(Continuation of Part of Question 11/15 studied in 2005-2008)
During the previous Study Period, a great part of the activity of the
Question was dedicated to the definition of the Network Node Interface (NNI) for
the Optical Transport Network (OTN). This work focused on the best means of
transporting packet technology based client signals in an OTN hierarchy. The
work required close interaction with the IETF and the IEEE. Developing new high
speed packet interfaces requires continuing work in this area.
Specifications on new functionalities (LCAS, Virtual concatenation, GFP),
that allow for an optimization of the transport of packet data (ATM, IP,
Ethernet, T-MPLS) over constant bit-rate technologies (SDH, OTN), were enhanced
and revised as implementations matured. Recommendations addressing packet based
services and interfaces continued to be developed. Further work is expected on
the transport of high speed Ethernet and Storage Area Networks (SAN), including
Fibre Channel and Enterprise Systems CONnection (ESCON) flows.
Existing Recommendations may need to be enhanced to take into account new
network features of Automatically Switched Optical Network (ASON).
The area of responsibility under this Question includes the specification of:
- Transport signal structure
- Adaptations of client signals into server transport layers
- Interface characteristics for the transport and supervision of client
The following major Recommendations, in force at the time of approval of this
Question, fall under its responsibility: G.703, G.704, G.707/Y.1322,
G.709/Y.1331, G.7041/Y.1303, G.7042/Y.1305, G.7043/Y.1343, G.8040/Y.1340,
Study items to be considered include, but are not limited to:
- What enhancements should be made to the existing Recommendations or what
new Recommendations should be developed
- what enhancements should be made to the Optical Transport Network (OTN)
hierarchy to accommodate higher speed Ethernet clients?
- to reflect additional transport network applications (e.g. ASON) and
- for networks optimized for transport of packet data, including packet over
packet and circuit over packet adaptations and aspects related to
connectionless layer networks?
- What should be specified for the definition of new transport networks
(including NGN), while insuring transverse compatibility and interworking
with previously specified technologies?
- What enhancements to existing Recommendations are required to provide
energy savings directly or indirectly in Information and Communication
Technologies (ICTs) or in other industries? What enhancements to developing
or new Recommendations are required to provide such energy savings?
Tasks include, but are not limited to:
- Maintenance of PDH, SDH, OTN and LAPS Recommendations
- Evolution of GFP and LCAS related Recommendations
- Further development of the OTN Interface Recommendation
NOTE: An up-to-date status of work under this Question is contained in the
SG15 Work Programme at http://www.itu.int/ITU-T/workprog
- G.783, G.798, G.806, G.872, G.957, G.959.1, G.8010, G.8021, G.8110.1,
- Q3/15, Q6/15, Q9/15, Q10/15, Q12/15, Q13/15, Q14/15, and Q15/15.
- ITU-T SG2 on network maintenance
- ITU-T SG12 on network performance
Standardization bodies, forums and consortia:
- MEF on Ethernet services Issues
- IEEE 802.1 on Ethernet bridges
- IEEE 802.3 on Ethernet transport and high speed Ethernet
- IEEE 802.17 on Resilient Packet Rings
- ATIS OPTXS on SONET/SDH
- T11.3 on SAN flows transport
- IETF ccamp on MPLS extensions
- IETF pppext on IP transport
- IETF mpls on MPLS transport
- IETF PWE3 on packet/circuit over packet