Re: [CCAMP] Poll on ODUFlex-related encoding

["Zafar Ali (zali)" <[e-mail]>]

Hi- 

As my last (forwarded) email would have come out out-of-context and may
not be clear 
... Trying to do the right thing so the comment are clear.

Authors, C-campers:

Please see in-line.

-----Original Message-----
From: Fatai Zhang <[e-mail]>
Date: Tuesday, February 5, 2013 2:59 AM
To: "[e-mail]" <[e-mail]>
Cc: "[e-mail]" <[e-mail]>,
"[e-mail]"
<[e-mail]>,
"[e-mail]"
<[e-mail]>
Subject: Re: [CCAMP] Poll on ODUFlex-related encoding

>Hi Lou,
>
>Nothing new information is needed because Table 7-2 in [G709-2012]
>already captures the tolerance stuff (we just failed to track the
>progress of G709 on tolerance issue).
>
>I would propose the following changes based on version 6:
>
>(1) To replace "Tolerance" with "Reseved" in the Traffic Parameters and
>remove the text for "Tolerance".
>
>(2) To add a sentence to explain *tolerance* in the formula in Section
>5.1. 
>
>The bit rate tolerance is implicit in Signal Type and the ODUflex(CBR)
>bit rate tolerance is always 100ppm as described in Table 7-2 of
>[G709-2012].
>
>    0             1             2             3
>   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>  |  Signal Type  |       N       |        Reserved       |
>  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>  |              NVC           |      Multiplier (MT)     |
>  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>  |                      Bit_Rate                       |
>  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

I just wonder are we not better off keeping Tolerance field in signaling
and adding a statement in v7 that this field is hardcoded to 100ppm.

This has advantage of interworking with earlier draft implementations and
is also flexible for various (future/ unknown) client signal types. I.e.,
we use the same encoding as defined thus far in the document (copying from
v6): 

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Signal Type  |       N       |           Tolerance           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |              NVC              |        Multiplier (MT)        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                            Bit_Rate                           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

And state that Tolerance MUST be set to 100 ppm.


Thanks

Regards...Zafar 

><snip>