'7(3RZHUYLD0', 'LVFRYHU\3URFHVV G. Vergnaud / R. Gass / R. Jaeger ALCATEL [email protected] [email protected] [email protected] DTE Power via MDI analysis ALCATEL BUSINESS SYSTEMS G. Vergnaud, R. Gass, R. Jaeger Page 1 Economic and technical feasibility : PD side ▼ Three types of such terminations : L L To remote To remote power C2 C1 power C1 source source DC/DC Converter DC/DC Converter To local power Case 1: terminal without local power source Case 2- terminal with local power & basic protection To remote L power & Case 3- terminal with local power & source C1 protection including possible reverse polarity of the remote power DC/DC Converter To local power ▼ C1 is the capacitor naturally present at terminal DC/DC converter input ▼ Only one requirement C2 ≥ 200nF DTE Power via MDI analysis ALCATEL BUSINESS SYSTEMS G. Vergnaud, R. Gass, R. Jaeger Page 2 Economic and technical feasibility : PSE side (block diagram) AC open Function needed for circuit discovery process detector AC discovery voltage control AC discovery 5kHz/1Vppvoltage injector DC open circuit detector DC discovery voltage control DC discovery -5V voltage injector From/To FPGA (State machine) From Ethernet physical chip To Link/Terminal Optional insulation (Environment B requirement) Over current -5V detector Power control & Fault Detection -48V Current Power control limiter DTE Power via MDI analysis ALCATEL BUSINESS SYSTEMS G. Vergnaud, R. Gass, R. Jaeger Page 3 Economic and technical feasibility : PSE side (mock-up used for tests) Alternative voltage injector AC open circuit R1 detector DC open circuit detector Low direct voltage injector R2 DTE Power via MDI analysis ALCATEL BUSINESS SYSTEMS G. Vergnaud, R. Gass, R. Jaeger Page 4 Economic and technical feasibility : PSE side (BOM of one possible implementation) Functions Component types Number Cost Resistor 4 AC discovery Capacitor 2 0,3US$ voltage injector Diode 3 Op Amp 1 Resistor 12 AC open circuit Capacitor 4 0,5US$ detector Diode 2 Op Amp 3/4 Quad Resistor 6 DC discovery Transistor 2 0,06US$ voltage injector Diode 1 Resistor 6 DC open circuit Capacitor 1 0,06US$ detector Transistor 1 Op Amp 1/4 Quad State machine 1/16 of a XCS20 25 CLB 0,37US$ ▼Globally there are 46 small SMD components for the discovery part : 28 resistors, 7 capacitors, 3 transistors, 6 diodes, and 2 OP Amp chips. DTE Power via MDI analysis ALCATEL BUSINESS SYSTEMS G. Vergnaud, R. Gass, R. Jaeger Page 5 Economic and technical feasibility : Manageability ▼ Items manageable : ☛Enable/disable output power ☛Level of deliverable current ▼ Items available : ☛Power status (power sent or not) ☛Fault at PSE output ☛Level of delivered current DTE Power via MDI analysis ALCATEL BUSINESS SYSTEMS G. Vergnaud, R. Gass, R. Jaeger Page 6 Robustness : state machine Power_on=true PSE IDLE 1,5V_AC_off Power control & 5V_DC_off Fault detection 48V_DC_off Discovery enable=true PSE DETECTION :TEST ALTERNATIVE VOLTAGEDiscovery Process 1,5V_AC_on 5V_DC_off 48V_DC_off 1,5V_AC_open_circuit=false 5V_DC_open_circuit = true PSE DETECTION : TEST PSE POWER DIRECT VOLTAGE Discovery is successful 1,5V_AC_on 1,5V_AC_on 5V_DC_on 5V_DC_off 48V_DC_off 48V_DC_on 5V_DC_open_circuit=false + timer1 1,5V_AC_open_circuit = true 48V_DC_short_circuit = true PSE DISCONNECT : PSE FAULT :SHORT NON POWERED DEVICE CIRCUIT SOMEWHERE 1,5V_AC_off 1,5V_AC_off 5V_DC_on 5V_DC_off 48V_DC_off 48V_DC_off 5V_DC_open_circuit = true Timer2 DTE Power via MDI analysis ALCATEL BUSINESS SYSTEMS G. Vergnaud, R. Gass, R. Jaeger Page 7 Robustness : measurements with AC voltage at end of a 120m cable. ▼ Voltage ratio between open_circuit and non-open_circuit = 3. Conclusion can be done without any ambiguity. Measurements are done at R1 extremities. DTE Power via MDI analysis ALCATEL BUSINESS SYSTEMS G. Vergnaud, R. Gass, R. Jaeger Page 8 Robustness : measurements with AC voltage at end of a 0m cable. ▼ Voltage ratio between open_circuit and non-open_circuit = 12. Conclusion can be done without any ambiguity. Measurements are done at R1 extremities. DTE Power via MDI analysis ALCATEL BUSINESS SYSTEMS G. Vergnaud, R. Gass, R. Jaeger Page 9 Robustness : measurements under DC voltage ▼ Voltage ratio between a terminal not to be powered and a terminal to be powered = 6. Conclusion can be done without any ambiguity. Measurements are done at R2 extremities. DTE Power via MDI analysis ALCATEL BUSINESS SYSTEMS G. Vergnaud, R. Gass, R. Jaeger Page 10 Robustness : load time for capacitor ▼ Peak load current = 15mA DTE Power via MDI analysis ALCATEL BUSINESS SYSTEMS G. Vergnaud, R. Gass, R. Jaeger Page 11 Robustness = Based on solution simplicity ▼ To decide to send power two events are necessary : ☛Detect a non open-circuit under alternative voltage ☛Detect an open circuit under direct voltage after a timer less than 150ms. ▼ If these two events do not occur then power is not sent. ▼ While power is sent, it will be switch off if, and only if, an AC open circuit is detected. ▼ Consequences : ☛If a short is present on the link during the discovery processing, power will not be sent (since there is not AC open circuit but there is not DC open circuit too). ☛If a legacy terminal (not to be powered) is present on the link, even in parallel with another to be powered, power will not be sent (since there is not AC open circuit but there is not DC open circuit too). ☛If a terminal to be powered is detected on the link, power will be sent and held whatever its local power status is. Therefore no extra power will be spent without necessity. DTE Power via MDI analysis ALCATEL BUSINESS SYSTEMS G. Vergnaud, R. Gass, R. Jaeger Page 12 Solutions comparison : discovery efficiency Type of solution Features Capa & AC/DC Diode Resistor Capa & DC analysis analysis Solution usable on Ye s Ye s ? Ye s both pair s ets PD detected ==> Ye s Ye s Ye s Ye s Power sent No P D de te c te d Ye s Ye s Ye s Ye s ==> Power not sent PD disconnection Power stopped Power stopped Power stopped Power stopped Power sent when No No No No short present Power sent when mixed terminal ?No?No types in parallel Power sent and held when PD No No No Ye s loc a lly powe re d ▼ Major point : A PD locally powered must be powered from PSE. This is the current case in PBX and end-user does not want to change that. ▼ The three first solutions are not able to solve naturally this problem. It is necessary to spend unused power to hold the power feeding toward a PD locally powered. DTE Power via MDI analysis ALCATEL BUSINESS SYSTEMS G. Vergnaud, R. Gass, R. Jaeger Page 13 Solutions comparison : needed hardware Type of solution Functions Capa & AC/DC Diode Resistor Capa & DC analysis analysis Power current XXX analyzer Low DC voltage or XXX ra m p inje c tor DC voltage or XXX At PSE side current analyzer AC voltage or pulse X X injector AC voltage or return X X pulse analyzer Signature 2resistors, one (additional diode, one One resistor None One capacitor components) capacitor At P D s id e Hardware to hold power to a PD XXX locally powered Total number of functions 4444 Necessary nb of gates to do, at PSE ? ? ? 1250 (25 CLB) side, one channel state machine ▼ All solutions need globally the same number of functions. ▼ Concerning our proposal, notice the state machine simplicity (25 CLB). DTE Power via MDI analysis ALCATEL BUSINESS SYSTEMS G. Vergnaud, R. Gass, R. Jaeger Page 14 Testing ▼ Hazard matrix Signal pairs (1,2/3,6) Spare pairs (4,5/7,8) Equipment Power status Power via MDI DC voltage test AC voltage test DC voltage test AC voltage test Terminals Compaq Armada OFF 1V 300mV 1V 300mV M700 ON 1V 300mV 1V 300mV Compaq Deskpro OFF 1,1V 300mV 1,1V 300mV Not Sent DP4000 ON 1,1V 300mV 1,1V 300mV OFF 0,9V 280mV 0,9V 280mV Sun Ultra 5 ON 0,9V 280mV 0,9V 280mV Tests Equipments Wandel & Golderman OFF 0V 50mV 0V 360mV Sent on spare pairs DA30C ON 0V 50mV 0V 350mV but w/o damage Microtest MT350 OFF 0V 50mV 0V 50mV Scanner ON 0V 50mV 0V 50mV Not Sent OFF 0V 50mV 0,16V max 50mV Microtest Injector ON 0V 50mV 0,6V max 50mV Legacy Equipments OFF 0V 50mV 0V 50mV 3Com Hub8/TPO ON 0V 50mV 1,2V 50mV OFF 0,93V 380mV 0,94V 390mV Accton Fast Switch Not Sent ON 0,93V 380mV 0,94V 390mV Shiva LanRover/Eplus OFF 0,93V 380mV 0,94V 390mV (Token Ring) ON 0,93V 380mV 0,94V 390mV DTE Power via MDI analysis ALCATEL BUSINESS SYSTEMS G. Vergnaud, R. Gass, R. Jaeger Page 15 Testing ▼ Hazard matrix (cont’d) Signal pairs (1,2/3,6) Spare pairs (4,5/7,8) Equipment Power status Power via MDI DC voltage test AC voltage test DC voltage test AC voltage test Alcatel OFF 0V 20mV 0,94V 380mV Omnistack 6024 ON 0V 20mV 0,94V 380mV OFF 0,93V 360mV 0,94V 380mV Omnistack 5024 ON 0,93V 360mV 0,94V 380mV OFF 0V 20mV 0,94V 380mV OmniStack 4024 ON 0V 20mV 0,94V 380mV Not sent OFF 0,93V 380mV 0,94V 380mV OmniSwitch (EFX board) ON 0,93V 380mV 0,94V 380mV OFF0V20mV0V20mV OmniStack (Olmd version) ON 0V 20mV 0V 20mV OFF0V20mV0V20mV LSS210 ON 0V 20mV 0V 20mV BayNetwork OFF0V20mV0V20mV BayStack 101 ON 0V 20mV 0V 20mV OFF0V20mV0V20mV 810M ON 0V 20mV 0V 20mV OFF0V50mV0V20mV EtherSpeed Board ON 0V 50mV 0V 20mV Not Sent OFF0V20mV0V20mV 5308PS Board ON 0V 20mV 0V 20mV LattisNet 3308A board OFF0V20mV0V20mV (Synoptics) ON 0V 20mV 0V 20mV OFF 1,05V 390mV 0,94V 370mV BayStack 350 DTE Power via MDI analysis ALCATEL BUSINESS SYSTEMS G.