Subject: AW: On draft-ietf-pppext-posvcholo-04.txt

From: Heiles Juergen <[email-masked]>
Date: Wed, 1 Aug 2001 10:53:59 +0200

Muralidharan,

I agree with you that section 3 is not clear. It mentions only VC-3 and VC-4. VC-11/12/2 are missing.
POS ca nbe used also via these signals with and without virtual concatenation. For VC-11/12/2 the signal lable field in the VT overhead byte (bits 5 to 7) and the extended signal label in the K4 overhead byte (bit 1 wtih a multi frame) str relevant. The signal label field shall have the code "101" (escape code to extended signal label field) and the extended signal label field shall have the code OAhex (HDLC/PPP).
For virtual concatenation in addition bit 2 of the K4 overhead byte is relevant as a multi frame counter and communication channel for LCAS.
The signal lable with and without virtual cocnatenation is the same.

Section 2 should also include some examples for VC-11/12/2 (e.g. 10 Mbit/s transport).

Regards

Juergen

> -----Ursprüngliche Nachricht-----
> Von: R. Muralidharan [mailto:[email-masked]]
> Gesendet: Mittwoch, 25. Juli 2001 14:24
> An: [email-masked]
> Betreff: On draft-ietf-pppext-posvcholo-04.txt
> 
> 
> Hi All,
> 
>     the Fourth version of the draft states that "lower levels 
> of VC are
> defined in the telecommunications standards for use if 
> needed". In view of
> this, it is suggested that the following be considered:
> Section 3 be modified to include the following info for lower 
> order VC.
> For higher order VC, SONET POH bytes C2 and H4 are used and 
> for Low order
> VC, the POH byte C2 and VT overhead byte V5 are used.
> 
> Further, when an STS-1 carries VT traffic containing POS 
> which is virtually
> concatenated,  is there special symbol for the C2 byte defined? This
> condition occurs when one tries to map 10Mbps Ethernet 
> traffic onto 7 VT1.5s
> in low order VC mode.
> 
> Thanks in advance
> regards,
> Muralidharan
> 
> ----- Original Message -----
> From: <[email-masked]>
> To: <IETF-Announce:>
> Cc: <[email-masked]>
> Sent: Tuesday, July 24, 2001 4:02 PM
> Subject: I-D ACTION:draft-ietf-pppext-posvcholo-04.txt
> 
> 
> > A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> > This draft is a work item of the Point-to-Point Protocol Extensions
> Working Group of the IETF.
> >
> > Title : Extending PPP over SONET/SDH, with virtual
> >                           concatenation, high order and low 
> order payloads
> > Author(s) : N. Jones, C. Murton
> > Filename : draft-ietf-pppext-posvcholo-04.txt
> > Pages : 8
> > Date : 23-Jul-01
> >
> > The RFC 1661 Point-to-Point Protocol (PPP) [1] provides a standard
> > method for transporting multi-protocol datagrams over point-to-point
> > links. The RFC 1662 PPP in HDLC-like Framing [2] and RFC 2615 PPP
> > over SONET/SDH (POS) [3] documents describe the use of PPP over
> > Synchronous Optical Network (SONET) and Synchronous Digital
> > Hierarchy (SDH) circuits.
> 
> 
> 
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