Re: [6lo] Call for feedback to draft-wachter-6lo-can-00

Alexander Wachter <alexander@wachter.cloud> Thu, 17 October 2019 17:09 UTC

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To: Carles Gomez Montenegro <carlesgo@entel.upc.edu>
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From: Alexander Wachter <alexander@wachter.cloud>
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Date: Thu, 17 Oct 2019 19:10:45 +0200
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Subject: Re: [6lo] Call for feedback to draft-wachter-6lo-can-00
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Dear Carles,

On 17.10.19 18:16, Carles Gomez Montenegro wrote:

 > Thanks for your new Internet Draft submission!
Thanks for the quick feedback.

 > I have a few clarifying questions:
 >
 > - What type of power sources can we expect for CAN devices?

They are usually mains-powered. In the automotive domain, it could be 
that nodes are battery-powered, but the battery is not a constraining 
factor.

 > - What bit rate/rates is/are typical in CAN?

The bit rate depends on the used cables, cable length, environment, ...
125 kbaud should work for long lines, 1 Mbaud for classic CAN and short 
lines, and up to 8 Mbaud for CAN-FD.

 > - What kind of errors (e.g. due to BER) can we expect? Would CAN be
 > categorized as a lossy technology, or rather as a very low error rate
 > technology (e.g. Ethernet-like)?

Bit errors may occur, but that heavily depends on the wiring and 
environment. Usually, we can expect a low BER [1]. Errors during 
transmission are detected, and the frame is retransmitted automatically. 
All nodes have an error counter and disconnect from the bus when the 
counter exceeds the limit. The bus is hard-wired, and nodes do not 
disappear.

Kind regards,
Alexander

[1] 
https://pdfs.semanticscholar.org/c16e/1c68ddfe5e525d3e4cc9c3478250f5ad36df.pdf

-- 
Alexander Wachter, BSc

Student of Information and Computer Engineering
Graz University of Technology