(Continuation of Question 9/15)
Background and justification
Two key technologies are driving the
development of transport equipment and standards:
- The explosive growth of the Internet and other packet based
traffic carried over networks
- The development of OTN provides the ability to dramatically
increase the bandwidth that can be carried over networks
Responsibilities under this Question include the following
areas of standardisation related to these new technologies:
- Specification of all equipment functions and supervision
processes related to the OTN and SDH layer networks
- Specification of Adaptation Functions and Supervision
Processes for transport of packet traffic (e.g., IP, ATM, MPLS)
via the SDH or OTN layer networks
- Specification of survivability capabilities and development
of a strategy for multi-layer survivability interactions
- Examining the impact on synchronization layer functions,
which may differ for transport of different client layers (e.g.,
IP traffic)
Recommendations related to transport technologies (e.g., SDH,
PDH, OTN) used in the access environment and not covered by other
Questions of ITU-T SG 15, such as Flexible Multiplexers, are also
covered by this Question. Responsibility under this Question
includes the following draft or published Recommendations:
G.681: Functional characteristics of interoffice and
long-haul line systems using optical amplifiers, including
optical multiplexing
G.705: Characteristics of Plesiochronous Digital Hierarchy
(PDH) Equipment Functional Blocks
G.781: Synchronisation Layer Functions
G.783: Characteristics of Synchronous Digital Hierarchy (SDH)
Equipment Functional Blocks
G.798: Characteristics of Optical Transport Network (OTN)
Equipment Functional Blocks
G.806: Characteristics of Transport Equipment –
Description Methodology and Generic Functionality
G.841: Types and Characteristics of SDH Network Protection
Architectures
G.842: Interworking of SDH network protection architectures
Question
- What 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 considerations are necessary for equipment optimised for
transport of IP-type traffic?
Study items
Study items to be considered include:
- Completion of equipment Recommendations for the OTN (OTN
equipment in this context relates to equipment functions and the
assembly of optical components and sub-systems)
- Equipment Recommendations to provide enhanced survivability
capabilities and a cohesive strategy for multi-layer
survivability interactions. This includes revisions needed to
Recommendations G.841 and G.842. These Recommendations will
cover SDH and OTN layer protection, as well as multi-layer
survivability, including interactions with protection at packet
layers
- Specifications of Equipment functions necessary to implement
an Automatically Switched Optical Network (ASON)
- 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 to the transport equipment Recommendations in
order to meet the needs of the access network
- Enhancements required to the transport equipment
Recommendations in order to meet the needs of the GII 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
- Clarification and resolution of technical issues in current
and draft Recommendations
Specific tasks
- Revise Recs. G.781, G.841, G.842 as required
- Complete Rec. G.798 by 2001
- Develop additional Recommendations from progress on the above
study points
Relationships
- Other relevant Question of SG 15 on optical networks, digital
hierarchy and management and digital hierarchies
- ITU-T SG 4 on TMN
- ITU-T SG 13 on Transport Network Architectures
- ITU-R SG 4 on Satellite systems
- ITU-T SG7 on aspects related to mapping of IP structured
signals
- ITU-R SG 9 on Radio-relay systems
- IETF
- ATIS Committee T1X1
- ETSI
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