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IEEE 8802-3:2021/Amd2-2021

IEEE 8802-3:2021/Amd2-2021

$109.96

IEEE/ISO/IEC-Telecommunications and exchange between information technology systems — Requirements for local and metropolitan area networks — Part 3:
Standard for Ethernet AMENDMENT 2: Physical layer and management parameters for power over Ethernet over 4 pairs

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IEEE 2021
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Adoption Standard – Active. The maximum Powered Device (PD) power available is increased by this amendment to IEEE Std 802.3-2018 by utilizing all four pairs in the specified structured wiring plant. This represents a substantial change to the capabilities of Ethernet with standardized power. The power classification information exchanged during negotiation is extended to allow meaningful power management capability. These enhancements solve the problem of higher power and more efficient standardized Power over Ethernet (PoE) delivery systems.

PDF Catalog

PDF Pages PDF Title
4 Blank Page
5 Title page
7 Important Notices and Disclaimers Concerning IEEE Standards Documents
10 Participants
13 Introduction
15 Contents
25 1. Introduction
1.3 Normative references
1.4 Definitions
26 1.5 Abbreviations
27 14. Twisted-pair medium attachment unit (MAU) and baseband medium, type 10BASE-T including type 10BASE-Te
14.3 MAU electrical specifications
14.3.1 MAU-to-MDI interface characteristics
14.3.1.1 Isolation requirement
28 25. Physical Medium Dependent (PMD) sublayer and baseband medium, type 100BASE-TX
25.4 Specific requirements and exceptions
25.4.5 Change to 9.1.7, “Worst case droop of transformer”
25.4.6 Replacement of 8.4.1, “UTP isolation requirements”
25.4.7 Addition to 10.1, “Receiver”
29 25.6 Protocol implementation conformance statement (PICS) proforma for Clause 25, Physical Medium Dependent (PMD) sublayer and baseband medium, type 100BASE-TX
25.6.3 Major capabilities/options
25.6.3.1 DTE Power via MDI Power over Ethernet major capabilities/options
25.6.4 PICS proforma tables for the Physical Medium Dependent (PMD) sublayer and baseband medium, type 100BASE-TX
25.6.4.4 DTE Power via MDI Power over Ethernet compliance
30 30. Management
30.2 Managed objects
30.2.2 Overview of managed objects
30.2.2.1 Text description of managed objects
30.2.3 Containment
31 30.2.5 Capabilities
39 30.9 Management for DTE Power via MDI Power over Ethernet
30.9.1 PSE managed object class
30.9.1.1 PSE attributes
30.9.1.1.2 aPSEAdminState
30.9.1.1.3 aPSEPowerPairsControlAbility
30.9.1.1.4 aPSEPowerPairs
40 30.9.1.1.5 aPSEPowerDetectionStatus
30.9.1.1.5a aPSEPowerDetectionStatusA
41 30.9.1.1.5b aPSEPowerDetectionStatusB
30.9.1.1.6 aPSEPowerClassification
42 30.9.1.1.6a aPSEPowerClassificationA
30.9.1.1.6b aPSEPowerClassificationB
43 30.9.1.1.7 aPSEInvalidSignatureCounter
30.9.1.1.7a aPSEInvalidSignatureCounterA
30.9.1.1.7b aPSEInvalidSignatureCounterB
30.9.1.1.8 aPSEPowerDeniedCounter
44 30.9.1.1.8a aPSEPowerDeniedCounterA
30.9.1.1.8b aPSEPowerDeniedCounterB
30.9.1.1.9 aPSEOverLoadCounter
30.9.1.1.9a aPSEOverLoadCounterA
45 30.9.1.1.10 aPSEShortCounter aPSEOverLoadCounterB
30.9.1.1.11 aPSEMPSAbsentCounter
30.9.1.1.11a aPSEMPSAbsentCounterA
46 30.9.1.1.11b aPSEMPSAbsentCounterB
30.9.1.2 PSE actions
30.9.1.2.1 acPSEAdminControl
30.12 Layer Management for Link Layer Discovery Protocol (LLDP)
30.12.2 LLDP Local System Group managed object class
30.12.2.1 LLDP Local System Group attributes
30.12.2.1.6 aLldpXdot3LocPowerMDISupported
30.12.2.1.7 aLldpXdot3LocPowerMDIEnabled
47 30.12.2.1.8 aLldpXdot3LocPowerPairControllable
30.12.2.1.9 aLldpXdot3LocPowerPairs
30.12.2.1.10 aLldpXdot3LocPowerClass
48 30.12.2.1.14 aLldpXdot3LocPowerType
30.12.2.1.17 aLldpXdot3LocPDRequestedPowerValue
30.12.2.1.17a aLldpXdot3LocPDRequestedPowerValueA
49 30.12.2.1.17b aLldpXdot3LocPDRequestedPowerValueB
30.12.2.1.18 aLldpXdot3LocPSEAllocatedPowerValue
30.12.2.1.18a aLldpXdot3LocPSEAllocatedPowerValueA
30.12.2.1.18b aLldpXdot3LocPSEAllocatedPowerValueB
50 30.12.2.1.18c aLldpXdot3LocPSEPoweringStatus
30.12.2.1.18d aLldpXdot3LocPDPoweredStatus
30.12.2.1.18e aLldpXdot3LocPowerPairsExt
30.12.2.1.18f aLldpXdot3LocPowerClassExtA
51 30.12.2.1.18g aLldpXdot3LocPowerClassExtB
30.12.2.1.18h aLldpXdot3LocPowerClassExt
52 30.12.2.1.18i aLldpXdot3LocPowerTypeExt
30.12.2.1.18j aLldpXdot3LocPDLoad
30.12.2.1.18k aLldpXdot3LocPD4PID
30.12.2.1.18l aLldpXdot3LocPSEMaxAvailPower
30.12.2.1.18m aLldpXdot3LocPSEAutoclassSupport
53 30.12.2.1.18n aLldpXdot3LocAutoclassCompleted
30.12.2.1.18o aLldpXdot3LocAutoclassRequest
30.12.2.1.18p aLldpXdot3LocPowerDownRequest
30.12.2.1.18q aLldpXdot3LocPowerDownTime
30.12.2.1.18r aLldpXdot3LocMeasVoltageSupport
54 30.12.2.1.18s aLldpXdot3LocMeasCurrentSupport
30.12.2.1.18t aLldpXdot3LocMeasPowerSupport
30.12.2.1.18u aLldpXdot3LocMeasEnergySupport
30.12.2.1.18v aLldpXdot3LocMeasurementSource
30.12.2.1.18w aLldpXdot3LocMeasVoltageRequest
30.12.2.1.18x aLldpXdot3LocMeasCurrentRequest
55 30.12.2.1.18y aLldpXdot3LocMeasPowerRequest
30.12.2.1.18z aLldpXdot3LocMeasEnergyRequest
30.12.2.1.18aa aLldpXdot3LocMeasVoltageValid
30.12.2.1.18ab aLldpXdot3LocMeasCurrentValid
30.12.2.1.18ac aLldpXdot3LocMeasPowerValid
56 30.12.2.1.18ad aLldpXdot3LocMeasEnergyValid
30.12.2.1.18ae aLldpXdot3LocMeasVoltageUncertainty
30.12.2.1.18af aLldpXdot3LocMeasCurrentUncertainty
30.12.2.1.18ag aLldpXdot3LocMeasPowerUncertainty
30.12.2.1.18ah aLldpXdot3LocMeasEnergyUncertainty
57 30.12.2.1.18ai aLldpXdot3LocVoltageMeasurement
30.12.2.1.18aj aLldpXdot3LocCurrentMeasurement
30.12.2.1.18ak aLldpXdot3LocPowerMeasurement
30.12.2.1.18al aLldpXdot3LocEnergyMeasurement
30.12.2.1.18am aLldpXdot3LocPSEPowerPriceIndex
58 30.12.3 LLDP Remote System Group managed object class
30.12.3.1 LLDP Remote System Group attributes
30.12.3.1.6 aLldpXdot3RemPowerMDISupported
30.12.3.1.7 aLldpXdot3RemPowerMDIEnabled
30.12.3.1.8 aLldpXdot3RemPowerPairControllable
30.12.3.1.9 aLldpXdot3RemPowerPairs
59 30.12.3.1.10 aLldpXdot3RemPowerClass
30.12.3.1.14 aLldpXdot3RemPowerType
30.12.3.1.17 aLldpXdot3RemPDRequestedPowerValue
60 30.12.3.1.17a aLldpXdot3RemPDRequestedPowerValueA
30.12.3.1.17b aLldpXdot3RemPDRequestedPowerValueB
30.12.3.1.18 aLldpXdot3RemPSEAllocatedPowerValue
61 30.12.3.1.18a aLldpXdot3RemPSEAllocatedPowerValueA
30.12.3.1.18b aLldpXdot3RemPSEAllocatedPowerValueB
30.12.3.1.18c aLldpXdot3RemPSEPoweringStatus
30.12.3.1.18d aLldpXdot3RemPDPoweredStatus
62 30.12.3.1.18e aLldpXdot3RemPowerPairsExt
30.12.3.1.18f aLldpXdot3RemPowerClassExtA
30.12.3.1.18g aLldpXdot3RemPowerClassExtB
63 30.12.3.1.18h aLldpXdot3RemPowerClassExt
30.12.3.1.18i aLldpXdot3RemPowerTypeExt
30.12.3.1.18j aLldpXdot3RemPDLoad
64 30.12.3.1.18k aLldpXdot3RemPD4PID
30.12.3.1.18l aLldpXdot3RemPSEMaxAvailPower
30.12.3.1.18m aLldpXdot3RemPSEAutoclassSupport
30.12.3.1.18n aLldpXdot3RemAutoclassCompleted
30.12.3.1.18o aLldpXdot3RemAutoclassRequest
30.12.3.1.18p aLldpXdot3RemPowerDownRequest
65 30.12.3.1.18q aLldpXdot3RemPowerDownTime
30.12.3.1.18r aLldpXdot3RemMeasVoltageSupport
30.12.3.1.18s aLldpXdot3RemMeasCurrentSupport
30.12.3.1.18t aLldpXdot3RemMeasPowerSupport
30.12.3.1.18u aLldpXdot3RemMeasEnergySupport
66 30.12.3.1.18v aLldpXdot3RemMeasurementSource
30.12.3.1.18w aLldpXdot3RemMeasVoltageRequest
30.12.3.1.18x aLldpXdot3RemMeasCurrentRequest
30.12.3.1.18y aLldpXdot3RemMeasPowerRequest
30.12.3.1.18z aLldpXdot3RemMeasEnergyRequest
67 30.12.3.1.18aa aLldpXdot3RemMeasVoltageValid
30.12.3.1.18ab aLldpXdot3RemMeasCurrentValid
30.12.3.1.18ac aLldpXdot3RemMeasPowerValid
30.12.3.1.18ad aLldpXdot3RemMeasEnergyValid
30.12.3.1.18ae aLldpXdot3RemMeasVoltageUncertainty
30.12.3.1.18af aLldpXdot3RemMeasCurrentUncertainty
68 30.12.3.1.18ag aLldpXdot3RemMeasPowerUncertainty
30.12.3.1.18ah aLldpXdot3RemMeasEnergyUncertainty
30.12.3.1.18ai aLldpXdot3RemVoltageMeasurement
30.12.3.1.18aj aLldpXdot3RemCurrentMeasurement
30.12.3.1.18ak aLldpXdot3RemPowerMeasurement
69 30.12.3.1.18al aLldpXdot3RemEnergyMeasurement
30.12.3.1.18am aLldpXdot3RemPSEPowerPriceIndex
70 33. Data Terminal Equipment (DTE) Power via Media Dependent Interface (MDI) Power over Ethernet over 2 Pairs
33.1 Overview
33.1.1 Objectives
71 33.1.3 Relationship of DTE Power via MDI Power over Ethernet to the IEEE 802.3 Architecture
72 33.2 Power sourcing equipment (PSE)
33.2.1 PSE location
33.2.2 Midspan PSE types
73 33.3 Powered devices (PDs)
33.3.1 PD PI
33.4 Additional electrical specifications
33.4.2 Fault tolerance
33.4.3 Impedance balance
74 33.4.4 Common-mode output voltage
75 33.4.6 Differential noise voltage
33.4.7 Return loss
33.4.9 Midspan PSE device additional requirements
33.4.9.1 “Connector” or “telecom outlet” Midspan PSE device transmission requirements
76 33.4.9.1.1 Near End Crosstalk (NEXT)
77 33.4.9.1.2 Insertion loss
33.4.9.1.3 Return loss
33.4.9.1a 33.4.9.1.4 Work area or equipment cable Cord Midspan PSE
78 33.4.9.1a.1 Maximum link delay
33.4.9.1a.2 Maximum link delay skew
33.4.9.1b Coupling parameters between link segments
79 33.4.9.1b.1 Multiple disturber power sum alien near-end crosstalk (PSANEXT) loss
33.4.9.1b.2 Multiple disturber power sum alien far-end crosstalk (PSAFEXT) loss
33.6 Data Link Layer classification
33.6.3 Power control state diagrams
33.6.3.3 Variables
80 33.8 Protocol implementation conformance statement (PICS) proforma for Clause 33, DTE Power via MDI Power over Ethernet over 2 Pairs
33.8.1 Introduction
33.8.2 Identification
33.8.2.2 Protocol summary
81 33.8.3 PICS proforma tables for DTE Power via MDI Power over Ethernet over 2 Pairs
33.8.3.4 Electrical specifications applicable to the PSE and PD
82 40. Physical Coding Sublayer (PCS), Physical Medium Attachment (PMA) sublayer and baseband medium, type 1000BASE-T
40.6 PMA electrical specifications
40.6.1 PMA-to-MDI interface tests
40.6.1.1 Isolation requirement
83 55. Physical Coding Sublayer (PCS), Physical Medium Attachment (PMA) sublayer and baseband medium, type 10GBASE-T
55.5 PMA electrical specifications
55.5.1 Isolation requirement
84 79. IEEE 802.3 Organizationally Specific Link Layer Discovery Protocol (LLDP) type, length, and value (TLV) information elements
79.1 Overview
79.1.1 IEEE 802.3 LLDP frame format
79.1.1.3 Length/Type field
79.3 IEEE 802.3 Organizationally Specific TLVs
79.3.2 Power Via MDI TLV
86 79.3.2.1 MDI power support
79.3.2.1.1 Port class
79.3.2.1.2 PSE MDI power support
79.3.2.1.3 PSE MDI power state
79.3.2.1.4 PSE pairs control ability
87 79.3.2.2 PSE power pair
79.3.2.3 Power class
88 79.3.2.4 Requested pPower type/source/priority
79.3.2.4.1 Power type
79.3.2.4.2a PD 4PID
89 79.3.2.5 PD requested power value
79.3.2.6 PSE allocated power value
90 79.3.2.6a Dual-signature PD requested power value for Mode A and Mode B
79.3.2.6b PSE allocated power value Alternative A and Alternative B
91 79.3.2.6c Power status
92 79.3.2.6c.1 PSE powering status
79.3.2.6c.2 PD powered status
79.3.2.6c.3 PSE power pairs ext
79.3.2.6c.4 Dual-signature power Class ext Mode A
93 79.3.2.6c.5 Dual-signature power Class ext Mode B
79.3.2.6c.6 Power Class ext
79.3.2.6d System setup
79.3.2.6d.1 Power Type ext
79.3.2.6d.2 PD Load
79.3.2.6e PSE maximum available power value
94 79.3.2.6f Autoclass
79.3.2.6f.1 PSE Autoclass support
79.3.2.6f.2 Autoclass completed
79.3.2.6f.3 Autoclass request
95 79.3.2.6g Power down
79.3.2.6g.1 Power down request
79.3.2.6g.2 Power down time
79.3.8 Power via MDI Measurements TLV
79.3.8.1 Measurements
97 79.3.8.2 PSE power price index
98 79.3.8.3 Power Via MDI Measurements TLV usage rules
79.4 IEEE 802.3 Organizationally Specific TLV selection management
79.4.2 IEEE 802.3 Organizationally Specific TLV/LLDP Local and Remote System group managed object class cross references
102 79.5 Protocol implementation conformance statement (PICS) proforma for IEEE 802.3 Organizationally Specific Link Layer Discovery Protocol (LLDP) type, length, and value (TLV) information elements
79.5.3 Major capabilities/options
103 79.5.8 Power Via MDI TLV
106 79.5.12 Power via MDI Measurements TLV
107 126. Physical Coding Sublayer (PCS), Physical Medium Attachment (PMA) sublayer, and baseband medium, types 2.5GBASE-T and 5GBASE-T
126.5 PMA electrical specifications
126.5.1 Isolation requirement
108 145. Power over Ethernet
145.1 Overview
109 145.1.1 Compatibility considerations
145.1.2 Relationship of Power over Ethernet to the IEEE 802.3 Architecture
110 145.1.3 System parameters
112 145.1.4 Cabling requirements
113 145.2 Power sourcing equipment (PSE)
145.2.1 PSE Type descriptions
114 145.2.2 PSE location
145.2.3 Midspan PSE variants
121 145.2.4 PSE PI
122 145.2.5 PSE state diagrams
145.2.5.1 State diagram overview and timing
123 145.2.5.2 Conventions
124 145.2.5.3 Constants
145.2.5.4 Variables
134 145.2.5.5 Timers
136 145.2.5.6 Functions
141 145.2.5.7 State diagrams
156 145.2.6 PSE detection of PDs
145.2.6.1 PSE detection validation circuit
157 145.2.6.2 Detection probe requirements
158 145.2.6.3 Detection criteria
145.2.6.4 Rejection criteria
159 145.2.6.5 Open circuit criteria
145.2.7 Connection check
145.2.8 PSE classification of PDs and mutual identification
163 145.2.8.1 PSE Multiple-Event Physical Layer classification
166 145.2.8.2 Autoclass (optional)
167 145.2.9 4PID requirements
145.2.10 Power supply output
171 145.2.10.1 Output voltage in the power on states
145.2.10.2 Output voltage pair-to-pair difference
145.2.10.3 Voltage transients
145.2.10.4 Reflected voltage
145.2.10.5 Power feeding ripple and noise
145.2.10.6 Continuous current capability in the power on states
174 145.2.10.6.1 PSE pair-to-pair current unbalance
176 145.2.10.7 Current during power up
178 145.2.10.8 Overload current
145.2.10.9 Short circuit current
181 145.2.10.10 Turn off time
145.2.10.11 Turn off voltage
145.2.10.12 Intra-pair current unbalance
145.2.10.13 Type power
182 145.2.10.14 Power turn on time
145.2.10.15 Error delay timing
145.2.10.16 PSE stability
145.2.11 Power supply allocation
145.2.12 PSE Maintain Power Signature (MPS) requirements
183 145.3 Powered devices (PDs)
184 145.3.1 PD Type descriptions
145.3.2 PD PI
186 145.3.3 PD state diagrams
145.3.3.1 Conventions
145.3.3.2 Mode designation
145.3.3.3 Single-signature PD state diagrams
145.3.3.3.1 Constants
145.3.3.3.2 Variables
189 145.3.3.3.3 Timers
190 145.3.3.3.4 Functions
191 145.3.3.3.5 State diagrams
193 145.3.3.4 Dual-signature PD state diagram
145.3.3.4.1 Constants
145.3.3.4.2 Variables
196 145.3.3.4.3 Timers
145.3.3.4.4 Functions
197 145.3.3.4.5 State diagram
198 145.3.4 PD valid and non-valid detection signatures
200 145.3.5 PD signature configurations
201 145.3.6 PD classification
202 145.3.6.1 PD Multiple-Event class signature
204 145.3.6.1.1 Mark Event behavior
145.3.6.2 Autoclass (optional)
205 145.3.7 PSE Type identification
145.3.8 PD power
208 145.3.8.1 Input voltage
145.3.8.2 Input average power
209 145.3.8.2.1 Input average power exceptions
145.3.8.2.2 System stability test conditions during startup and steady state operation
145.3.8.3 Input inrush current
210 145.3.8.4 Peak operating power
211 145.3.8.4.1 Peak operating power exceptions
145.3.8.5 Input current slew rate
145.3.8.6 PD behavior during transients at the PSE PI
212 145.3.8.7 Ripple and noise
145.3.8.8 Reflected voltage
145.3.8.9 PD pair-to-pair current unbalance
215 145.3.9 PD Maintain Power Signature
217 145.4 Additional electrical specifications
145.4.1 Isolation
145.4.1.1 Electrical isolation environments
218 145.4.1.1.1 Environment A requirements
145.4.1.1.2 Environment B requirements
145.4.2 Fault tolerance
219 145.4.3 Impedance balance
220 145.4.4 Common-mode output voltage
222 145.4.5 Pair-to-pair output noise voltage
145.4.6 Differential noise voltage
223 145.4.7 Return loss
145.4.8 100BASE-TX transformer droop
145.4.9 Midspan PSE device additional requirements
225 145.4.9.1 Connector Midspan PSE device transmission requirements
145.4.9.1.1 Near End Crosstalk (NEXT)
226 145.4.9.1.2 Insertion loss
145.4.9.1.3 Return loss
145.4.9.2 Cord Midspan PSE
227 145.4.9.2.1 Maximum link delay
145.4.9.2.2 Maximum link delay skew
145.4.9.3 Midspan signal path requirements
145.4.9.3.1 Alternative A Midspan PSE signal path transfer function
228 145.4.9.4 Coupling parameters between link segments
145.4.9.4.1 Multiple disturber power sum alien near-end crosstalk (PSANEXT) loss
145.4.9.4.2 Multiple disturber power sum alien far-end crosstalk (PSAFEXT) loss
229 145.5 Data Link Layer classification
145.5.1 TLV frame definition
145.5.2 Data Link Layer classification timing requirements
145.5.3 Power control state diagrams
230 145.5.3.1 Conventions
145.5.3.2 PSE power control state diagrams
145.5.3.2.1 Alternative designation
145.5.3.2.2 Variables
234 145.5.3.2.3 Functions
235 145.5.3.2.4 Attribute to state diagram variable mapping
236 145.5.3.2.5 State diagrams
240 145.5.3.3 Single-signature PD power control state diagrams
145.5.3.3.1 Variables
242 145.5.3.3.2 Timers
145.5.3.3.3 Functions
243 145.5.3.3.4 Attribute to state diagram variable mapping
244 145.5.3.3.5 State diagrams
245 145.5.3.4 Dual-signature PD power control state diagrams
145.5.3.4.1 Mode designation
246 145.5.3.4.2 Variables
248 145.5.3.4.3 Functions
249 145.5.3.4.4 Attribute to state diagram variable mapping
250 145.5.3.4.5 State diagrams
252 145.5.4 Power requests and allocations
145.5.5 State change procedure across a link (single-signature)
253 145.5.5.1 PSE state change procedure across a link (single-signature)
145.5.5.2 PD state change procedure across a link (single-signature)
254 145.5.6 State change procedure across a link (dual-signature)
145.5.6.1 Transitions between 2-pair and 4-pair mode (dual-signature)
255 145.5.6.2 PSE state change procedure across a link (dual-signature)
145.5.6.3 PD state change procedure across a link (dual-signature)
145.5.7 Autoclass
256 145.6 Environmental
145.6.1 General safety
145.6.2 Network safety
145.6.3 Installation and maintenance guidelines
257 145.6.4 Patch panel considerations
145.6.5 Electromagnetic emissions
145.6.6 Temperature and humidity
145.6.7 Labeling
258 145.7 Protocol implementation conformance statement (PICS) proforma for Clause 145, Power over Ethernet
145.7.1 Introduction
145.7.2 Identification
145.7.2.1 Implementation identification
145.7.2.2 Protocol summary
259 145.7.2.3 PD Major capabilities/options
260 145.7.2.4 PSE Major capabilities/options
261 145.7.3 PICS proforma tables for Power over Ethernet
145.7.3.1 Power sourcing equipment
266 145.7.3.2 Powered devices
271 145.7.3.3 Electrical specifications applicable to the PSE and PD
273 145.7.3.4 Electrical specifications applicable to the PSE
275 145.7.3.5 Electrical specifications applicable to the PD
145.7.3.6 Data Link Layer classification requirements
276 145.7.3.7 Environmental specifications applicable to PSEs and PDs
145.7.3.8 Environmental specifications applicable to the PSE
277 Annex A (informative) Bibliography
278 Annex 145A (informative) Resistance and current unbalance
145A.1 Intra pair resistance unbalance
145A.2 Pair-to-pair unbalance overview
280 145A.3 Pair-to-pair link section resistance unbalance requirements for 4-pair operation
145A.4 PSE resistance and current unbalance
281 145A.4.1 Direct RPSE measurement
282 145A.5 PD resistance and current unbalance
283 Annex 145B (informative) Timing diagrams
145B.1 CC_DET_SEQ timing diagrams
145B.1.1 CC_DET_SEQ=0 timing diagrams
284 145B.1.2 CC_DET_SEQ=1 timing diagrams
285 145B.1.3 CC_DET_SEQ=2 timing diagrams
286 145B.1.4 CC_DET_SEQ=3 timing diagrams
287 145B.2 PSE Single-Event Physical Layer classification timing diagram
145B.3 PSE Multiple-Event Physical Layer classification timing diagram
289 Annex 145C (informative) Power system and parameters
145C.1 Constant power
291 145C.2 Current
292 145C.3 Direct current resistance (DCR)
293 145C.4 Bundled cabling applications

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IEEE 8802-3:2021/Amd2-2021
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