Structure-Agnostic Time Division Multiplexing (TDM) over Packet (SAToP)
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From: The IESG <firstname.lastname@example.org> To: IETF-Announce <email@example.com> Cc: Internet Architecture Board <firstname.lastname@example.org>, RFC Editor <email@example.com>, pwe3 mailing list <firstname.lastname@example.org>, pwe3 chair <email@example.com> Subject: Protocol Action: 'Structure-Agnostic TDM over Packet (SAToP)' to Proposed Standard The IESG has approved the following document: - 'Structure-Agnostic TDM over Packet (SAToP) ' <draft-ietf-pwe3-satop-06.txt> as a Proposed Standard This document is the product of the Pseudowire Emulation Edge to Edge Working Group. The IESG contact persons are Mark Townsley and Jari Arkko. A URL of this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-pwe3-satop-06.txt
- Technical Summary This document describes a structure agnostic pseudowire encapsulation for low-rate TDM (T1, E1, T3, E3) bit-streams. This TDM encapsulation disregards any structure that may be imposed on these streams, in particular standard TDM framing (e.g. as defined in ITU-T Recommendation G.704). SAToP satisfies the requirement for "emulation of unstructured TDM circuits" as defined in the PWE3 TDM Requirements draft, and can furthermore be used for structured TDM for those cases wherein the end-points need not interpret TDM structure nor participate in the TDM signaling. The solution presented in this ID conforms to the PWE3 architecture described in RFC 3985 and satisfies both the relevant general requirements put forward in RFC 3916 requirements for unstructured TDM signals presented in RFC4197 - Working Group Summary This draft was the result of several years of continuous discussion by a subset of PWE3 WG participants, and is supported by the great majority of those involved. The only point of disagreement centered on one optional mode, namely the "octet-aligned" mode for emulation of unstructured T1 circuits. At a late stage one WG participant suggested making this mode MANDATORY rather than OPTIONAL, but this position did not gain further support. - Protocol Quality SAToP was adopted by ITU-T SG-13 Question 5 (now Question 7), and has been incorporated into ITU-T Recommendation Y.1413 under the name â€œstructure agnostic transportâ€? (clause 9.1). It has furthermore been reviewed by the MFA Forum where it was incorporated into MPLS Implementation Agreement 8.0.0, and by the Metro Ethernet Forum where it was incorporated into MEF Implementation Agreement 8. The universal acceptance of SAToP by all SDOs that have reviewed it strongly demonstrates its applicability and quality. There are at least four independent, interworking implementations of this pseudowire type.