I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n
ITU-T
G.987.1
TELECOMMUNICATION
STANDARDIZATION SECTOR
OF ITU
(03/2016)
SERIES G: TRANSMISSION SYSTEMS AND MEDIA,
DIGITAL SYSTEMS AND NETWORKS
Digital sections and digital line system – Optical line
systems for local and access networks
10-Gigabit-capable passive optical networks
(XG-PON): General requirements
Recommendation ITU-T G.987.1
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
General
G.900–G.909
Parameters for optical fibre cable systems
G.910–G.919
Digital sections at hierarchical bit rates based on a bit rate of 2048 kbit/s
G.920–G.929
Digital line transmission systems on cable at non-hierarchical bit rates
G.930–G.939
Digital line systems provided by FDM transmission bearers
G.940–G.949
Digital line systems
G.950–G.959
Digital section and digital transmission systems for customer access to ISDN
G.960–G.969
Optical fibre submarine cable systems
G.970–G.979
Optical line systems for local and access networks
G.980–G.989
Metallic access networks
G.990–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
ACCESS NETWORKS
G.9000–G.9999
For further details, please refer to the list of ITU-T Recommendations.
Rec. ITU-T G.987.1 (03/2016) i
Recommendation ITU-T G.987.1
10-Gigabit-capable passive optical networks (XG-PON):
General requirements
Summary
Recommendation ITU-T G.987.1 addresses the general requirements of 10 Gigabit-capable passive
optical network (XG-PON) systems, in order to guide and motivate the physical layer and the
transmission convergence layer specifications. The general requirements include examples of services,
user network interfaces (UNIs) and service node interfaces (SNIs), as well as the principal deployment
configurations that are requested by network operators. This Recommendation also includes the
system and operational requirements to meet the needs of supporting various business and residential
applications.
History
Edition
Recommendation
Approval
Study Group
Unique ID
*
1.0
ITU-T G.987.1
2010-01-13
15
11.1002/1000/10410
1.1
ITU-T G.987.1 (2010) Amd. 1
2012-04-22
15
11.1002/1000/11498
2.0
ITU-T G.987.1
2016-03-29
15
11.1002/1000/12794
Keywords
Asymmetric XG-PON (X=10 Gbit/s), general requirements, TDMA.
____________________
*
To access the Recommendation, type the URL http://handle.itu.int/ in the address field of your web
browser, followed by the Recommendation's unique ID. For example, http://handle.itu.int/11.1002/1000/11
830-en.
ii Rec. ITU-T G.987.1 (03/2016)
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/.
ITU 2016
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.987.1 (03/2016) iii
Table of Contents
Page
1 Scope ............................................................................................................................. 1
2 References ..................................................................................................................... 1
3 Definitions .................................................................................................................... 3
3.1 Terms defined elsewhere ................................................................................ 3
3.2 Terms defined in this Recommendation ......................................................... 3
4 Abbreviations and acronyms ........................................................................................ 3
5 Architecture of the optical access network ................................................................... 3
5.1 Network architecture ...................................................................................... 3
5.2 Reference configuration ................................................................................. 6
6 Migration scenarios ...................................................................................................... 12
6.1 Migration from legacy PON to XG-PON ....................................................... 13
6.2 Migration from XG-PON1 to XG-PON2 ....................................................... 14
6.3 Overlay of XG-PON or hybrid XG-PON ....................................................... 14
6.4 RE architecture options .................................................................................. 14
7 Service requirements .................................................................................................... 15
7.1 Services ........................................................................................................... 15
7.2 Maximum/mean signal transfer delay tolerance ............................................. 16
7.3 Maximum Ethernet packet size ...................................................................... 16
7.4 Synchronization features and quality ............................................................. 17
7.5 Leased line T1/E1 emulation .......................................................................... 17
7.6 QoS and traffic management .......................................................................... 17
8 Physical layer requirements .......................................................................................... 18
8.1 Fibre characteristics ........................................................................................ 18
8.2 Optical wavelengths of XG-PON ................................................................... 18
8.3 Bit rates ........................................................................................................... 18
8.4 Optical power budget ..................................................................................... 19
8.5 Split ratio ........................................................................................................ 19
8.6 Fibre distance .................................................................................................. 20
9 System level requirements ............................................................................................ 20
9.1 Power saving and energy efficiency ............................................................... 20
9.2 Authentication/identification/encryption ........................................................ 21
9.3 Dynamic bandwidth assignment (DBA) ........................................................ 21
9.4 Eye safety ....................................................................................................... 22
10 Operational requirements .............................................................................................. 22
10.1 ONU management .......................................................................................... 22
10.2 PON supervision ............................................................................................. 22
11 Resilience and protection on ODN ............................................................................... 23
