802.3ae标准：迈向10Gbps以太网设计的开发指南

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802.3ae标准是IEEE（Institute of Electrical and Electronics Engineers）在2002年发布的，它是对802.3基础标准的修订，专注于万兆以太网（10 Gigabit Ethernet，10Gbps）的物理层和媒体访问控制（Media Access Control, MAC）规范。该标准旨在支持本地和城域网络（Local and Metropolitan Area Networks, LANs and MANs）之间的高速数据传输，尤其是在采用带有碰撞检测的载波监听多路访问与冲突避免（Carrier Sense Multiple Access with Collision Detection, CSMA/CD）访问方法的环境中。主要内容包括： 1. **物理层规格**：802.3ae定义了10Gbps数据速率下所需的物理层接口和信号规范，如光纤和铜线介质的传输技术、电气特性、线路编码等。它支持多种传输介质，如多模光纤（MMF）和单模光纤（SMF），以及不同的传输距离范围。 2. **MAC参数**：标准详细规定了如何在10Gbps速率下实现有效的MAC层操作，包括帧格式、时序、冲突处理机制以及高带宽下的流量控制策略。这有助于确保在密集网络环境中，数据包能够高效地发送和接收，减少竞争冲突。 3. **管理参数**：802.3ae也提供了管理和监控功能，使得网络管理员可以更好地控制和维护10Gbps以太网设备，包括错误检测、性能统计和配置选项。 4. **标准化进程**：该标准被IEEE Computer Society所赞助，并通过LAN/MAN Standards Committee制定，被美国国家标准协会（American National Standards Institute, ANSI）认可。随着技术的发展，802.3ae可能会被后续的标准取代或更新，因为“Superseded”标识表明它不再是最新的推荐实践，可能包含过时或错误的信息。查阅IEEE-SA Standards Board Operations Manual可以获取关于被取代标准的更多信息。 5. **应用领域**：802.3ae标准适用于需要高速、低延迟通信的应用场景，如数据中心内部连接、云计算中心、金融交易系统以及高级别的企业网络环境，对于实现无缝的千兆到万兆以太网升级具有重要意义。 802.3ae标准是开发万兆以太网设备的关键参考资料，它为工程师们提供了构建高效、可靠、兼容的高速局域网基础设施所需的技术指南。在当今的高速网络环境中，理解和掌握这个标准对于确保网络性能、扩展性和未来兼容性至关重要。

IEEE

CSMA/CD Std 802.3ae-2002

Change the ﬁrst sentence in 1.1.2 to read as follows:

There are two important ways to view local area

network (LAN) design, corresponding to the following:

1.1.2.2 Compatibility interfaces

Change the ﬁrst sentence in 1.1.2.2 to read as follows:

veThe following important compatibility interfaces are deﬁned within what is architecturally the Physical

Layer.

Change item d) in 1.1.2.2 to read as follows:

Gigabit Media Independent Interface (GMII).

The GMII is designed to connect a 1 Gb/s capable

gigabit-capable MAC or repeater unit to a 1 Gb/s gigabit PHY. While conformance with implemen-

tation of this interface is not strictly necessary to ensure communication, it is highly recommended,

since it allows maximum ﬂexibility in intermixing PHYs and DTEs at 1 Gb/s

gigabit speeds. The

GMII is intended for use as a chip-to-chip interface. No mechanical connector is speciﬁed for use

with the GMII. The GMII is optional.

Insert the following lettered items at the end of subclause 1.1.2.2:

10 Gigabit Media Independent Interface (XGMII).

The XGMII is designed to connect a 10 Gb/s

capable MAC to a 10 Gb/s PHY. While conformance with implementation of this interface is not

strictly necessary to ensure communication, it is highly recommended, since it allows maximum

ﬂexibility in intermixing PHYs and DTEs at 10 Gb/s speeds. The XGMII is intended for use as a

chip-to-chip interface. No mechanical connector is speciﬁed for use with the XGMII. The XGMII is

optional.

10 Gigabit

Attachment Unit Interface (XAUI).

The XAUI is designed to extend the connection

between a 10 Gb/s capable MAC and a 10 Gb/s PHY. While conformance with implementation of

this interface is not strictly necessary to ensure communication, it is highly recommended, since it

allows maximum ﬂexibility in intermixing PHYs and DTEs at 10 Gb/s speeds. The XAUI is

intended for use as a chip-to-chip interface. No mechanical connector is speciﬁed for use with the

XAUI. The XAUI is optional.

10 Gigabit Sixteen-Bit Interface (XSBI).

The XSBI is provided as a physical instantiation of the

PMA service interface for 10GBASE-R and 10GBASE-W PHYs. While conformance with

implementation of this interface is not strictly necessary to ensure communication, it is highly rec-

ommended, since it provides a convenient partition between the high-frequency circuitry associated

with the PMA sublayer and the logic functions associated with the PCS and MAC sublayers. The

XSBI is intended for use as a chip-to-chip interface. No mechanical connector is speciﬁed for use

with the XSBI. The XSBI is optional.

1.1.4 Application areas

Change 1.1.4 to read as follows:

The applications en

vironment for the LAN is intended to be commercial and light industrial. Use of CSMA/

CD LANs in home or heavy industrial environments, while not precluded, is not considered within the scope

of this standard.

Use of this standard is not restricted to any speciﬁc environments or applications.

SUPERSEDED

IEEE

Std 802.3ae-2002 AMENDMENT TO IEEE Std 802.3

In the conte

xt of this standard, the term “LAN” is used to indicate all networks that utilize the 802.3 (Ether-

net) protocol for communication. These may include (but are not limited to) LANs and MANs.

1.2.1 State diagram conventions

Change the ﬁfth paragraph in 1.2.1 to read as follows:

Some devices described in this standard (e.g., repeaters) are allowed to have two or more ports. State dia-

grams that are capable of describing the operation of devices with an unspeciﬁed number of ports,

require a

qualiﬁer notation that allows testing for conditions at multiple ports. The notation used is a term that

includes a description in parentheses of which ports must meet the term for the qualiﬁer to be satisﬁed (e.g.,

ANY and ALL). It is also necessary to provide for term-assignment statements that assign a name to a port

that satisﬁes a qualiﬁer. The following convention is used to describe a term-assignment statement that is

associated with a transition:

Add the following subclause after 1.2.4:

1.2.5

Hexadecimal notation

Numerical v

alues designated by the 0x preﬁx indicate a hexadecimal interpretation of the corresponding

number. For example: 0x0F represents an 8-bit hexadecimal value of the decimal number 15; 0x00000000

represents a 32-bit hexadecimal value of the decimal number 0; etc.

1.3 Normative references

Insert the following references in alphabetic order into the reference list in 1.3:

ANSI

T1.105-1995, Telecommunications—Synchronous Optical Network (SONET)—Basic Description

including Multiplex Structure, Rates and Formats.

ANSI T1.269-2000, Information Interchange—Structure and Representation of Trace Message formats for

the North American Telecommunications System.

ANSI T1.416-1999, Telecommunications—Network to Customer Installation Interfaces—Synchronous

Optical Network (SONET) Physical Layer Speciﬁcation: Common Criteria.

ANSI X3.230-1994 (FC-PH), Information Technology—Fibre Channel—Physical and Signaling Interface.

ANSI/TIA/EIA-455-175A-92; Chromatic Dispersion Measurement of Single-Mode Optical Fibers by the

Differential Phase-Shift Method.

ANSI/TIA/EIA-455-203-2001; Launched Power Distribution Measurement Procedure for Graded-Index

Multimode Transmitters.

ANSI/TIA/EIA-455-204-2000; Measurement of Bandwidth on Multimode Fiber.

ANSI/TIA/EIA-526-4A-1997 (OFSTP-4A), Optical Eye Pattern Measurement Procedure.

SUPERSEDED

IEEE

CSMA/CD Std 802.3ae-2002

ANSI/TIA/EIA-568-B.3-2000; Optical Fiber Cabling Components Standard.

EIA/JEDEC Standard EIA/JESD8-6, High Speed Transceiver Logic (HSTL), August 1995.

IEC 60793-1-41: 2001, Optical ﬁbres—Part 1-41: Measurement methods and test procedures—Bandwidth.

IEC 60825-1: 2001, Edition 1.2, Consolidated Edition; Safety of Laser Products—Part 1: Equipment classi-

ﬁcation, requirements and user’s guide.

IEC 61753-1-1: 2000, Fibre optic interconnecting devices and passive components performance standard -

Part 1-1: General and guidance—Interconnecting devices (connectors).

IEC 61753-021-2 (2002-07), Fibre optic passive component performance standard—Part 021-2: Fibre optic

connectors terminated on single-mode ﬁbre to category C Controlled environment.

IEC 61753-022-2, Performance standard—Part 022-2: Fibre optic connectors terminated on multimode ﬁbre

for Category C—Controlled environment.

INCITS-TR-25:1999—Fibre Channel Methodologies for Jitter Speciﬁ

cation.

ITU-T Recommendation G.652, 2000—Characteristics of a single-mode optical ﬁbre cable.

ITU-T Recommendation G.691, 2000—Optical interfaces for single-channel STM-64, STM-256 and other

SDH systems with optical ampliﬁers.

ITU-T Recommendation G.957, 1999—Optical interfaces for equipments and systems relating to the syn-

chronous digital hierarchy (SDH).

ITU-T Recommendation O.150, 1996—General requirements for instrumentation for performance measure-

ments on digital transmission equipment.

ITU-T Recommendation O.172, 1999—Jitter and wander measuring equipment for digital systems which

are based on the synchronous digital hierarchy (SDH).

TIA-492AAAC-2002; Detail Speciﬁcation for 850-nm Laser-Optimized, 50-um core diameter/125-um clad-

ding diameter class Ia graded-index multimode optical ﬁbers.

1.4 Deﬁnitions

Delete deﬁnition 1.4.250. Renumber the deﬁnitions that follow.

1.4.250 side str

eam scrambling

A data scrambling technique, used by 100BASE-T2 to randomize the

sequence of transmitted symbols and avoid the presence of spectral lines in the signal spectrum. Synchroni-

zation of the scrambler and descrambler of connected PHYs is required prior to operation.

EIA publications are available from Global Engineering Documents, 15 Inverness Way East, Englewood, Colorado 80112, USA

(http://global.ihs.com/). JEDEC publications are available from JEDEC, 2001 I Street NW, Washington, DC 20006, USA.

IEC 61753-022-2 is under development and not available at this time. Its anticipated publication date is April 2003. Until the IEC stan-

dard is available, users are encouraged to reference ANSI/TIA/EIA-568-B.3-2000 in its place.

INCITS publications are available from http://www.incits.org.

SUPERSEDED

IEEE

Std 802.3ae-2002 AMENDMENT TO IEEE Std 802.3

Change deﬁnition 1.4.89 to read as follows:

1.4.89 compatibility interfaces:

The Medium Dependent Interf

ace (MDI) cable, the Attachment Unit Inter-

face (AUI) branch cable, and the Media Independent Interface (MII); the three points at which hardware

compatibility is deﬁned to allow connection of independently designed and manufactured components to a

baseband transmission medium. (See IEEE 802.3 Clause 8.) Several hardware points of attachment have

been deﬁned by this standard to allow connection of independently designed and manufactured components

to the transmission medium. See 1.1.2.2.

Insert the following deﬁnitions at the end of 1.4. These deﬁnitions will be renumbered in alphabetic order

in a future edition of this standard, placed in the proper sequence with other deﬁnitions.

1.4.xxx

10 Gigabit Attachment Unit Interface (XAUI):

The interface between two 10 Gigabit Extender

Sublayers (XGXS) to extend the reach of the XGMII for 10 Gb/s operation. (See IEEE 802.3 Clause 47.)

1.4.xxx

10 Gigabit Media Independent Interface (XGMII):

The interface between the Reconciliation

Sublayer (RS) and the Physical Coding Sublayer (PCS) for 10 Gb/s operation. (See IEEE 802.3 Clause 46.)

1.4.xxx

10 Gigabit Sixteen-Bit Interface (XSBI):

The interface between the Physical Coding Sublayer

(PCS) in 10GBASE-R or the WAN Interface Sublayer (WIS) in 10GBASE-W and the Physical Medium

Attachment (PMA) sublayer for 10 Gb/s operation. (See IEEE 802.3 Clause 51.)

1.4.xxx

anomaly:

A discrepanc

y between the actual and desired characteristics of an item. This deﬁnition is

derived from ANSI T1.416-1999 and ANSI T1.105-1995, which take precedence.

1.4.xxx

bit interleaved parity N (BIP-N):

A method of error monitoring using even (or odd) parity, such

that an N-bit codeword is generated over a speciﬁed portion of an input data stream in such a manner that the

i-th bit of the codeword provides even (or odd) parity over the i-th bit of all N-bit sequences in the covered

portion of the data stream. This deﬁnition is derived from ANSI T1.416-1999 and ANSI T1.105-1995, which

take precedence.

1.4.xxx

container:

An SDH term that is equivalent to the payload capacity of a synchronous payload enve-

lope. This deﬁnition is derived from ANSI T1.416-1999 and ANSI T1.105-1995, which take precedence.

1.4.xxx

defect:

A limited interruption in the ability of an item to perform a required function. This deﬁnition

is derived from ANSI T1.416-1999 and ANSI T1.105-1995, which take precedence.

1.4.xxx

fixed stuff:

Null or padding octets inserted to compensate for the bandwidth dif

ferences between the

byte interleaving and the concatenation rules of SONET/SDH. This deﬁnition is derived from ANSI T1.416-

1999 and ANSI T1.105-1995, which take precedence.

1.4.xxx

jitter:

The deviation from the ideal timing of an event at the mean amplitude of the signal popula-

tion. Low-frequency deviations are tracked by the clock recovery circuit, and do not directly affect the tim-

ing allocations within a bit cell. Jitter that is not tracked by the clock recovery circuit directly affects the

timing allocations in a bit cell. Total Jitter (TJ) is composed of Deterministic Jitter (DJ) and Random Jitter

(RJ). Deterministic Jitter is characterized by its bounded peak-to-peak value and a non-Gaussian probability

density function. Four kinds of Deterministic Jitter are identiﬁed by their speciﬁc causes: duty cycle distor-

tion, data dependent, sinusoidal, and uncorrelated (to the data). Random Jitter is characterized by a Gaussian

distribution. For example, Random Jitter is the peak-to-peak value at approximately 14 times the standard

deviation of the Gaussian distribution for a BER of 10E-12, if the jitter population consists of only Gaussian

components.

SUPERSEDED

IEEE

CSMA/CD Std 802.3ae-2002

1.4.xxx

lane:

A bundle of signals that constitutes a logical subset of a point-to-point interconnect. A lane

contains enough signals to communicate a quantum of data and/or control information between the two end-

points.

1.4.xxx Optical Modulation Amplitude (OMA):

The absolute difference between the optical power of a

logic one level and the optical power of a logic zero level.

1.4.xxx pointer:

See Payload pointer.

1.4.xxx payload pointer:

An indicator of the location of the beginning of the synchronous payload enve-

lope. This deﬁnition is derived from ANSI T1.416-1999 and ANSI T1.105-1995, which take precedence.

1.4.xxx RIN

OMA:

Relative Intensity Noise. Laser noise in dB/Hz with XdB optical return loss, with

respect to the optical modulation amplitude.

1.4.xxx

rising edge:

A rising edge for a dif

ferential signal pair, e.g. signal(P,N) is when, signal(P) transitions

from logic low to high and signal(N) transitions from logic high to low.

1.4.xxx

scrambler:

A randomizing mechanism that is used to eliminate long strings of consecutive identical

transmitted symbols and avoid the presence of spectral lines in the signal spectrum without changing the

data rate. A self-synchronous scrambler is one in which the current state of the scrambler is the prior n bits of

the scrambled output. Therefore, the descrambler can acquire the correct state directly from the received

stream. A side-stream scrambler is one in which the current state of the scrambler is dependent only on the

prior state of the scrambler and not on the transmitted data. Therefore, the descrambler must acquire state

either by searching for a state that decodes a known pattern or by agreement to start at a known state in syn-

chronization with the scrambler. A frame-synchronous scrambler is a side-stream scrambler that begins each

frame in a known state. This deﬁnition is derived from ANSI T1.416-1999 and ANSI T1.105-1995, which

take precedence.

1.4.xxx

Synchronous Payload Envelope (SPE):

A 125-microsecond frame structure composed of STS

Path Overhead and bandwidth for payload (payload capacity). The equivalent SDH term is Virtual Container

(VC). This deﬁnition is derived from ANSI T1.416-1999 and ANSI T1.105-1995, which take precedence.

1.4.xxx

WAN Interface Sublayer (WIS):

Within 10GBASE-W, a sublayer used to couple the Physical Cod-

ing Sublayer (PCS) and the Physical Medium Attachment (PMA) sublayer. The WIS contains functions to

perform SONET STS-192c/SDH VC-4-64c framing and scrambling. (See IEEE 802.3 Clause 50.)

1.5 Abbreviations

Insert the following abbreviations in alphabetic order into the abbreviations list in 1.5:

AIS

Alarm Indication Signal

BERT Bit Error Ratio Tester

BIP Bit Interleaved Parity

CDR Clock And Data Recovery Circuit

CID Consecutive Identical Digit

CJPAT Continuous Jitter Test Pattern

CRPAT Continuous Random Test Pattern

DCD Duty Cycle Distortion

DDJ Data Dependent Jitter

DJ Deterministic Jitter

ERDI Enhanced Remote Defect Indication

LCD Loss Of Code-Group Delineation

SUPERSEDED

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