22 June-3 July 2015
ITU-T Study Group 15
Networks, Technologies and Infrastructures for Transport, Access and Home
Study Group 15 Chairman: Stephen Trowbridge
Study Group 15 held its fourth
meeting of the 2013-2016 study period in Geneva from 22 June-3 July 2015,
attended by 282 delegates representing 33 countries.
The meeting received 329
contributions and 456 TDs, a slight decrease from the previous meeting. The
meeting observed the 12-day contribution deadline of revised Recommendation
ITU-T A.1, and nearly all of the contributions to this meeting were submitted
using Direct Document Posting (DDP).
SG15 approved three revised
Recommendations, determined one amendment, and consented 40 texts (five new
Recommendations, eleven revised Recommendations, 18 amendments, and six
corrigenda). Agreement was reached on one amendment, four new Supplements, and
a Technical Paper.
SG15 authorized 15 interim
Rapporteur group meetings to be held prior to the next SG15 plenary, 17 virtual
meetings, and generated 41 liaison statements.
The next plenary meeting of SG15
will be held 15-26 February 2016 in Geneva.
During this meeting, SG15 began
the process of preparing for WTSA-2016, developing initial draft updates of
question texts and updates to the responsibilities and mandates of SG15 as
specified in WTSA Resolution 2.
Executive reports from WP
WP1/15 – Transport aspects
of access, home and smart grid networks
WP1 Chairman: Tom Starr
Q1/15 produced new versions of
the Access Network Transport (ANT) Standards Overview and Work Plan documents.
The Home Network Transport (HNT) Standards Overview and Work Plan document was
revised. The list of CIT activities in other organizations related to
technologies based on Recommendations from WP1/15 was updated. Q1 started work
to improve the practicability of the ANT Standards Overview format by replacing
the manual method with a web-based method.
Q2/15 worked on Passive Optical Networks (PON). Four documents relating to
NGPON2 (ITU-T G.989) and one on WM-PON were prepared for consent and G.sup55
(ex. G.supp.RoF) was prepared for agreement. Two new Recommendation projects
were agreed: G.RoF and a fixed symmetric 10Gb/s PON (G.XGS-PON).
Q4/15 focused on ITU-T G.fast,
VDSL2 and the related PLOAM Recommendations, producing amendments and
corrigenda for consent. A new VDSL2 profile providing higher bit rates was
created. Joint work with Q18/15 produced the new Recommendation ITU-T G.dpm
(ITU-T G.9977 mitigation of interference between DSL and PLC systems) and on
the G.hn Technical Paper.
Q15/15 worked on Smart Grid
Recommendations for consent/determination producing an amendment to ITU-T
G.9903 for consent. A Supplement G.sup57 based on the G.shp6 Draft, and
outgoing liaisons were agreed.
Q18/15 provided three ITU-T G.hn
Recommendations for approval. Amendments and Corrigenda for the ITU-T G.hn
series were prepared for consent and determination. Joint sessions with Q4/15
were held to finalize ITU-T G.9977 (ex. G.dpm) and the G.hn Technical Paper. A
joint session with Q2/15 was held where it was decided to start a new effort on
Visible Light Communication (VLC) systems.
WP2/15 – Optical
technologies and physical infrastructures
WP2 Chairman: Francesco Montalti
Q5/15: The revised
Recommendation ITU-T G.650.2 was consented. Progress was made on the revisions
of ITU-T G.652, ITU-T G.654 and ITU-T G.657. In particular for ITU-T G.652 and
ITU-T G.657 it was agreed to tighten the MFD existing specifications.
The possibility of introducing a
differentiated ITU-T G.652 offering in order to ensure next generation metro,
regional, and long haul networks at higher bit rates and different transmission
strategies such as DPQSK with coherent detection looking to accommodate
economic and technical challenges was discussed. At this time, Q5/15 experts
remain divided on the necessity for including a new category/sub-category, and
plan to continue active discussion on this topic, taking also into account the
view of operators.
Progress was also made on the
revision of ITU-T G.654 for terrestrial applications and it was agreed to
conduct a chromatic dispersion survey following with the discussion on MFD,
cutoff wavelength, and macrobending loss.
Q5 will continue the
correspondence activity on fibre Recommendations ITU-T G.652, ITU-T G.657,
ITU-T G.654 and ITU-T G.650.3 towards a consent at September 2016 SG15 meeting.
The revised Supplement G.Sup.40
and the new Supplement G.Sup.fcr are also expected for agreement at September
2016 SG15 meeting.
Q6/15: Progress was made on the
revision of ITU-T G.959.1, ITU-T G.697, ITU-T G.698.2, ITU-T G.metro, G.Sup39.
The current highest priority of
Q6/15 is to establish sets of parameters and associated values to enable
multi-vendor interoperability for:
The various modulation formats for 40G and 100G application codes
in a revision of ITU-T G.698.2.
Low-cost metro applications on the basis of port-agnostic
endpoints in draft Recommendation ITU-T G.metro.
Q7/15: A base text of the new
Recommendation ITU-T L.fmc, harmonized it with the related IEC standards was
discussed. Correspondence activity will continue in view of consent at
September 2016 meeting.
Regarding the revision of ITU-T
G.671, contributions are invited to enhance the text and parameter definitions
to allow for flexible grid applications and for adding new optical components
that are especially used for optical interfaces using advanced modulation
formats in order to support Q6/15 activities on 40G and 100G application codes.
In respect to ITU-T G.672, contributions with specific text proposals about
enhancements towards flexible grid technology are invited for future meetings.
Further contributions on a
revision of ITU-T G.663 in respect to adding description of XPolM effect are
Q8/15: Progress was made on the
revision of the relevant Recommendations considering 100 G applications. The
highest priority is to revise ITU-T G.973 considering 100 G applications for
submarine systems, which is expected to consent at September 2016 meeting.
The Recommendations ITU-T G.971,
ITU-T G.972 and ITU-T G.979 are expected to consent at September 2016 meeting.
Q16/15: Recommendations ITU-T
L.10, ITU-T L.26 and ITU-T L.43, has been consented. The texts are harmonized
with the relevant IEC normative texts.
Recommendation ITU-T L.59
Amendment 1: “New Appendix IV - Low friction indoor cable and wiring (Japanese
experience)” was agreed.
The activities on the new
Recommendations ITU-T L.oxcon and ITU-T L.pneid and on the revision of
Recommendations ITU-T L.57, ITU-T L.59, ITU-T L.60 and ITU-T L.79 will be
carried out by correspondence.
A.1 justification for proposed
draft new Recommendations ITU-T L.dsa and ITU-T L.cci were prepared;
contributions are expected by correspondence.
Q17/15: New Recommendation ITU-T
L.94 (ex L.gpsm) and revised Recommendation ITU-T L.25 were agreed for consent.
Question 17/15 will prepare
draft for the new Recommendations ITU-T L.nrr-frm and ITU-T L.dm-nrr-mdru
related to disaster management and recovery.
A new work item for
Recommendation ITU-T L.wdc was initiated: contributions are expected by
WP2 issued the Technical Report
“Optical Fibres, Cables and Systems”, as revision of the existing Handbook
A revision of the classification
of the ITU-T L.series Recommendations by technical area instead than
chronologically has been discussed and will be implemented by correspondence.
WP3/15 – Transport network
WP3 Chairman: Ghani Abbas
In fulfilling its Optical
Technology and Optical Transport Network coordination role, WP3/15 updated the
Optical Transport Networks & Technologies (OTNT) Standardization Work Plan.
Considerable progress was made
on a number of transport network technology fronts, including OTN beyond 100G,
SDN for Transport networks, OTN and Ethernet protection, Ethernet OAM and
Equipment specifications for Packet based Transport Networks, transport network
architecture, time and frequency transport, generic and technology-specific
transport equipment management requirements, information models and the
application of SDN to transport networks.
In the area of network
restoration and protection WP3 has revised Recommendations ITU-T G.873.2 “OTN
shared ring protection”, ITU-T G.8032 “Ethernet Ring Protection” and produced a
new Supplement G.suppl.54 where Ethernet linear protection Recommendation ITU-T
G.8031 is applied to PON. WP3 has progressed the work on ODU shared mesh
protection (ODU SMP) and Multi-domain Segmented Protection (MDSP).
In the area of interfaces, OAM
and packet equipment, WP3 has revised Recommendations ITU-T G.8013 “OAM
functions and mechanisms for Ethernet based networks”, ITU-T G.8113.2
“Operations, administration and maintenance mechanisms for MPLS-TP networks
using the tools defined for MPLS” and ITU-T G.8112 “Interfaces for the MPLS
Transport Profile (MPLS-TP) layer network”. Additionally, WP3 has consented a
corrigendum to Recommendation ITU-T G.8021 “Characteristics of Ethernet
Transport Network Equipment Functional Blocks”. WP3 also progressed the work on
Ethernet and MPLS-TP OAM and equipment.
In the area of Optical Transport
Network (OTN), progress was made on B100G where working assumptions and LLs
were updated. Additionally, a Supplement G.suppl.56 “OTN Transport of CPRI
signals” was agreed. A corrigendum to Recommendation ITU-T G.798
“Characteristics of optical transport network hierarchy equipment functional
blocks” was also consented.
Considerable progress was made
on Transport SDN architecture, Common Control Aspects, transport of
Synchronization over OTN, Flexible Ethernet mapping and Flexible OTN
Significant progress was also
made on transport of frequency, time and phase over packet networks, where it
was agreed to consent the following:
Recommendation ITU-T G.8260 “Definitions and terminology for
synchronization in packet networks”
Amendments to Recommendations ITU-T G.8273 “Framework of phase and
time clocks”, and ITU-T G.8273.2 “Timing characteristics of telecom boundary
clocks and telecom time slave clocks”
A corrigendum to ITU-T G.824 “The control of jitter and wander
within digital networks which are based on the 1544 kbit/s hierarchy”
A new work item was initiated
addressing “Synchronization Layer Functions for packet-based networks”.
In the area of Management and
control of transport systems and equipment, the following texts were consented:
New Recommendation ITU-T G.7711 “Generic protocol-neutral
management Information Model for transport resources”
Revision of Recommendation ITU-T G.8051 “Management aspects of the
Ethernet Transport (ET) capable network element ”
Amendments to Recommendation ITU-T G.874” Management aspects of
optical transport network elements”, Recommendation ITU-T G.874.1 “Optical
transport network (OTN): Protocol-neutral management information model for the
network element view” and Recommendation ITU-T G.7712 “Architecture and
specification of data communication network”
Good progress was made on the
management of synchronization, use of SDN for protection and restoration, and
for MPLS-TP the NE Management Requirements and the information model.
The latest SG15 Rapporteur meeting plan is at:
The latest Status of Recommendations is reflected in the Work Programme at: