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S800 over Cat5 (requirements/charter proposal) Michael Johas Teener
©2002 Apple right to copy granted so long as this attribution is included Slide 2 Goals Take advantage of Gigabit Ethernet technology to use Category 5 unshielded twisted pair cabling for S800 transport 1394b links Allow appropriate negotiation to be done so that the endpoints can select which of 5 protocols to be used: –10baseT Ethernet –100baseTX Ethernet –S b –(S r) –1000baseT Ethernet –S r
©2002 Apple right to copy granted so long as this attribution is included Slide 3 Sidebar: what is 1394r? New PAR (project action request) from IEEE to update/revise (Dave, can you explain?) I think it is: Combine , 1394a-2000, 1394b-2002, 1394b errata, and S3200 improvements into one document. So I propose adding S800 (and maybe S400) over Cat5 to 1394r
©2002 Apple right to copy granted so long as this attribution is included Slide 4 Goals (continued) Allow a simple hub-like-thing to be built that: –Connects all endpoints that negotiate to Ethernet using standard hub or switch technology –Connects all endpoints that negotiate to 1394 using standard PHY or technology –Bridges IP data between the two network domains For the end user, the objective is to have a single RJ- 45 socket that is labeled network, and works for any kind of connection.
©2002 Apple right to copy granted so long as this attribution is included Slide 5 Technical justification 1000baseT links are full duplex 1000 Mbit/sec transports at the PHY (4x250Mbit/sec at the cable) … –-100ppm tolerance = Mbit/sec 1394b S800 links are full duplex (10/8)*8* Mbit/sec at the cable ( Mbit/sec) … –+100ppm tolerance Mbit/sec There is clearly enough bandwidth at the 1000baseT PHY to accept a fully encoded 1394b S800 stream
©2002 Apple right to copy granted so long as this attribution is included Slide 6 Possible interconnection 1394b Link1000baseT MAC 1394r PHY 9-pin 1394b RJ b PHY/Link GMII 1394b bilingual 1394r/ 1000baseT rate adaption 1000baseT PHY 1394r/1000baseT negotiation 1394b startup/arb/ data routing Port negotiates to 1394 Port negotiates to Ethernet
©2002 Apple right to copy granted so long as this attribution is included Slide 7 Requirements At PHY/Link interface must appear to be standard 1394b PHY At GMII must appear to be standard 1000baseT PHY When network port negotiates to be 1394, must appear to be standard 1394b port connection to 1394 management software –Looks like network unconnected to Ethernet software When a network port negotiates to be Ethernet, must appear to be standard Ethernet connection to Ethernet management software –Looks like unconnected port to 1394 software
©2002 Apple right to copy granted so long as this attribution is included Slide 8 More requirements Must support 1394b S100 as defined, and S800 using 1000baseT modulation Must support 10baseT, 100baseT, 1000baseT (full and half duplex) Ethernet Negotiation preference set at device endpoint (NOT at hub/switch/bridge) … e.g., Apple would prefer FireWire for Mac OS X, others may prefer alternate connections. –Or do we always prefer 1394?
©2002 Apple right to copy granted so long as this attribution is included Slide 9 Proposed charter Develop method for building S b links over Cat 5 wiring using 1000baseT technology. It must be possible to build a PHY that can negotiate to use either 1000baseT (and 100baseT and 10baseT) Ethernet or S800baseT (and S100baseT) Running at other speeds (such as S400 and S1600) will also be investigated.
S800base-T: the Best of Both Worlds Michael Johas Teener Plumbing Architect, Apple Computer Inc.
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