|
ITU-T Study Group 15 List of Questions Under Study (Study Period 2005-2008) |
|
ITU-T SG 15 Question 11/15 |
|
Signal structures, interfaces and interworking for transport networks
(Continuation of Question 11/15 plus part of Question 12/15)
(revised to incorporate part of QC2/17(Q23/15))
- Motivation
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 led to the
development of the second version of Recommendation G.709/Y.1331.
Moreover, new functionalities (LCAS, Virtual concatenation, GFP, LAPS)
that allow for an optimization of the transport of packet data
(ATM, IP, Ethernet) over constant bit-rate technologies (SDH, OTN)
have also been specified and introduced in transport equipment.
A first set of Recommendations addressing Ethernet services and
interfaces has been developed. Further work has to be carried
on the transport of Storage Area Networks (SAN), including Fibre
Channel and Enterprise Systems CONnection (ESCON) flows, and on
the use of existing PDH links for transporting data.
Further study is required regarding interface and encapsulation
issues related to Ethernet and Multi-Protocol Label Switching
(MPLS) transport. Adaptations for packet over packet and circuit
over packet technologies, as well as adaptations related to
connectionless layer networks may also be required.
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 signals
- Ethernet services
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.8011/Y.1307, G.7043/Y.1343,
G.8011.x/G.1307.x, G.8012/Y.1308, G.8040/Y.1340, X.85/Y.1321, X.86/Y.1323.
- Question
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
- to reflect additional transport network applications (e.g. ASON)
and interworking scenarios?
- for networks optimized for transport of packet data, including
packet over packet and circuit over packet adaptations and aspects
related to connectionless layer networks?
- to take transport via satellite networks into account
(e.g., stronger FEC to account for different error rates and error distributions)?
- What should be specified for the definition of new transport networks (including NGN),
while insuring transverse compatibility and interworking
with previously specified technologies?
- Tasks
Tasks include, but are not limited to:
- Maintenance of PDH and SDH Recommendations
- Evolution of GFP, LCAS, and LAPS related Recommendations
- Further development of the OTN NNI Recommendation
- Further development of Ethernet service and interface definitions
- Development of a new Recommendation on MPLS over transport NNI
- Development of a new Recommendation on MSR UNI
- Development of other relevant new Recommendations for packet data transport,
ASON and interworking, new transport networks including NGN,
connectionless layer networks, etc.
Note: An up-to-date status of work under this Question is contained in
the SG 15 Work Programme.
- Relationships
- Recommendations:
- G.783, G.798, G.806, G.872, G.957, G.959.1, G.8010, G.8021
- Questions:
- Q3/15, Q6/15, Q9/15, Q12/15, Q13/15 and Q14/15
- Study Groups:
- ITU-T SG 4 on networks maintenance
- ITU-T SG 13 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
- IEEE 802.17 on Resilient Packet Rings
- ATIS T1X1.5 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
|
|
