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`CHRIMAR 2044
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`100 BASE-TX transmission is close to the margin for CAT-5cable performance
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`Arlan J. AndersonAccess IAD TechnologyMay 24, 20002 of 6Powering via Pairs 1-2, 3-6•Issues:
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`“Pure DC” power source and load required•Attributes:
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`Powering would work on non-standard legacy two paircabling
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`Potential noise interference into data signal
`Possible interoperation problems with legacy equipment
`Mid-span insertion likely requires data repeaters
`Uses less wires
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`Powering requires standard four pair cabling•Attributes:
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`Does not require revising specifications for existing 802.3transmission interfaces
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`“Three fingers” of isolation between the powering andsignaling pairs
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`Arlan J. AndersonAccess IAD TechnologyMay 24, 20003 of 6Powering via Pairs 4-5, 7-8•Issues:
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`Mid-span insertion of power is transparent to the data signal
`Greatly reduces interoperation risks with legacy equipment
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`(cid:216)
`(cid:216)
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`(cid:216)
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`Central back-up support for locally powered terminals mayrequire data service interruption
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`Detection on signal pairs and power on other pairs wouldcause safety and inter-operational liability problems
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`Arlan J. AndersonAccess IAD TechnologyMay 24, 20004 of 6Differential Detection•Issues:
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`May miss common mode faults e.g. DC power short•Attributes:
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`Discovery and data can share interface and PHY designcommonality
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`If detection and power are on signal pairs:
`Authentication and data signals interfere with each other
`Increases crosstalk paths at DTE end
`Detection means is IEEE 802.3 type digital signature
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`Reliability of detection subject to mechanism for unique DTEidentification
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`May miss some benign differential mode faults•Attributes:
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`(cid:216)
`(cid:216)
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`(cid:216)
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`Facilitates central back-up power authentication for locallypowered terminals
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`Arlan J. AndersonAccess IAD TechnologyMay 24, 20005 of 6Common Mode Detection•Issues:
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`Detection and power are on same pairs separate from the10/100 data pairs:
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`Approach allows integration into either power supply or PHYsilicon designs
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`Minimizes interference between discovery and data signals
`Improves control over crosstalk paths
`Reduces safety and inter-operational liability problems
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`Arlan J. AndersonAccess IAD TechnologyMay 24, 20006 of 6Conclusions•Use 4-5, 7-8 pairs for powering and detection•Minimizes interference and inter-operation risks•Facilitates mid-span power insertion and introductionof DTE powering into installed base•Simplifies engineering and required standards effort•Combining discovery and powering mechanismsminimizes safety and liability issues•Simplifying of powered DTE devices will increase themarket opportunity
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`CHRIMAR 2044
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