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1st International Workshop onCommunity Networks and FTTH/P/x1st International Workshop on1st International Workshop onCommunity Networks and FTTH/P/xCommunity Networks and FTTH/P/x
Importance of last mile Importance of last mile interoperabilityinteroperability
Eric LynskeyOctober 16, 2003
UNIVERSITY of NEW HAMPSHIRE
INTEROPERABILITY LABORATORY
Importance of last mile interoperability
OutlineOutlineOutline
• Conformance and interoperability
• Ethernet experiences
• Ethernet in the First Mile strategies
• Conclusions
• Conformance and interoperability
• Ethernet experiences
• Ethernet in the First Mile strategies
• Conclusions
UNIVERSITY of NEW HAMPSHIRE
INTEROPERABILITY LABORATORY
Importance of last mile interoperability
What is conformance?What is conformance?What is conformance?
• Implement all mandatory portions of a standard– IEEE 802.3
• “shall” and “shall not” – mandatory
• “should” and “should not” – recommendations• “may” and “may not” – options
• State diagrams and associated variables, functions, etc…• Protocol Implementation Conformance Statement (PICS)
• Implement all mandatory portions of a standard– IEEE 802.3
• “shall” and “shall not” – mandatory
• “should” and “should not” – recommendations• “may” and “may not” – options
• State diagrams and associated variables, functions, etc…• Protocol Implementation Conformance Statement (PICS)
UNIVERSITY of NEW HAMPSHIRE
INTEROPERABILITY LABORATORY
Importance of last mile interoperability
Verification of conformanceVerification of conformanceVerification of conformance
• PICS and spec. sheets– Not a guarantee of conformance
• Third party independent testing• Testing before and after system integration• Agreed upon test methodologies
• PICS and spec. sheets– Not a guarantee of conformance
• Third party independent testing• Testing before and after system integration• Agreed upon test methodologies
Test methodologiesTest methodologiesTest methodologies
• Different test tools provide different answers– Oscilloscopes, network analyzers, power meters…– Accuracy and repeatability of equipment– Testing algorithms can vary between vendors– More than one way to make a measurement
• Possible solution is to strictly define:– Test boards (probing problem)– Minimum requirements for test equipment– Test conditions
• Different test tools provide different answers– Oscilloscopes, network analyzers, power meters…– Accuracy and repeatability of equipment– Testing algorithms can vary between vendors– More than one way to make a measurement
• Possible solution is to strictly define:– Test boards (probing problem)– Minimum requirements for test equipment– Test conditions
UNIVERSITY of NEW HAMPSHIRE
INTEROPERABILITY LABORATORY
Importance of last mile interoperability
What is interoperability?What is interoperability?What is interoperability?
• Two or more devices can establish, maintain, and tear down a connection under a given set of conditions while maintaining a certain level of performance.
• Interoperability at different layers– Protocol
– Physical
• Common and agreed upon set of guidelines
• Two or more devices can establish, maintain, and tear down a connection under a given set of conditions while maintaining a certain level of performance.
• MPCP– Registration of ONU onto EPON– P2P Emulation– GATE and REPORT messages
• Optical channel– Single fiber– Lengths, number of splits– Topology (tree, bus, hybrid)– FEC for operating at high BER with MPN penalty
• MPCP– Registration of ONU onto EPON– P2P Emulation– GATE and REPORT messages
• Optical channel– Single fiber– Lengths, number of splits– Topology (tree, bus, hybrid)– FEC for operating at high BER with MPN penalty
UNIVERSITY of NEW HAMPSHIRE
INTEROPERABILITY LABORATORY
Importance of last mile interoperability
ConclusionsConclusionsConclusions
• EFM community has a lot of work to do even after the standard is complete– Prove the “unproven” technologies defined by EFM– Develop test methodologies for interoperability– Document what is not written in the standard– Test
• Development of interoperability group– Where is it placed – Combine multiple technologies (EPON, GPON…)
• EFM community has a lot of work to do even after the standard is complete– Prove the “unproven” technologies defined by EFM– Develop test methodologies for interoperability– Document what is not written in the standard– Test
• Development of interoperability group– Where is it placed – Combine multiple technologies (EPON, GPON…)