control
  • Defense systems
  • Research ROV
  • Subsea mining


Model 903 Specifications
No. Slots 1 - 2 (3 - 8 optional with CWDM)
No. Channels 4 per slot (8 with switched video)
Format NTSC/PAL composite signals, RGB, Y/C (S-Video), YPrPb, HD-SDI optional
Digitization 10-bit
Bandwidth 6.0 MHz
SNR > 60 dB (62 dB typical)
Impedance 75 Ohms
No. Slots 2 - 4
Serial Data 4 - 16 channels per slot RS-232/485/422,
TTL (2.5 Mbps NRZ max)
Ethernet 3 ports, 10 Base-T (electrical)
3 ports, 100 Base-TX (optical)
1 port, 10/100 BaseT(X) (electrical on front panel of FMB)
4 ports, 1000 Base TX (optical)
ARCNET 1 - 4 Tritech ARCNET channels per slot
Hydrophone 1 - 4 channels per slot, 12bit, 16 Hz 28 kHz
Analog Sonar 1 - 4 bidirectional channels per slot MS900/971 compatible
Control Lines 10 bidirectional control lines per slot
Power Supply AC: 120/240 VAC (50/60 Hz)
DC: 24 VDC, 48 VDC
< 40 W each end typical
Isolation Varies with signal type (consult factory)
Optical Fiber 1 or 2 singlemode (9/125 µm)
1 or 2 multimode (50/125 µm and 62.5/125 µm)
Baud Rate FMB-X-2.5: 2.5 Gbaud, uplink and downlink
Wavelengths 1310/1550 nm standard (CWDM Optional, 1471-1611 nm)
Flux Budget > 20 dB (24 dB typical)
Chassis Eurocard 3U subracks (28 - 84 HP)
Rack width (mm) = 9.65 + (#HP x 5.08)
100 x 160 mm cards
Dimensions Height = 133 mm, Depth = 210 mm
Weight Remote 5.0 kg (11 lb), typical
Console 5.4 kg (12 lb), typical
Optical ST front panel bushing (FC optional)
Video SMB
Data 2 x 6-pin Wago, BNC, D-Sub, RJ45, SMB
Diagnostics DB-9S (Console FMB)
Temperature -10°C to +60°C (operational)
-20°C to +85°C (storage)
Humidity 85% RH, non-condensing
Vibration 5 g, 251000 Hz, 3 axes
Shock 30 g, 11 ms half sine, 3 axes


Technical Support

Telephone:  +1-902-468-2263