1604   worst-case forwarding delay calculation wrong

Created: 16 Nov 2017

Status: Ballot Period

Part: Part 90-4 (2013; Edition 1)

Links:

Page: page 69

Clause: 7.3.1.2.3

Paragraph: 5th paragraph

Category: Issue for edition 2 of this part

Issue

if every node introduces a worst-case forwarding delay of 123 µs, putting 50 nodes in series, worst-case forwarding delay is 123*50 = 6150 µs, not 6159 ms.

Proposal

Discussion Created Status
This is an approximation. The correct value is not exactly 123 us, it is for the longest PRP frame 123,36 us (6,168 ms), but without PRP it is 122,8 (6,144 ms). Let's put 6,168 ms. 19 Jan 18 Ballot Period
Will be considered in edition 2 of TR90-4, what is already in process. 16 Nov 17 Discussion (red)

 

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