Survey Results on Data Collection Changes in Education
The survey conducted in May 2019 by the Office of Superintendent of Public Instruction, under State Superintendent Chris Reykdal, gathered insights on roles in education, school districts represented, methods for collecting transition IEP data, timelines for data submission, and more.
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Presentation Transcript
Global Foundation Services Auto-Negotiation Overview Brad Booth Principal Network Engineer, Global Networking Services 1TPCE Study Group Norfolk, VA
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
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
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 5
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 6
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
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 8
Thank You! Global Foundation Services
