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STPP Slide 1

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The Great TDM Battle. draft-anavi-tdmoip-00 was prepared for 50th IETF ... 53 Minneapolis. 54 Yokohama. 55 Atlanta. 56 San Francisco. 57 Vienna. STPP Slide 3 ... – PowerPoint PPT presentation

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Title: STPP Slide 1


1
STPPSimpleTDMPseudowireProtocol
  • PWE3 57th IETF
  • 16 July 2003

Yaakov (J) Stein
2
The Great TDM Battle
draft-anavi-tdmoip-00 was prepared for 50th
IETF comparisons presented at 52nd IETF we have
been discussing for gt 2 years several
compromises reached and rejected the
time has come for a decision
50 Minneapolis 51 London 52 Salt Lake City 53
Minneapolis 54 Yokohama 55 Atlanta 56 San
Francisco 57 Vienna
3
draft-anavi-tdmoip-05
  • Multiple main modes to optimize for special cases
  • raw (STPP)
  • AAL1 unstructured, structured, structured w/ CAS
  • AAL2
  • HDLC
  • Various special mechanisms to cope with network
    defects
  • adaptive clock recovery
  • common clock SRTS
  • packet loss avoidance
  • packet loss concealment
  • Simple interworking with existing AAL1 and AAL2
    networks

4
draft-vainshtein-cesopsn-06
  • Evolved into a long complex draft
  • Single main mode with plethora of submodes
  • framelength locking OR frame locking
  • full multiframe in packet OR multiframe marking
  • RTP OR RTP compressed OR RTP suppressed
  • T1 octet-aligned OR 8-consectuive frames
  • optional ECMP Prevention protector
  • signaling packets OR in-packet signaling
    structure
  • Support (for which submodes?)

5
STPP
  • Simple (dumb) TDM pseudowire protocol
  • Draft is only 11 pages, readable by non-TDMers
  • Designed to cover most common TDM cases
  • clock available or unimportant
  • low packet loss
  • TDM structure unimportant
  • CAS/CCS signaling unimportant
  • Simply encapsulate arbitrary length TDM packets
  • When special sizes are needed, their use is
    encouraged
  • default sizes are those needed by CESoPSN
    implementations
  • should use sizes that simplify AAL1-interworking
    if needed
  • No special payload treatment (e.g. AAL1 buffering
    or frame-locking)
  • Highest possible BW efficiency (no extraneous
    overhead)

6
Proposal
  • Accept STPP for most common (simplest) TDM cases
  • broad support
  • easy to implement
  • Accept both TDMoIP and CESoPSN for special cases
  • structure critical
  • CAS signaling
  • high packet loss
  • problematic clock recovery
  • interworking with existing networks
  • and let the market decide
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