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Question 10/15

Question 10/15 - Interfaces, Interworking, OAM and Equipment specifications for Packet based Transport Networks
(Continuation of Q10/15 and part of Q9/15)
The explosive growth of the Internet, the standardisation of 40 and 100Gbit/s Ethernet, the anticipated standardisation of Ethernet rates greater than 100 Gbit/s, and other packet based traffic are the key drivers for the development of new transport equipment related standards. This enhanced capability results in a need for the revision of existing recommendations as well as the development of new recommendations for Packet-based transport equipment.
Other functional enhancements such as multicast and broadcast must also be developed. In order to ensure these new transport networks achieve carrier-class performance.
Operation, Administration and Maintenance (OAM) capabilities are essential for all network technologies when developing a carrier-class network. It is also particularly true when developing a Transport Network because a Transport Network is expected to support a wide variety of services in terms of reliability and performance including highly reliable and high quality services, which require effective network management.
Under the responsibility of this Question, Recommendations will be developed to provide the specifications for packet based Equipment, OAM mechanisms, Network Interfaces, Services and interworking in Transport Networks. This activity will be conducted in close co-operation with related Study Groups, IEEE, Metro Ethernet Forum, IETF and other SDOs as necessary.
Existing Recommendations may need to be enhanced to take into account new Transport Network features of Automatically Switched Optical Network (ASON) or other network management capabilities
The area of responsibility under this Question includes the specification of:
  • Specification of all equipment functions related to the packet layer networks including equipment functions related to access networks such as Ethernet/DSL adaptation functions
  • Specification of equipment functions for transport of data/packet traffic (e.g., Ethernet, IP, ATM, MPLS, MPLS-TP, other packet-based transport technologies, Storage Area Networks (SAN))
  • Investigation of power saving mechanisms for transport network equipment in the wider context of ICTs (Information and Communications Technologies).
  • Packet Transport OAM structures and methods
  • Network Interface characteristics for the Packet Transport Network
  • Packet data transport supervision
  • Ethernet services
Recommendations related to Packet Transport technologies used in the access environment and not covered by other Questions of ITU-T SG15, 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.8011/Y.1307, G.8011.x/Y.1307.x, G.8012/Y.1308, G.8012.1/Y.1308.1, G.8112/Y.1371, G.8013/Y.1731, G.8113.1, G.8113.2, G.8021/Y.1341, G.8021.1/Y.1341.1, G.8121/Y.1381, G.8121.x/G.1381.x, G.,Sup4, I.610, Y.1710, Y.1711, Y.1712, Y.1713, Y.1714 and Y.1730.
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 characteristics should be recommended for equipment for the transport of packet based traffic such as Ethernet, MPLS-TP, MPLS, other packet-based transport technologies, 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:Specifications of Equipment functions necessary for the transport of packet based traffic such as Ethernet services, MPLS-TP, and SAN
  • 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.
  • Clarification and resolution of technical issues in published and draft Recommendations.
  • What transport equipment functions should be specified to allow power savings within transport networks?
  • Clarification of requirements and mechanisms of OAM for Packet Transport Networks. This includes study on end-to-end OAM support for packet based ubiquitous networks. The OAM functions provide the capability for defect detection, defect localization, topology management and performance management. OAM functions should be able to be applied to point-to-point, point-to-multipoint and multipoint-to-multipoint networks.
  • Clarification of generic OAM principles for connection-oriented circuit-switched, connection-oriented packet-switched and connectionless packet switched networks.
  • Clarification of generic OAM principles under interworking of different network technologies. This includes network interworking and service interworking scenarios.
  • Continue work on the transport Ethernet OAM Recommendation Y.1731 in cooperation with IEEE
  • Continue work on the MPLS-TP OAM Recommendations in cooperation with IETF
  • Continue work on the Ethernet services and Network Interfaces Recommendations with MEF
Tasks include, but are not limited to:
  • Enhancement and improvement of existing Recommendation on characteristics of packet-based transport network equipment functional blocks (G.8021.x/Y.1341.x, G.8121.x/Y.1381.x)
  • Enhancement to relevant Recommendations to include broadcast and multicast functionality
  • Enhancements to existing Recommendations on OAM mechanisms for Transport Networks. (G.8013/Y.1731, G.8113.x/Y.1371.x)
  • Preparation of new Recommendations on OAM mechanisms including defect localization functions and performance measurement functions.
  • Preparation of Recommendation on OAM functions that accommodate interworking of different network technologies.
  • Further development of Packet Transport Network service definitions (G.8011.x/Y.1307.x)
  • Further development of Packet Transport Network interface specifications (G.8012.x/Y.1308.x, G.8112/Y.1371)
NOTE: An up-to-date status of work under this Question is contained in the SG15 Work Programme at
  • G.806, G.872, G.8001, G.8010, G.8051, G.8101, G.8110.1, G.7710,
  • Q3/15, Q4/15, Q9/15, Q11/15, Q12/15, Q13/15, Q14/15
  • Q17/12
Study Groups:
  • ITU-T SG2 responsible for telecommunication management
  • ITU-R SG9 responsible for Radio-relay systems
  • ITU-T SG12 responsible for Ethernet and MPLS error performance
  • ITU-T SG13 responsible for NGN aspects
Standardization bodies, forums and consortia:
  • MEF on Ethernet services Issues
  • IEEE 802.1 on Ethernet bridges
  • IEEE 802.3 on Ethernet transport
  • IETF ccamp on MPLS extensions
  • IETF mpls on MPLS transport
  • IETF pwe3 on PW transport
  • Broadband Forum