XAUI as a SUPI Alternative
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1 Rich Taborek Tampa, FL nserial November 6-9, 2000 IEEE P802.3ae Task Force 1
2 Presentation Purpose Why Propose This Now? Why Wasn t This Proposed Before? Illustrate WAN PHY & Its Interfaces Describe WAN PHY Extensions Advantages Summary November 6-9, 2000 IEEE P802.3ae Task Force 2
3 Why Propose This Now? What Has Changed? Very Strong Support For Perceived Weak Support for SUPI IEEE P802ae New Features Deadline If A Change Is To Be Made, Now Is The Time Optical Transceiver Module Activity XGP: Ten Gigabit Pluggable Applicable to 10GE, 10GFC, InfiniBand, OIF (8b/10b) PCS/PMA Is The Primary Interface SUPI Electrical Similar, But Logic Very Different SUPI Forces Significantly Different PMD Specs November 6-9, 2000 IEEE P802.3ae Task Force 3
4 Why Wasn t This Proposed Before? Datacom vs. Telecom Tradition Coded vs. Scrambled Divergence Of LAN/WAN PHY Objectives Claims That Is Not Applicable WAN PHY Data Area Is Pseudo Random Not True: A1/A2 Is Fixed And Not Scrambled WAN PHY Data Has No Frame Or Gap Codes Not True: A1/A2 Is Fixed And Represents An IPG Its Time To Dispell False Claims And Provide The Best P802.3ae Solutions November 6-9, 2000 IEEE P802.3ae Task Force 4
5 Current WWDM WAN PHY Media Access Control (MAC) Reconciliation XGMII Physical Coding Sublayer 1 (PCS) Physical Coding Sublayer 2 (WIS) 16-bit parallel SUPI SS SS Physical Medium Attachment (PMA) Physical Medium Dependent (PMD) 64b/66b Coding (Packet Delineation) SONET Framing & x 7 +x 6 +1 Scrambler (WAN Compatibility) SUPI ( Gbaud) or 16-bit parallel (OIF) SerDes & CDR E/O November 6-9, 2000 IEEE P802.3ae Task Force 5
6 LAN/WAN PHY Components XGMII 64b/66b WIS 8b/10b XSBI Serial PMA SUPI LAN WAN WAN LAN Serial PMD WWDM PMD November 6-9, 2000 IEEE P802.3ae Task Force 6
7 LAN/WAN PHY Proposal XGMII 64b/66b WIS 8b/10b XSBI Serial PMA LAN WAN WAN LAN Serial PMD WWDM PMD November 6-9, 2000 IEEE P802.3ae Task Force 7
8 Proposed WWDM WAN PHY Media Access Control (MAC) XGMII Physical Coding Sublayer 1 (PCS) Physical Coding Sublayer 2 (WIS) Reconciliation Physical Medium Dependent (PMD) 64b/66b Coding (Packet Delineation) SONET Framing & x 7 +x 6 +1 Scrambler (WAN Compatibility) ( Gbaud) E/O November 6-9, 2000 IEEE P802.3ae Task Force 8
9 w/integrated MAC/PCS Media Access Control (MAC) Physical Coding Sublayer 1 (PCS) Physical Coding Sublayer 2 (WIS) Physical Medium Dependent (PMD) 64b/66b Coding (Packet Delineation) SONET Framing & x 7 +x 6 +1 Scrambler (WAN Compatibility) ( Gbaud) E/O November 6-9, 2000 IEEE P802.3ae Task Force 9
10 w/discrete MAC/PCS Media Access Control (MAC) Reconciliation XGMII Physical Coding Sublayer 1 (PCS) Physical Coding Sublayer 2 (WIS) Physical Medium Dependent (PMD) 64b/66b Coding (Packet Delineation) SONET Framing & x 7 +x 6 +1 Scrambler (WAN Compatibility) ( Gbaud) E/O November 6-9, 2000 IEEE P802.3ae Task Force 10
11 Particulars Replace SUPI/SS with /: Utilizes A1/A2 Bytes As Idle Sequence A1/A2 = Random A K R K Code-Groups Used For Synchronization A Columns Used For Deskew R Columns Not Used. A1/A2 Length Fixed. Both SUPI Use Recovered Clock To Attenuate Jitter Supports Link Status (RF, LF, BL) Non-A1/A2 WAN PHY Payload Is Not Affected A1/A2 Reconstructed At (8b/10b) Receiver November 6-9, 2000 IEEE P802.3ae Task Force 11
12 A1/A2 A1/A2 Located In Section Overhead Easy To Locate, Replace, Reconstruct Also Used For WIS Synchronization WIS Expects A1/A2 To Appear Once Every Octets (Length Of The Frame) A1/A2 transition (frame marker) A1/A2 Not Scrambled A1 A1 A2 A2 J0Z0 Z0 Transport Overhead Envelope Capacity November 6-9, 2000 IEEE P802.3ae Task Force 12
13 Advantages Single Serial Bus Specifications For WWDM Logical And Electrical Applicable to LAN And WAN PHY Single (Closer?) WWDM PMD Specification 3.125/3.110 () vs /2.488 (/SUPI) Same 8b/10b Transmission Code for WAN/LAN Scalable To Any Number Of Lanes Being Proposed to OIF for SPI-5, SFI-5, VSR Lanes, OC768 Rate (~40 Gbps) Simplest & Robust Sync, Deskew Provides Link Status Transport Supports (RF, LF, BL) November 6-9, 2000 IEEE P802.3ae Task Force 13
14 Motion Move that the P802.3ae Task Force authorize an ad hoc to develop a parallel draft targeted to replace SUPI/SS with an 8b/10b based signaling method as proposed in taborek_3_1100.pdf. Final decision to be made at the March Plenary. Moved: R. Taborek Voters Y: 76 N: 23 A: 23 Second: Tom Dineen Attendees Y: 114 N: 31 A: 39 Motion Passes November 6-9, 2000 IEEE P802.3ae Task Force 14
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