[chbot] Bit error rate testing

[Peter Harris]

Thanks, you have put me on the right track, I think it was PBRS9 as we
implemented it with a lookup table for speed. A 511 byte table is
reasonable, a 32k one would not have been.
I am checking the quality of the link that will carry solar telemetry to my
shed to see if I need to use cable.

I'll bring the fish :)
  P

On Tue, 20 Jul 2021 at 16:23, hamster <hamster at snap.net.nz> wrote:

> Most likely PRBS15
>
> https://en.wikipedia.org/wiki/Pseudorandom_binary_sequence
>
>
> On 20.07.2021 16:02, Peter Harris wrote:
>
> Hi All
> For a chocolate fish at the next meeting: I am looking for the name of a
> specific industry standard BER test for serial data we used at Tait to
> check base station links. It was in the TB8100 and I remember
> reimplementing it for the DMR variant but memory rust has hidden the name
> and my Google foo has failed to find it.
>
> What I remember:
> - A fixed bit sequence was sent repeatedly down the link.
>  - The sequence was constructed such that once enough bits (possibly 14)
> had been received anywhere in the sequence the expected value of the next
> bit could be predicted.
> - The sequence length was one bit short of filling a whole number of bytes
> so it could be sent 8 times before bytes started to repeat.
>
> BFN
>   P
>
>
> _______________________________________________
> Chchrobotics mailing list Chchrobotics at lists.ourshack.com
> https://lists.ourshack.com/mailman/listinfo/chchrobotics
> Mail Archives: http://lists.ourshack.com/pipermail/chchrobotics/
> Meetings usually 3rd Monday each month. See http://kiwibots.org for
> venue, directions and dates.
> When replying, please edit your Subject line to reflect new subjects.
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ourshack.com/pipermail/chchrobotics/attachments/20210721/afeda0b2/attachment.html>