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Interleaving

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I am trying to make sure I understand interleaving. I understand interleaving as follows.

non interleaved: aaaaabbbbbcccccdddddeeeeefffffggggg

interleaved: abcdefgabcdefgabcdefgabcdefgabcdefg

This protects data loss. In the ANT+ protocol I notice it suggests interleaving messages at certain rates (for example every 121 messages). Though not exactly the same as above I think I understand what it means. I will try and explain my understanding below.

Assume the following.
Main Data Page = M
Common Data Page = C

If my system had a frequency of 4 Hz, Main Data Pages sent at 4 Hz and Common Data Pages sent at 1 Hz my message structured would be as follows.

MMMMCMMMCMMMCMMMC

Is this correct?

The other option would be that the fourth messages was (M+C), but I don't think this is correct.

MMMM(M+C)MMM(M+C)MMM(M+C)

Thanks,

Take care,

Jon      
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You are correct in your assumption of MMMCMMMC...

Best Regards