Optical transmission Unit For Can FD and Flexray™

The CW-131FD Optical Transmission Unit provides bidirectional optical transmission of automotive network data over distances - up to 500 m. Overall, it is possible to connect 4 CAN FD/HS (flexible datarate/highspeed), 2 CAN LS (lowspeed) and 4 FlexRay™ (channel A and B) buses. 

Hereby, CW-131FD operates as an active CAN node to guarantee proper transmission, even when used outside specified cable length restrictions. CAN-bus settings can be configured by a webbased configuration software, accessed easily via ethernet connection. FlexRay™ transmission starts up instantly and ensures deterministic timing - plug-n-play.

All bus data is transmitted via a fiber optic cable (FOC), comprising 4 fibers. Due optical transmission best galvanic isolation and noise immunity is provided for connected devices.

CW-131FD system runs stand-alone and consists of two identical TX/RX units interconnected via fiber optic cable. It is primarily designed to exchange data between two distant located test bench systems - e.g. hardware-in-the-loop simulator systems. Therefore, CW-131FD features a 19” rack housing ideal for most test bench applications. Moreover, it is well suited for testing purposes in an EMC chamber, too. 


  • Bidirectional, optical transmission of 4 FlexRay™, 4 CAN FD/HS and 2 CAN LS bus data 
  • Transmission distance of up to 500 m (depending on FOC damping, cable length and bus system) 
  • Best galvanic isolation and noise immunity due optical transmission 
  • Transmission of FlexRay™ with deterministic timing 
  • Plug-n-play operation of FlexRay™ busses 
  • Intelligent operation as active CAN- node ensures long distance transmission 
  • Webbased con guration software for CAN bus settings 


Technical Data

Optical Transmission

Wave length: 850 nm
Laser: Class 1, eye-safe, hot-pluggable
Fibre optic cable: 4 fibers, (Type: OM3)
FOC propagation time: approx. 5 ns per meter
Connector: LC
Transmission bandwidth: 1,2 GHz


Number: 4
Type: Channel A and B, system startup support of FlexRay™-network
Data rate: 10 Mbit/s
Termination: -
Propagation delay: 300 ns typ. (without FOC) 
Connector: 9 pin. D-Sub connector per port


Number: 6
Type: 4 CAN FD ISO 11898-2:2015 (Flexible Datarate; Downward compatible to CAN HS) 2 CAN ISO 11898-3 (Lowspeed)
CAN-protocol version 2.0 A and 2.0 B, supports SAE J1939 (29-Bit-identifier) 
Data rate: CAN FD: Up to 8 Mbit/s; CAN LS: up to 125 kbit/s 
Termination: -
Propagation delay (without FOC): 150 μs 
Connector: D-Sub 9 pin. connector per port

Power supply

Supply voltage: 100 VAC to 240 VAC
Power consumption: max. 1 A at 100 VAC

Environmental Conditions

Temperature range operation: -20 °C to +70 °C
Temperature range storage: -20 °C to +85 °C
Relative humidity: 35 % to 85 %, non condensing
Protection class: IP40

General information

Housing: 19" rack-aluminium-housing, 2 U, further housings on request
Weight: 3,9 kg
Scope of service:
  • Bidirectional transmission of FlexRay™, CAN FD, CAN HS and CAN LS
  • Transmission distance up to 500 m
  • Galvanically seperation through optical transmission 
  • Plug-n-play FlexRay™ operation, no configuration required
  • Webbased intuitive con guration software for CAN FD and CAN LS settings 


Datasheet CW-131FD

Download (PDF)

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