Hi Greg, hi Jonathan,

> On Jun 23, 2016, at 20:59 , Jonathan Morton <[email protected]> wrote:
> 
> 
>> On 23 Jun, 2016, at 21:51, Greg White <[email protected]> wrote:
>> 
>> For downstream packets, the DOCSIS MAC header consists of the standard 
>> 6-byte MAC Header, plus 6 bytes for the DS EHDR and 5 bytes for the 
>> Downstream Privacy EH Element.   So, 17+14+4=35 bytes of per-packet overhead 
>> for a downstream DOCSIS MAC Frame.  For upstream packets, there will 
>> typically be only the 6-byte MAC Header, plus the 4 byte Upstream Privacy EH 
>> version 2 Element, so 10+14+4=28 bytes of per-packet overhead for an 
>> Upstream DOCSIS MAC Frame.
> 
> Thanks Greg, this is useful information for me to build into my next overhead 
> model update.

        I fully agree, thanks a lot! Note to self, now it is clear that 
upstream and downstream overhead need independent entry fields…

Best Regards
        Sebastian


> 
> - Jonathan Morton
> 

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