[chbot] Bit error rate testing

[hamster]

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 
> 
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