Re: [CCAMP] Poll on ODUFlex-related encoding

"Zafar Ali (zali)" <zali@cisco.com> Tue, 05 February 2013 19:00 UTC

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From: "Zafar Ali (zali)" <zali@cisco.com>
To: Fatai Zhang <zhangfatai@huawei.com>, Lou Berger <lberger@labn.net>
Thread-Topic: [CCAMP] Poll on ODUFlex-related encoding
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Date: Tue, 5 Feb 2013 19:00:53 +0000
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Cc: CCAMP <ccamp@ietf.org>, "draft-ietf-ccamp-gmpls-ospf-g709v3@tools.ietf.org" <draft-ietf-ccamp-gmpls-ospf-g709v3@tools.ietf.org>, "draft-ietf-ccamp-gmpls-signaling-g709v3@tools.ietf.org" <draft-ietf-ccamp-gmpls-signaling-g709v3@tools.ietf.org>
Subject: Re: [CCAMP] Poll on ODUFlex-related encoding
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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 <zhangfatai@huawei.com>
Date: Tuesday, February 5, 2013 2:59 AM
To: "lberger@labn.net" <lberger@labn.net>
Cc: "ccamp@ietf.org" <ccamp@ietf.org>rg>,
"draft-ietf-ccamp-gmpls-ospf-g709v3@tools.ietf.org"
<draft-ietf-ccamp-gmpls-ospf-g709v3@tools.ietf.org>rg>,
"draft-ietf-ccamp-gmpls-signaling-g709v3@tools.ietf.org"
<draft-ietf-ccamp-gmpls-signaling-g709v3@tools.ietf.org>
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>