RFC 3255 (rfc3255) - Page 2 of 8

Extending Point-to-Point Protocol (PPP) over Synchronous Optical NETwork/Synchronous Digital Hierarchy (SONET/SDH) with virtual concatenation, high order and low order payloads

Alternative Format: Original Text Document

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RFC 3255              Extending PPP over SONET/SDH            April 2002


   The only currently supported SONET/SDH SPE/VCs in RFC 2615 [3] are
   the following:

          SONET                   SDH
      ----------------------------------------
      STS-3c-SPE                  VC-4
      STS-12c-SPE                 VC-4-4c
      STS-48c-SPE                 VC-4-16c
      STS-192c-SPE                VC-4-64c

   Note that VC-4-4c and above are not widely supported in SDH networks
   at present.

   The use of virtual concatenation means that the right size SONET/SDH
   bandwidth can be selected for PPP links.

   For the convenience of the reader, the equivalent terms are listed
   below:

          SONET                   SDH
      ---------------------------------------------
      SPE                         VC
      VT (1.5/2/6)                Low order VC (VC-11/12/2)
      STS SPE                     Higher Order VC (VC-3/4/4-Nc)
      STS-1 frame                 STM-0 frame (rarely used)
      STS-1 SPE                   VC-3
      STS-1-nv                    VC-3-nv (virtual concatenation)
      STS-1 payload               C-3
      STS-3c frame                STM-1 frame, AU-4
      STS-3c SPE                  VC-4
      STS-3c-nv                   VC-4-nv (virtual concatenation)
      STS-3c payload              C-4
      STS-12c/48c/192c frame      STM-4/16/64 frame, AU-4-4c/16c/64c
      STS-12c/48c/192c-SPE        VC-4-4c/16c/64c
      STS-12c/48c/192c payload    C-4-4c/16c/64c

   This table is an extended version of the equivalent table in RFC 2615
   [3].  Additional information on the above terms can be found in
   Bellcore GR-253-CORE [4], ANSI T1.105 [5], ANSI T1.105.02 [6] and
   ITU-T G.707 [7].

2. Rate Comparisons

   Currently supported WAN bandwidth links for PPP over SONET/SDH:







Jones & Murton              Standards Track

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