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Brad Booth Principal Network Engineer, Global Networking Services 1TPCE Study Group Norfolk, VA

Auto-Negotiation Overview. Brad Booth Principal Network Engineer, Global Networking Services 1TPCE Study Group Norfolk, VA. Supporters. What is Auto-Negotiation (AN)?. Method to exchange information between 2 stations Used to configure operating parameters

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Brad Booth Principal Network Engineer, Global Networking Services 1TPCE Study Group Norfolk, VA

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  1. Auto-Negotiation Overview Brad Booth Principal Network Engineer, Global Networking Services 1TPCE Study Group Norfolk, VA

  2. Supporters

  3. What is Auto-Negotiation (AN)? • Method to exchange information between 2 stations • Used to configure operating parameters • Permits automatic link establishment without management intervention • Uses lane 0 even with multi-lane protocols

  4. 802.3 Auto-Negotiation • More than one auto-negotiation protocol • Clause 28 – Has been the primary twisted-pair protocol for eons • Clause 37 – Was used for 1000BASE-X… and never again • Clause 73 – Used for backplane and copper cable assembly (e.g. twinax) • Establish the operating parameters before bringing up the link • Clause 28 uses fast link pulses (FLP) • Clause 73 uses differential Manchester encoding (DME) • Clause 37 determines operating parameters after the link is up

  5. Base Pages • Establishes the primary operating parameters of the link • Duplex • Rate • Coding/FEC • Issues the call for next pages (NP) or extended next pages (XNP) if required • 1000BASE-T and 10GBASE-T require NP or XNP Ethernet Technology Summit - April 2014

  6. Next Pages • Next pages and extended next pages are exchanged one at a time • Pages are exchanged until both stations have exhausted their next pages • May communicate other relevant operating parameters • Master/slave • Pause • Vendor-specific information • Message format specified • Information exchanged is up to the implementer Ethernet Technology Summit - April 2014

  7. Negotiating Auto-Negotiation • 802.3 has more than one auto-negotiation protocol • Use one as is, edit existing one or create new? • Edit is recommended… Clause 28? New clause? • What is 802.3bp doing? • Is plug’n’play interoperability needed? • Is rate negotiation required? Ability to bypass rate negotiation? • Anything else that may require negotiation? • Mandatory or optional? • Can be rate dependent

  8. Thoughts… • Decide on adding AN objective to 802.3bp and the 1TPCE study group • Each effort may decide whether AN is optional or mandatory • Once decision is to do AN for both, future discussions on: • New, re-use, etc. • Base pages, next pages • Bypass, etc. Ethernet Technology Summit - April 2014

  9. Thank You!

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