[chbot] Bit error rate testing

Peter Harris petes.username at gmail.com
Tue Jul 20 21:35:05 BST 2021

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 :)

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.
>   P
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