IEEE 802.3at-2009：增强MDI供电能力与数据终端设备升级标准

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802.3at-2009是IEEE（Institute of Electrical and Electronics Engineers）于2009年10月30日发布的一项标准，作为IEEE 802.3系列的一部分，专门针对局域网（LAN）和城域网（MAN）中的数据终端设备（DTE）提供增强的电源通过媒体依赖接口（MDI）的能力。该标准的初衷是为了提升网络设备的功率水平，并改进电源管理信息，支持更高功率的连接，特别是通过平衡电缆为DTE设备供电。 802.3at标准是在IEEE Std 802.3-2008的基础上进行的增补，旨在确保与现有设备的兼容性，同时引入了新的功能。它允许在某些结构化布线系统中提供可选的增强功率限制，以便于更好地管理和控制能源消耗。这一标准的实施对于那些需要高功率需求的设备，如视频监控、VoIP电话和网络视频会议系统等尤为重要。此标准规定了电源通过MDI的传输方法，包括电源的协商、分配以及安全措施，以防止过载和潜在的安全问题。它也包含了电源线的标准规格，例如线缆类型、电压等级和电流承载能力，确保了互操作性和安全性。 IEEE 802.3at-2009标准的文档格式为PDF，共141页，适用于那些需要在标准网络环境中支持大功率应用的工程师和系统设计者。购买价格分为会员和非会员两种，分别为$77.00和$99.00。对于任何想要升级或扩展其网络基础设施，以支持高带宽和高功率设备的组织来说，这是一项重要的技术参考和规范。 802.3at-2009是现代网络设计的关键要素，它不仅提升了网络性能，还优化了设备功耗管理，对于推动绿色IT和高效数据中心运营具有重要意义。了解并遵循这个标准，能够确保网络设备间的无缝连接和电力供应，对于构建可持续的未来网络环境至关重要。

33.5.1.2.4 Power Denied or Removed (12.12) ............................... 82

33.5.1.2.5 Valid Signature (12.11).................................................. 82

33.5.1.2.6 Invalid Signature (12.10) ............................................... 82

33.5.1.2.7 Short Circuit (12.9) ........................................................ 82

33.5.1.2.8 Overload (12.8).............................................................. 82

33.5.1.2.9 MPS Absent (12.7) ........................................................ 82

33.5.1.2.10 PD Class (12.6:4)........................................................... 83

33.5.1.2.11 PSE Status (12.3:1) ........................................................ 83

33.5.1.2.12 Pair Control Ability (12.0)............................................. 83

33.6 Data Link Layer classification............................................................................................... 83

33.6.1 TLV frame definition............................................................................................. 83

33.6.2 Data Link Layer classification timing requirements.............................................. 83

33.6.3 Power control state diagrams................................................................................. 84

33.6.3.1 Conventions ....................................................................................... 84

33.6.3.2 Constants............................................................................................ 84

33.6.3.3 Variables ............................................................................................ 85

33.6.3.4 Functions............................................................................................ 87

33.6.3.5 State diagrams.................................................................................... 88

33.6.4 State change procedure across a link ..................................................................... 89

33.6.4.1 PSE state change procedure across a link.......................................... 90

33.6.4.2 PD state change procedure across a link............................................ 90

33.7 Environmental........................................................................................................................ 91

33.7.1 General safety ........................................................................................................ 91

33.7.2 Network safety....................................................................................................... 91

33.7.3 Installation and maintenance guidelines ................................................................ 91

33.7.4 Patch panel considerations..................................................................................... 91

33.7.5 Telephony voltages ................................................................................................ 91

33.7.6 Electromagnetic emissions .................................................................................... 92

33.7.7 Temperature and humidity..................................................................................... 92

33.7.8 Labeling ................................................................................................................. 92

33.8 Protocol implementation conformance statement (PICS) proforma for Clause 33,

DTE Power via MDI.............................................................................................................. 93

33.8.1 Introduction............................................................................................................ 93

33.8.2 Identification.......................................................................................................... 93

33.8.2.1 Implementation identification............................................................ 93

33.8.2.2 Protocol summary .............................................................................. 93

33.8.2.3 PD Major capabilities/options ........................................................... 94

33.8.2.4 PSE Major capabilities/options.......................................................... 95

33.8.3 PICS proforma tables for DTE Power via MDI .................................................... 96

33.8.3.1 Common device features ................................................................... 96

33.8.3.2 Power sourcing equipment................................................................. 96

33.8.3.3 Powered devices .............................................................................. 101

33.8.3.4 Electrical specifications applicable to the PSE and PD................... 104

33.8.3.5 Electrical specifications applicable to the PSE................................ 105

33.8.3.6 Electrical specifications applicable to the PD.................................. 106

33.8.3.7 Management function requirements ................................................ 107

33.8.3.8 Data Link Layer classification requirements ................................. 110

33.8.3.9 Environmental specifications applicable to PSEs and PDs ............. 111

33.8.3.10 Environmental specifications applicable to the PSE ....................... 111

79. IEEE 802.3 Organizationally Specific Link Layer Discovery Protocol (LLDP) type, length, and

values (TLV) information elements................................................................................................. 113

79.2 Requirements of the IEEE 802.3 Organizationally Specific TLV set ................................. 113

79.3 IEEE 802.3 Organizationally Specific TLVs ...................................................................... 113

79.3.2 Power via MDI TLV............................................................................................ 113

79.3.2.4 Requested power type/source/priority ............................................. 114

79.3.2.4.1 Power type ................................................................... 114

79.3.2.4.2 Power source................................................................ 114

79.3.2.4.3 Power priority .............................................................. 115

79.3.2.5 PD requested power value ............................................................... 115

79.3.2.6 PSE allocated power value .............................................................. 115

79.4 IEEE 802.3 Organizationally Specific TLV selection management ................................... 116

79.4.2 IEEE 802.3 Organizationally Specific TLV/LLDP Local and Remote System

group managed object class cross references ...................................................... 116

79.5 Protocol implementation conformance statement (PICS) proforma for IEEE 802.3

Organizationally Specific Link Layer Discovery Protocol (LLDP) type, length, and values

(TLV) information elements................................................................................................ 118

79.5.6 Power via MDI TLV............................................................................................ 118

Annex A (informative) Bibliography .......................................................................................................... 119

Annex 33A (informative) PSE-PD stability ................................................................................................ 121

33A.1 Recommended PSE design guidelines and test setup.......................................................... 121

33A.2 Recommended PD design guidelines .................................................................................. 123

IEEE Standard for

Information technology—

Telecommunications and information

exchange between systems—

Local and metropolitan area networks—

Specific requirements

Part 3: Carrier Sense Multiple Access with

Collision Detection (CSMA/CD) Access Method

and Physical Layer Specifications

Amendment 3: Data Terminal Equipment (DTE)

Power via the Media Dependent Interface (MDI)

Enhancements

IMPORTANT NOTICE: This standard is not intended to ensure safety, security, health, or

environmental protection in all circumstances. Implementers of the standard are responsible for

determining appropriate safety, security, environmental, and health practices or regulatory requirements.

This IEEE document is made available for use subject to important notices and legal disclaimers. These

notices and disclaimers appear in all publications containing this document and may be found under the

heading “Important Notice” or “Important Notices and Disclaimers Concerning IEEE Documents.”

They can also be obtained on request from IEEE or viewed at http://standards.ieee.org/IPR/

disclaimers.html.

[This amendment is based on IEEE Std 802.3-2008.]

NOTE—The editing instructions contained in this amendment define how to merge the material contained therein into

the existing base standard and its amendments to form the comprehensive standard. When the source of the base text is

other than IEEE Std 802.3-2008, the source is indicated in the change instruction.

The editing instructions are shown in bold italic. Four editing instructions are used: change, delete, insert, andreplace.

Change is used to make corrections in existing text or tables. The editing instruction specifies the location of the change

and describes what is being changed by using strikethrough

(to remove old material) and underscore (to add new mate-

rial). Delete removes existing material. Insert adds new material without disturbing the existingmaterial. Insertions may

require renumbering. If so, renumbering instructions are given in the editing instruction. Replace is used to make

changes in figures or equations by removing the existing figure or equation and replacing it with a new one. Editing

instructions, change markings, and this NOTE will not be carried over into future editions because the changes will be

incorporated into the base standard.

Notes in text, tables, and figures are given for information only and do not contain requirements needed to implement the standard.

IEEE Std 802.3at-2009 AMENDMENT TO IEEE Std 802.3-2008: CSMA/CD

1. Introduction

1.3 Normative references

Insert the following new references in alphanumerical order:

ANSI/TIA-568-C.0—Generic Telecommunications Cabling.

ANSI/TIA-568-C.2—Copper Cabling Components.

1.4 Definitions

Insert the following definitions alphabetically and renumber as required:

1.4.x 1-Event class signature: The response of the PD to 1-Event classification (see IEEE 802.3,

Clause 33).

1.4.x 1-Event classification: The application of a single class event during PI probing (see IEEE 802.3,

Clause 33, 33.2.6).

1.4.x 2-Event class signature: The response of the PD to 2-Event classification (see IEEE 802.3,

Clause 33).

1.4.x 2-Event classification: The application of two class events during PI probing (see IEEE 802.3,

Clause 33, 33.2.6).

1.4.x I

Port

: The total power-pair current going into the PI (see IEEE 802.3, Clause 33).

1.4.x Midspan PSE, 1000BASE-T: A Midspan PSE that results in a link that can support 10BASE-T,

100BASE-TX, and 1000BASE-T operation (see IEEE 802.3, Clause 33).

1.4.x Midspan PSE, 10BASE-T/100BASE-TX: A Midspan PSE that results in a link that can only support

10BASE-T and 100BASE-TX operation (see IEEE 802.3, Clause 33).

1.4.x TP-PMD: Twisted Pair, Physical Medium Dependent (ANSI X3.263-1995).

1.4.x Type 1 PD: A PD that does not provide a Class 4 signature during Physical Layer classification (see

IEEE 802.3, Clause 33).

1.4.x Type 1 PSE: A PSE that supports only a Type 1 PD (see IEEE 802.3, Clause 33).

1.4.x Type 2 PD: A PD that provides a Class 4 signature during Physical Layer classification, understands

2-Event classification, and is capable of Data Link Layer classification (see IEEE 802.3, Clause 33).

1.4.x Type 2 PSE: A PSE that supports both a Type 1 and a Type 2 PD (see IEEE 802.3, Clause 33).

1.4.x V

: The voltage at the PD PI measured between any conductor of one power pair and any conductor

of the other power pair (see IEEE 802.3, Clause 33).

1.4.x V

PSE

: The voltage at the PSE PI measured between any conductor of one power pair and any

conductor of the other power pair (see IEEE 802.3, Clause 33).

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