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ITU-T G.8262/Y.1362
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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
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International Telecommunication Union
ITU-T
G.8262/Y.1362
TELECOMMUNICATION
STANDARDIZATION SECTOR
OF ITU
(07/2010)
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
Timing characteristics of a synchronous
Ethernet equipment slave clock
Recommendation ITU-T G.8262/Y.1362
ITU-T G-SERIES RECOMMENDATIONS
TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS
INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100–G.199
GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-
TRANSMISSION SYSTEMS
G.200–G.299
INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE
SYSTEMS ON METALLIC LINES
G.300–G.399
GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS
ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC
LINES
G.400–G.449
COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450–G.499
TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600–G.699
DIGITAL TERMINAL EQUIPMENTS G.700–G.799
DIGITAL NETWORKS G.800–G.899
DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900–G.999
MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE – GENERIC AND USER-
RELATED ASPECTS
G.1000–G.1999
TRANSMISSION MEDIA CHARACTERISTICS G.6000–G.6999
DATA OVER TRANSPORT – GENERIC ASPECTS G.7000–G.7999
PACKET OVER TRANSPORT ASPECTS G.8000–G.8999
Ethernet over Transport aspects G.8000–G.8099
MPLS over Transport aspects G.8100–G.8199
Qualit
y
and availabilit
y
tar
g
ets G.8200–G.8299
Service Management G.8600–G.8699
ACCESS NETWORKS G.9000–G.9999
For further details, please refer to the list of ITU-T Recommendations.
Rec. ITU-T G.8262/Y.1362 (07/2010) i
Recommendation ITU-T G.8262/Y.1362
Timing characteristics of a synchronous Ethernet equipment slave clock
Summary
Recommendation ITU-T G.8262/Y.1362 outlines requirements for timing devices used in
synchronizing network equipment that uses synchronous Ethernet. This Recommendation defines the
requirements for clocks, e.g., bandwidth, frequency accuracy, holdover and noise generation.
History
Edition Recommendation Approval Study Group
1.0 ITU-T G.8262/Y.1362 2007-08-13 15
1.1 ITU-T G.8262/Y.1362 (2007) Amend. 1 2008-04-29 15
1.2 ITU-T G.8262/Y.1362 (2007) Amend.2 2010-01-13 15
2.0 ITU-T G.8262/Y.1362 2010-07-29 15
Keywords
Clock, jitter, synchronization, wander.
ii Rec. ITU-T G.8262/Y.1362 (07/2010)
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 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/
.
ITU 2010
All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the
prior written permission of ITU.
Rec. ITU-T G.8262/Y.1362 (07/2010) iii
CONTENTS
Page
1 Scope ............................................................................................................................ 1
2 References..................................................................................................................... 1
3 Definitions .................................................................................................................... 2
4 Abbreviations and acronyms ........................................................................................ 2
5 Conventions .................................................................................................................. 3
6 Frequency accuracy ...................................................................................................... 3
6.1 EEC-Option 1 ................................................................................................. 3
6.2 EEC-Option 2 ................................................................................................. 3
7 Pull-in, hold-in, and pull-out ranges ............................................................................. 3
7.1 Pull-in range ................................................................................................... 3
7.2 Hold-in range .................................................................................................. 4
7.3 Pull-out range ................................................................................................. 4
8 Noise generation ........................................................................................................... 4
8.1 Wander in locked mode .................................................................................. 4
8.2 Non-locked wander ........................................................................................ 7
8.3 Jitter ................................................................................................................ 7
9 Noise tolerance ............................................................................................................. 8
9.1 Wander tolerance ............................................................................................ 9
9.2 Jitter tolerance ................................................................................................ 11
10 Noise transfer ................................................................................................................ 13
10.1 EEC-Option 1 ................................................................................................. 14
10.2 EEC-Option 2 ................................................................................................. 14
11 Transient response and holdover performance ............................................................. 15
11.1 Short-term phase transient response ............................................................... 15
11.2 Long-term phase transient response (Holdover) ............................................ 16
11.3 Phase response to input signal interruptions .................................................. 18
11.4 Phase discontinuity ......................................................................................... 18
12 Interfaces....................................................................................................................... 19
12.1 External synchronization interfaces ............................................................... 19
Appendix I – Hybrid network elements (NEs) using STM-N and Ethernet (ETY)
interfaces ....................................................................................................................... 21
Appendix II – Relationship between requirements contained in this Recommendation and
other key synchronization-related Recommendations .................................................. 22
Appendix III – List of Ethernet interfaces applicable to synchronous Ethernet ...................... 23
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