Question
The permitted length of the bus cable within a line segment is between 1 000 m and 2 000 m, depending on the data-transmission rate.
Answer
False
False. The length rules of a TP line segment do not depend on the transmission rate, because KNX TP operates at a fixed 9 600 bit/s. The applicable rules are constants: 1 000 m total cable length per line segment, 350 m between any device and its power supply, and 700 m between any two devices. There is no 2 000 m option that you can unlock by changing a bit-rate parameter.
Preparation tip
Memorise the 1 000 / 700 / 350 m triplet — it comes up in nearly every exam batch and in nearly every real survey when sizing a complex line.
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