Overview of Q13 recommendations
G.8260
(Definition)
G.8260 AppI
(metrics)
Definitions /
terminology
Basics
Network
requirements
G.8261
Frequency: G.826x
Time/Phase:G.827x
G.8271.1
(Network limits_time/phase
G.8261.1
(NetwkPDV_frequency)
G.8271.2(profile2)
G.8262
(SyncE)
G.8272
PRTC
73.1 GM
G.8263
(slave clock)
G.8273
73.3 TC
73.2 BC
73. x,y,z
G.8264
(SyncE-architecture-SSM)
G.8265
(architecture-Frequency)
Profiles
G.8271
Ongoing
SyncE Jitter-Wander:
(Included in G.8261)
Clock
Methods
Agreed
G.8275
(architecture-time)
G.8265.1
(PTPprofileFrequency)
G.8275.1
(PTPprofile1Time/phase)
G.8265.m
(PTP Profile frequency m)
1
G.8275.2
(PTPprofile2Time/phase )
Geneva, Switzerland, 13 July 2013
G.supp
Summary of the
Synchronization sessions -1
IEEE 1588 Revision
Fix existing problems, remove inconsistancies
Improve accuracy, security, configuration and
MIBs
Layered architecture, but backwards
compatible
Backward compatibility is very important for
operators
IEEE 802.1AS Revision
Additional link types, link aggregation
Redundancy and faster reconfiguration
Architectural convergence with 1588
Geneva, Switzerland,13 July 2013
2
Summary of the
3
Synchronization sessions -2
IEEE Issue One step clock
One-step clock implies the implementation
of hardware that greatly reduces the
processor requirements for synch and
delay processing
Backwards compatibility a requirement
IEEE 1588 simulations for G.827x
802.1AS
&
The proposed G.827x and 802.1AS profiles
will meet their goals
Partial support still to be performed in ITU
Geneva, Switzerland,13 July 2013
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Summary of the
Synchronization sessions -3
Network limits-Asymmetry Asymmetry
remains one of the main issues in the
transport of time. Partial support might
add new sources of asymmetry
 Synchronization
network architecture
Key aspects of NGN synchronization
Packet network infrastructure
New synchronization requirements
New methods
New clock structures
Architecture helps see how all pieces fit together
Geneva, Switzerland,13 July 2013
4
Summary of the
Synchronization sessions - 4
802.1Q Stream reservation protocol
deterministic operation requires that resources
are available
based on 802.1Q Multiple Registration Protocol
talkers advertise the streams that they can
source
Important side-effect sets up a reservation
« domain »
listeners register for streams
New work under way
static reservations, faster startup, big reduction in packet
traffic, support for new shapers, more management
Geneva, Switzerland,13 July 2013
5
Summary of the
Synchronization sessions - 5
802.1Qbv scheduled traffic
Scheduling stream transmission can
greatly reduce delays through switches
Cut-through makes sense
Management of schedule is not a plugand-play operation, it will require
intelligence
Geneva, Switzerland,13 July 2013
6
Summary of the
Synchronization sessions -6
G.8275.x profiles
G.8275.x time PTP telecom profiles
are designed to support the needs
of current and future mobile
technologies
G.8275.1 (full timing suport) will
be finalized soon, G.8275.2 (partial
timing support) is just starting
Geneva, Switzerland,13 July
2013
7