Re: [ippm] missed comments on draft-mirsky-ippm-epm in today's IPPM meeting

Greg made a comment that EPM is similar to the High Precision Service 
Metrics that Alex presented. I appreciate if Greg can elaborate on these 
similarities.

Thanks

Hesham

On 11/11/2021 11:32 AM, Yangfan(Fan,IP Standards) wrote:
>
> Dear authors,
>
> Due to limited time in today's meeting, I had to come back to the list 
> with my comments.
>
> 1)In the draft, the terminology of error is not explicitly defined. We 
> wouldn't know what metric/event/state would be called as error. The 
> I-D mentioned ITU-T G.826, it is confusing whether it is the error bit 
> in constant bit rate transmission. It will be good to clarify it in 
> later revisions.
>
> 2)EPM is mentioned as a state based mechanism. I question whether it 
> is an effective way in packet switched network. In PSN, BER value on 
> physical interface is commonly used as the parameter to indicate error 
> on physical links. Why bother to define the statistical multiplexing 
> parameters?
>
> 3)The concept of Xaas imported in the new revision is quite confusing 
> to me. What exactly relations between Xaas and EPM, what relations it 
> is between MTBF/MTTR metrics and ES/SES/EFS metrics defined for Xaas 
> and EPM respectively?
>
> It is much appreciated if the authors can kindly clarify the questions.
>
> Best regards,
>
> Fan
>
>
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