Question
What characterises an internal line telegram?
Answer
C — Sender and destination devices are on the same line, so the telegram is not routed to another line.
Correct: For an internal line telegram both devices belong to the same line, so the line coupler has no reason to forward it.
Source
KNX Basic Course Documentation — 3.11 — p. 75
All proposed choices (exam context)
- A.It is always forwarded onto the main line by the line coupler.
- B.It is a telegram sent with routing counter 7 by a service device.
- C.Sender and destination devices are on the same line, so the telegram is not routed to another line.✓
- D.It travels via the backbone line to reach devices in other areas.
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