Trunk and drop line lengths
Suggested maximum lengths of trunklines and droplines
baud rate | max. trunk line length | max. drop line lenght | max. lenght of all drop lines | max. drop line lenght at multiport tap | max. lenght of trunklines with multiport tap (without droplines) |
50 kbit/s | 1000 m | 50 m | 250 m | - | - |
125 kbit/s | 500 m | 20 m | 100 m | 4,8 m | 310 m |
250 kbit/s | 250 m | 10 m | 50 m | 2,4 m | 120 m |
500 kbit/s | 100 m | 5 m | 25 m | 1,2 m | 66 m |
1 Mbit/s | 20 m | 1 m | 5 m | 0,3 m | 13 m |
CAN bus wiring test
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Suggested bit timing and bus length
Trunk and drop line lengths
More resources
Suggested bit timing and bus length
It is important for smooth operation of the components – especially when the maximum bus lengths are reached – to use exactly the same bit timing in all nodes.
The ten CAN commandments
By following the most important basic principles, you can ensure safe operation of even complex bus structures with sufficient interference reserves.
Why measure on physical layer ?
What gain in knowledge can you expect when you measure your CAN bus on the physical level ?


















