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ITU-T Study Group 15 List of Questions Under Study (Study Period 2005-2008) |
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ITU-T SG 15 Question 9/15 |
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Transport equipment and network protection/restoration
(revised to incorporate responsibility for G.82x Recommendations)
- Motivation
The explosive growth of the Internet and other packet based traffic are the two key drivers for the development
of new transport equipment and network protection and restoration related standards. In addition, the development
of Optical Transport Network (OTN) provides the ability to dramatically increase the bandwidth that can be
carried over networks. Furthermore the advent of the Generic Framing Procedure (GFP, LAPS), Virtual Concatenation (VC)
and the Link Adjustment Scheme (LCAS) is enabling efficient data traffic transport over Synchronous Digital
Hierarchy (SDH) and OTN. This enhanced capability is requiring revision of existing recommendations as well
as developing new recommendations for data equipment such as Ethernet and Multi-Protocol Label Switching (MPLS) equipment.
Responsibilities under this Question include the following areas of standardization related to these new technologies:
- Specification of all equipment functions, supervision and protection switching processes related to the OTN
and SDH layer networks including equipment functions related to access networks such as SDH/DSL, OTN/DSL and
Ethernet/DSL adaptation functions
- Specification of equipment functions, supervision and protection switching processes for transport of
data/packet traffic (e.g., IP, ATM, MPLS, Ethernet, MSR, Storage Area Networks (SAN)) via transport networks
- Specification of survivability capabilities and development of a strategy for multi-layer survivability
interactions (including those where different transport technologies are used at different layers)
- Examining the impact on synchronization layer functions, which may differ for transport of different
client layers (e.g., IP traffic)
- Specification of fundamental transmission parameters and determination of the effect of various
transmission impairments. This includes transmission error and availability performance objectives and allocation
methods for efficient design of digital networks and associated transmission equipment.
Recommendations related to transport technologies (e.g., SDH, PDH, OTN) used in the access environment
and not covered by other Questions of ITU-T SG15, such as Flexible Multiplexers, are also covered by
this Question. The following major Recommendations, in force at the time of approval of this Question, fall
under its responsibility: G.705, G.781, G.783, G.798, G.806, G.841, G.842, G.808.1, G.821, G.826, G.827,
G.828, G.829, G.873.1, G.8021, G.8031, G.8121, G.8201, I.630, X.87/Y.1324, Y.1720.
- Question
- What transport equipment functions must be specified to enable compatible transport equipment in inter-office and long distance networks, including evolution to the optical transport network?
- What additional characteristics of transport equipment should be recommended to provide enhanced survivability capabilities and a cohesive strategy for multi-layer survivability interactions?
- What characteristics should be recommended for equipment for the transport of packet based traffic such as MPLS, Ethernet, MSR, SAN and IP?
- What transmission error performance parameters and objectives need to be recommended
Study items to be considered include, but are not limited to:
- Enhancement and extension of transport equipment Recommendations
- for the SDH and OTN (OTN equipment in this context relates to equipment functions and the assembly of optical components and sub-systems)
- to support the development of CBR transport over packet based networks
- Transport equipment Recommendations to provide enhanced survivability capabilities and a cohesive strategy for multi-layer survivability interactions. This includes revisions to Recommendations G.841, G.842, G.808.x, G.873.x, I.630, X.87/Y.1324, and Y.1720. These Recommendations will cover SDH, OTN, ATM, MPLS, and Ethernet layer protection, multiple services ring based on RPR as well as multi-layer survivability, including interactions with protection at data/packet layers
- Specifications of Equipment functions necessary
- to implement an Automatically Switched Optical Network (ASON)
- for the transport of packet based traffic such as MPLS, Ethernet services, and SAN
- Enhancements to SDH equipment characteristics or network protection protocols to support paths with longer delay times, such as satellite systems, submarine cable systems, radio relay systems or systems with numerous regenerators.
- Enhancements required to the transport equipment Recommendations in order to meet the needs of
- the access network
- the NGN and transport of Internet and other packet based traffic. This includes examining the impact,
if any, on synchronisation layer functions
- Incorporating the impact of recent technological developments into equipment Recommendations such as
Resilient Packet Rings (RPR) (i.e. IEEE 802.17) and multiple services ring based on RPR.
- Clarification and resolution of technical issues in published and draft Recommendations.
- Impact on equipment functions (such as protection switching) due to different characteristics of
satellite networks (e.g., longer delay times).
- Tasks
Tasks include, but are not limited to:
- Complete Recommendation G.808.2 (ex G.gps-2)
- Complete Recommendation G. 873.2 (ex G.otnprot-2)
- Revisions to Recommendation G.798
- To maintain and update, as necessary, the error performance recommendations G.821, G.826, G.827, G.828, G.829 and G.8201.
- Enhancements to Recommendation for equipment for the transport of Ethernet services (G.8021/Y.1341)
- Enhancement to Recommendation for equipment for the transport of MPLS traffic (G.8121/Y.1342 ex G.mplseq)
- Preparation of Recommendation on MPLS survivability functions including shared mesh protection, fast protection and rerouting. Relationships between protection switching and rerouting should be clarified.
- Enhancement to Recommendation on Ethernet protection switching and other survivability techniques (G.8031).
- Enhancements to the multiple services ring based on RPR (X.87/Y.1324), including static and dynamic resource management.
- Develop additional Recommendations from progress on the above study items. Note: An up-to-date status of work under this Question is contained in the
SG15 Work Programme.
- Relationships
- Recommendations:
- G.707, G.709, G.784, G.825, G.826, G.828, G.957, G.959.1, G.7710, G.693, G.8080, G.8010, G.8110, G.8251, G.993.x
- Questions:
- Q5/13, Q3/15, Q4/15, Q6/15, Q11/15, Q12/15, Q13/15 and Q14/15
- Study Groups:
- ITU-T SG4 on TMN and test equipment
- ITU-T SG13 on Ethernet OAM and NGN aspects
- ITU-R SG4 on Satellite systems
- ITU-R SG9 on Radio-relay systems
- Standardization bodies, forums and consortia:
- IETF working group IPORPR on Resilient Packet Rings
- IETF working groups related to Network Management and OAM
- MEF on Ethernet Equipment
- ATIS OPTXS on SONET/SDH
- ETSI TM1 on SDH
- IEEE 802.1, 802.3 on Ethernet Equipment
- IEEE 802.17 on Resilient Packet Rings
- MFA Forum
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