ITU-TG.8264/Y.1364 - CSDN文库

ITU-T

需积分: 9 111 浏览量更新于2023-03-16 评论收藏 1.17MB PDF 举报

身份认证购VIP最低享 7 折!

领优惠券(最高得80元）

资源详情

资源评论

资源推荐

International Telecommunication Union

ITU-T

G.8264/Y.1364

TELECOMMUNICATION

STANDARDIZATION SECTOR

OF ITU

(10/2008)

SERIES G: TRANSMISSION SYSTEMS AND MEDIA,

DIGITAL SYSTEMS AND NETWORKS

Packet over Transport aspects – Quality and availability

targets

SERIES Y: GLOBAL INFORMATION

INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS

AND NEXT-GENERATION NETWORKS

Internet protocol aspects – Transport

Distribution of timing information through

packet networks

Recommendation ITU-T G.8264/Y.1364

ii Rec. ITU-T G.8264/Y.1364 (10/2008)

FOREWORD

The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of

telecommunications, information and communication technologies (ICTs). The ITU Telecommunication

Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical,

operating and tariff questions and issuing Recommendations on them with a view to standardizing

telecommunications on a worldwide basis.

The World Telecommunication Standardization Assembly (WTSA), which meets every four years,

establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on

these topics.

The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1.

In some areas of information technology which fall within ITU-T's purview, the necessary standards are

prepared on a collaborative basis with ISO and IEC.

NOTE

In this Recommendation, the expression "Administration" is used for conciseness to indicate both a

telecommunication administration and a recognized operating agency.

Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain

mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the

Recommendation is achieved when all of these mandatory provisions are met. The words "shall" or some

other obligatory language such as "must" and the negative equivalents are used to express requirements. The

use of such words does not suggest that compliance with the Recommendation is required of any party.

INTELLECTUAL PROPERTY RIGHTS

ITU draws attention to the possibility that the practice or implementation of this Recommendation may

involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence,

validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others

outside of the Recommendation development process.

As of the date of approval of this Recommendation, ITU had not received notice of intellectual property,

protected by patents, which may be required to implement this Recommendation. However, implementers

are cautioned that this may not represent the latest information and are therefore strongly urged to consult the

TSB patent database at http://www.itu.int/ITU-T/ipr/

prior written permission of ITU.

Rec. ITU-T G.8264/Y.1364 (10/2008) iii

CONTENTS

Page

1 Scope ............................................................................................................................ 1

2 References..................................................................................................................... 1

3 Definitions .................................................................................................................... 2

3.1 Terms defined elsewhere................................................................................ 2

3.2 Terms defined in this Recommendation......................................................... 2

4 Abbreviations and acronyms ........................................................................................ 3

5 Conventions .................................................................................................................. 4

6 Packet network architectures ........................................................................................ 5

6.1 Network layers and synchronization .............................................................. 5

6.2 Layer network performance impacts on synchronization .............................. 6

7 Timing flows................................................................................................................. 6

8 Functional blocks.......................................................................................................... 7

9 Next generation timing architectures............................................................................ 8

9.1 Current synchronization based on SDH ......................................................... 8

9.2 Synchronization performance......................................................................... 9

9.3 Network evolution.......................................................................................... 9

9.4 Next generation synchronization networks .................................................... 9

10 Frequency transfer using synchronous Ethernet........................................................... 10

10.1 Synchronous Ethernet: General...................................................................... 10

10.2 Operation modes............................................................................................. 11

11 SSM for synchronous Ethernet..................................................................................... 12

11.1 Packet-level SSM ........................................................................................... 12

11.2 Sync selection based on SSM......................................................................... 13

11.3 SSM for synchronous Ethernet: Format and protocol.................................... 13

11.4 ESMC PDU extensions .................................................................................. 16

11.5 Interworking with existing synchronization networks ................................... 16

12 Synchronization management aspects .......................................................................... 16

Annex A – Reference source selection mechanism................................................................. 17

A.1 Requirements.................................................................................................. 17

A.2 Inputs .............................................................................................................. 17

A.3 Internal oscillator............................................................................................ 17

A.4 Internal physical timing flows – Frequency ETY .......................................... 17

A.5 Selection mechanism...................................................................................... 17

A.6 Synchronization status message selection...................................................... 18

A.7 Hybrid equipment selection function ............................................................. 19

Appendix I – Examples of timing flows .................................................................................. 20

剩余35页未读，继续阅读

panbl

粉丝: 0
资源: 16

会员权益专享

ITU-T G.8264/Y.1364

评论0

会员权益专享

最新资源

ITU-T G.8264/Y.1364

评论0

G.8261同步以太网标准

ITU-T G.811

ITU-T G.823

itu-t g.7041/y.1303

itu-t g.165

我没在最新版的ITU-T G.984.3的第8.2.1.3节中找到这段说明，你是参考哪一版的协议，请给出出处

itu-t g.993.2 (vdsl2)

itu-t g.9807. 1

itu-t g.8260

itu-t g.8262

itu-t g.661

在G-PON中，当下行帧指示ONU不发送DBRu时，上行帧中的DBRu域段是全0，还是说删掉了DBRu域段？请依据最新版 ITU-T G.984.3说说

itu-t k.21中文版

请帮忙查找下中国移动光纤标准中能够对应满足 ITU-T 系列光纤标准的规范 ？

itu-tg.984.1中文版

itu-r p.528-4

(itu-tg.709

itu-r s.580-6 中文

itu-r bt.709-6

itu-r m.1036-5

会员权益专享

最新资源

请帮忙查找下中国移动光纤标准中能够对应满足 ITU-T 系列光纤标准的规范？