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`Arlan J. AndersonNetwork Edge TechnologyNovember 5, 19992of7Strict RequirementsA solution for DTE Powering via DTE must satisfy thefollowing conditions:
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`It will meet all of the requirements of existing 802.3 Ethernet LANstandards.
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`Its operation will not degrade in any way the performance of theEthernet data transmission.
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`It will not damage, or be damaged by, or have its operationdegraded, or be degraded by, any other RJ-45 or RJ-11interconnected equipment to which it may be incidentallyconnected.
`It will not cause any anomalous behavior or change the expectedoperation for any connected LAN equipment (e.g. link status LEDindicators).
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`It will meet all applicable safety standards and regulations.
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`It should be able to provide sufficient power to support a usefulrange of single IP terminal devices (e.g. IP telephones, wirelessLAN base-stations, cameras, hubs, power controls, thermostats,etc.)
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`The powering topology should allow for the easy insertion ofpower at any point along the span.
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`The power source equipment should support a MIB for SNMPsystem management (including any backup power system).
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`Arlan J. AndersonNetwork Edge TechnologyNovember 5, 19993of7Desirable RequirementsA DTE Powering solution should satisfy the followingconditions:
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`Arlan J. AndersonNetwork Edge TechnologyNovember 5, 19994of7Power Source AttributesTo satisfy the previous conditions the following LANpower source characteristics are proposed:
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`An isolated DC voltage source meeting all applicable worldwideregulatory safety requirements;
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`Metallic power feed on Pins 4-5, one of the idle pairs of the 10/100BASE-T LAN loop;
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`Each loop power feed isolated to withstand ±2250 Volts DC or1500 Volts AC for 60 sec. (IEC 60950:1991 “Hipot”);
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`The power source to each loop must be independently currentlimited to a level to be determined above the level of the maximumrated output.
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`All protection circuitry for the loop power feed must recoverautomatically without any operator intervention once the fault hasbeen removed.
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`The loop supply must be "smart," using a discovery mechanism toinsure that power is only provided to authorized terminal devices;
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`The source must provide a maintenance capability to monitor andsupply power only as long as the loop connection remains valid;
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`The source must limit the power to any non-authenticated terminalloads to protect against damage;
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`At the point of power insertion, appropriate terminations will bepresented to the network side of the LAN connection.
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`Arlan J. AndersonNetwork Edge TechnologyNovember 5, 19995of7Power Source Attributes (continued)To satisfy the previous conditions the following LANpower source characteristics are proposed:
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`Arlan J. AndersonNetwork Edge TechnologyNovember 5, 19996of7Terminal Power AttributesGiven the previous system attributes and requirementsthe power characteristics for the terminal are:
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`A terminal, which is authorized for LAN powering, must support aunique discovery mechanism for its powering authentication;
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`A target for the absolute maximum peak power consumption atthe terminal of 15 Watts;
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`A target of 10 Watts for the continuous nominal power load at theterminal;
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`At the point of power extraction, appropriate terminations will bepresented to the terminal side of the LAN connection;
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`Under no circumstances will the terminal source current into theloop (i.e. back feed);
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`The terminal port must meet the “Hipot” isolation requirements ofIEC 60950:1991.
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`Does not require any changes to the magnetics, and the potentialfor secondary effect problems;
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`Arlan J. AndersonNetwork Edge TechnologyNovember 5, 19997of7Rationale•Use of a non-signal pair for powering:
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`Allows for simple mid-span power insertion;•Use of a DC Voltage source:
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`Minimizes interference into the LAN transmission signals;
`Builds on existing, mature power back-up system technology;
`Minimizes noise and potential data transmission interference;
`A DC source enables the use of integrated silicon control circuitry.
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