Workshop conclusions

1
Workshop conclusions
2
Expected workshop results

• Increased awareness, cooperation delineation of
  standards activities
• Scope of standards
• Confirmation Reassessment
• New topics, areas for standardization
• Revised/new Questions Work Plan
• Prioritization
• Market needs Time lines
• Other action items

3
Workshop conclusions

• Session 1 - IP over Optical, Business H.
  Schink (Siemens) and Market Aspects
• Session 2 - Switched Optical Networks S.
  Trowbridge (Lucent) Summary and Results
• Session 3 - Optics in Access and
  Metropolitan D. Faulkner (BtexaCT)
• Networks-Outcome
• Session 4 - Optical Interfaces A.Mattheus
  (Deut. T.)
• Session 5 - Optical/IP Network OAM
  Protection and Restoration Y.Maeda (NTT)
• Session 6 - WDM and DWDM M.Tomizawa (NTT)

4
Workshop conclusions

• Session 7 - Signalling and Routing A.Le Roux
  (France Telecom)
• Session 8 - Opt. Fibers, Cables
  Components J.Matthews (Corning)
• Session 9 - Optical Network Management K.Lam
  (Lucent)
• Session 10 - Optical Switching Equipment M.Betts
  (Nortel Networks)
• Session 11 - Network Performance (IP/Optical)
  N.Seitz (NTIA)
• Session 12 - Opt. Network Clients
  Services G.Joncour (FranceTelecom)
• Session 13 - Service and Network Evolution
  J-Y.Cochennec (France Telecom)

5
Session 1 IP over Optical, Business and Market
Aspects

• Market window for optical access starts to open
  (will vary by geography), standards need to be
  ready and unambiguous
• Requirements for standards low cost, focussed on
  business aspects of operators, value add for end
  users needs to be understood
• IPv6 provides additional service to end users,
  network performance to be evaluated. Standards
  required for implementation
• Compatibility issues e.g. between FSAN(ATM) and
  EFM(Ethernet) on QoS to be solved
• Telephony needs to be supported, eitehr directly
  or via gateway

6
Session 2 Conclusions and Results

• A strength of ITU-T over many other SDOs is the
  amount of carrier participation. ITU-T solutions
  have been driven by carrier requirements. We must
  continue to encourage continuing and increasing
  participation by carriers in the ITU-T.
• The work to standardize switched transport
  networks is proceeding apace, with many key
  Recommendations already approved. This has been
  facilitated by a sense of urgency on the part of
  participants, new procedures such as AAP to
  increase the speed of ITU-T, and concentrating
  the majority of this work within a single Study
  Group.

7
Session 2 Conclusions and Results (continued)

• Work that had begun independently in different
  SDOs and fora has become more aligned as the
  technology and specifications mature. The
  situation has improved with better communications
  among the organizations and more cross
  participation between ITU-T, IETF, and OIF.
  Appropriate roles for each organization are
  becoming more clear. Participants must continue
  their work to improve alignment between these
  organizations.

8
Session 2 Conclusions and Results (continued)

• As architecture and protocols are being developed
  for switched optical networks, new requirements
  have been identified. It is desirable to capture
  these new requirements in G.807, however care
  must be taken to avoid the need for numerous
  liaisons between SG15 and SG13, or the need for
  SG15 optical control plane experts to regularly
  attend SG13 to keep this work aligned.

9
Session 3 Optics in Access and Metropolitan
Networks-Outcome

• Promote Broadband Passive Optical Networks G983.x
  series of standards
• to increase understanding of business opportunity
• emphasise full-services/triple play
• show application notes with key
  benefits/scenarios/timelines
• In Q.2/15 on optical systems for access networks
• maintain full-services emphasis for GPON
• to differentiate from IEEE802.3ah GEPON with
  Ethernet focus
• P2P started with emphasis on OAM and ODN for
  fibre Ethernet
• liaison sent to Q.3/13 and IEEE802.3ah to avoid
  duplication
• Future - increased service capability, more
  wavelengths and longer reach
• Increase awareness of outside plant issues
• to ensure fibre access systems can be
  realistically deployed

10
Session 4 Optical Interfaces

• Standardization activities with considerable
  market relevance
• ITU-T SG15 Most important SDO for optical
  interfaces (OI)
• ? Optical Interface Recs G.691-G.693, G.959.1,
  G.capp, G.IaDI, etc.
• ? Spectral grids (DWDM, CWDM) Basis of WDM
  interfaces worldwide
• ? Other Recs used as basis/input for OI
  specifications and Recs, e.g.
• Opt. System Design (Sup.dsn) incl. new
  functionalities (e.g. dispersion
• compensation, various line coding, etc.), Fibre
  Recs (G.652-G.655,
• G.scl), Opt. Perform. Monitoring (G.optmon),
  Opt. Safety (G.644)
• IEC Important input for OIs, e.g. physical
  parameter definitions and
• measurement techniques for fibres and opt.
  components, laser safety
• IEEE Ethernet Interfaces (802.3) FE, GE, 10GE,
  (100GE)

SG 15 on track with OI standards activities
11
Session 4 Optical Interfaces (continued)

• Standardization activities (contd)
• OIF Some physical interfaces (e.g. VSR), UNI,
  NNI
• IETF Work on physical layer routing within IPO
  working group
• Multi Source Agreement (10Gig 40Gig
  opto-electrical modules
• for common use in various optical interfaces)
• Other standardization bodies (T1X1, ETSI, etc.)

Continued close cooperation with the various SDOs
required
12
Session 4 Optical Interfaces (continued)

• Interoperability tests different vendors
  NNIs/UNIs in OIF
• ? Results relevant to ITU-T Recommendations
• Optical routing and interface requirements
• ? IETF has started work on physical layer
  routing constraints within
• IPO working group. However, this work has
  slowed down in the
• IETF, and IETF is not in charge of the physical
  layer. On the other
• hand, physical layer constraints must be
  incorporated into routing
• protocols in all-optical networks.
• ? How? Improve cooperation between ITU-T and
  IETF in this area!
• Plans and progress on standardization work in
  ITU-T
• can be found on the ITU-T SG 15 web page.

Interoperability results should be communicated
timely to ITU-T, e.g. via the Liaison officer
between ITU-T and OIF.
13
Session 4 Optical Interfaces (continued)

• How many details shall be standardized in Optical
  Interfaces
• Fully standardized (transverse compatible)
  optical interfaces
• ? are worldwide applicable (large volume ? cost
  reduction, products
• available everywhere, uniform worldwide
  service and maintenance),
• ? have not been defined for more advanced
  set-ups (e.g. for links with
• several optical amplification sections) This
  observation was the
• starting point for G.IaDI.
• Proprietary optical interfaces
• ? have been installed extensively (e.g.
  multi-span WDM links),
• ? benefit significantly from standards Key
  features have been (and will
• be) standardized to enable a successful market
  introduction.
• Example DWDM grid ? basis of all operational
  WDM links.

14
Session 4 Optical Interfaces (continued)

• Prioritization in Optical Interfaces
  standardization work
• Rapid development of OI standards (e.g. 6-12
  months)
• while regarding
• Harmonization of standardization work in various
  SDOs,
• i.e. avoid different standards for the same
  thing.
• Example 10 Gbit/s specs at the physical layer
  for SDH/OTN versus
• IEEE standards (jitter, optical parameters,
  spacing of WDM channels)
• Technical specs (defined in the OI standards)
  shall enable tofabricate low cost OIs. Example
  Recent (very) short reach OIs

International standardization bodies (in
particular ITU-TSG15) will continue to push the
optical interface market
15
Session 5 Optical/IP Network OAM Protection
and Restoration

• Presentations
• OTN Equipment and Deployment in Todays Transport
  Networks (S. Trowbridge, Lucent),
• Network Protection and Restoration (M. Betts,
  Nortel)
• General Principles and Requirements for OAM
  Functions (H. Ohta, NTT)

16
Session 5 Optical/IP Network OAM Protection
and Restoration (continued)

• Important coordination between various Questions
  and other standards
• To avoid duplication of work and for the
  development of consistent standard.
• With Q.3/13, Q.10/13, Q.2/15, Q.12/15, IEEE and
  Metro Ethernet Forum
• It was identified that SG13 studies general
  network principles whereas SG15 studies
  technology specific standards

17
Session 5 Optical/IP Network OAM Protection
and Restoration (continued)

• New topics
• Ethernet on-going study on Ethernet network
  architecture
• with draft Recommendation G.etna in Q12/15
• and OAM functions such as defect detection and
  localization, and performance monitoring in Q3/13

18
Session 6 WDM and DWDM

• Increased awareness, cooperation delineation of
  standards activities
• Cooperation with IEC is very important in this
  area.
• Scope (new topics) of standards
• Anyone can propose to initiate discussions
  regarding,
• Super-DWDM (e.g., less than 12.5GHz spacing)
• Ultra high-speed channel (e.g.,160Gbit/s)
• Distributed/discrete Raman amplification
• Targets
• To provide industries with common terminologies
  and test-methods
• To realize multi-vendor configuration
• Further discussion is needed on compatibility
  issues.

19
Session 6 WDM and DWDM (continued)

• Prioritization
• Raman amplification is categorized as one of
  urgent issues for standardization.
• Safety aspect
• System requirement by using existing fibres
  (splices, connectors, etc.)
• Super-DWDM can be categorized as far future
  issue, but possibly depending on new application
  area.
• Access or metro applications may accelerate the
  needs for this standardization.
• Ultra high-speed channel (160Gbit/s) is far
  future issue.
• Further studies are needed for Optical Time
  Division Multiplexing (OTDM).

20
Session 6 WDM and DWDM (continued)

• Other action items
• Should we limit the variety of implementations in
  order to make the network performance
  predictable?

21
Session 7 - 4 presentations

• 1. Overview on Optical Service and Network
  Architectural Requirements
• 2. Call Connection control Signalling the
  ITU-T SG11 status and perspectives for "New
  Network control Architectures and Protocols
• 3. CR-LDP for ASON Signalling
• 4. GMPLS RSVP-TE for ASON DCM Signalling

22
Session 7 - Presentation 1 Highlights (continued)

• Expected benefits of IP/Optical integration in
  ASON
• 1. Large capacity and economical networks
• 2. Rapid and flexible path provisioning
• 3. New Optical network services
• dynamic pt-pt connexion/BoD
• Various Protection/Restoration mechanisms
• Value-Added services L1(optical)VPN

23
Session 7 - Presentation 2 Highlights (continued)

• SG11 status on Signalling
• 1. Call and Bearer Control separation
• BICC for call control over ATM and IP networks
• 2. More and more separated sig. protocols
• Call, Connection, services resource control
• 3. Start addressing New Network Control
  Architectures and Protocols
• more separated distributed control

24
Session 7 - Presentation 3 Highlights (continued)

• CR-LDP for ASON signalling
• 1. CR-LDP features
• CR-LDP is an extension to LDP, runs over TCP
• Employs the same signalling model as ATM PNNI and
  Q.2931
• Recognized as a method of transporting IP over
  ATM (in Y.1310)
• 2. CR-LDP for ASON in G.7713.3
• Distributed call and connection management
  signalling using GMPLS CR-LDP
• to include Packet-switch capable (PSC),
  Time-division multiplex capable (TDM), Lambda
  switch capable (LSC) and Fiber switch capable
  (FSC) interfaces

25
Session 7 - questions/discussion Highlights
(continued)

• 3 DCM Signalling solutions in G.7713-series
• competing to cover the same requirements?
• How to ensure interworking (especially at E-NNI)
• Ensure alignment with related OIF and IETF
  (GMPLS) efforts
• What means call-connection separation in ASON
• ASON call differs from the legacy definition of a
  call (in SG11)
• relationship between call and connection
  signalling protocols?
• New services
• In what sense is L1(optical)VPN a true
  Virtual private network
• Which U- and C-plane resources can be shared

26
Session 7 - Future directions in the concerned
ITU-T SGs (continued)

• SG15 G.7713 series on ASON DCM.
• Interoperability between DCM signalling solutions
  (part. E-NNI)
• Discovery and Routing protocols
• Separated Call and Connection control (purpose,
  requirements?)
• SG11 Legacy emerging signalling protocols
• BICC-SIP interworking for call control (over ATM
  or IP/Optical?)
• New network control architectures and protocols
• Clarify possible interactions with ASON UNI
• SG13
• L1(optical)VPN service definition and
  requirements
• Shared vs Dedicated resources in C and C planes
  issues

27
Session 7 - Specific Protocol Recommendations for
ASON Distributed Call and Connection Management
(contd)

• G.7713/Y.1704 (12/01)
• Distributed Call/connection Management (DCM)
  requirements and functional model (in conformance
  with G.8080 ASON architecture)
• G.7713.1 PNNI signalling
• G.7713.2 GMPLS RSVP-TE signalling
• G.7713.3 GMPLS CR-LDP signalling

28
Session 8 Optical Fibers, Cables
ComponentsLinkage of Standards Activities

• Reaffirm strong linkage to IEC TC86 - (Working
  Well)
• Emerging linkage to Laser Safety Issues (IEC) and
  high optical power applications
• Continued challenge of balancing architecture and
  physical layer limitations
• New technologies continue to offer new challenges
  and possibilities
• Integrated and smart components, Raman
  Amplification, Broad ? G.scl Fibre

29
Session 8 Optical Fibers, Cables Components
New Topics, areas for standardization (contd)

• gt40 GB/s implications
• Physical media parameters chromatic disp. and PMD
• New methodologies different from worst case
• Integration, Hybridization of Functions
  Components
• Reconfigurable, smart, modular, and low cost
• Packaging and functional integtation
• May need to specify additional parameters beyond
  minimal set to allow integration

30
Session 8 Optical Fibers, Cables Components
New Topics, areas for standardization (contd)

• Enhanced Capabilities with new amplifier
  technologies
• Raman, Extended band for rare earth amplifiers,
  and Semiconductor amplifiers
• Operational signal bands and optical power levels
  continue to expand with new amplification
  technologies

31
Session 8 Optical Fibers, Cables Components
Scope of Current Work New Topics (contd)

• Synergistic relationship to IEC for ITU-T
  applications and associated test methods
• Data / telephony trend - may need better
  communication beyond ITU-T and IEC on Physical
  Layer needs
• New components and technologies may cause
  revisions to Physical Layer Standards to allow
  lower cost implementations

32
Session 8 Optical Fibers, Cables Components
Prioritization of Current Work (contd)

• New Lower cost implementations versus high cost /
  capacity long haul applications
• Operation aspects of systems with high optical
  power levels
• New Components with shorter lifetime, quicker to
  market, more highly integrated
• Need to move beyond worst case system design
• Possible flexibility needed between transverse vs
  longitudinal compatible standardization
• Cost / Value of installation and environmental
  barriers also important for deployment of new
  technologies (IEC SC86A, ITU-T SG6)
• Continued value for definition, terminology

33
Session 9 Optical Network Management

• Discussed the management aspects of OTN
  equipment, in particular on fault management,
  including alarm report control. Several issues
  were noted.
• Also discussed some practical ONM issues from a
  network operator service provider perspective,
  and covered the transport architecture and
  deployment of ON services in particular is the
  concern of migration and integration strategy for
  interworking with the existing management
  environments.
• Presented an overview of service and network
  configuration for Ethernet over WDM. The
  operation architecture and management information
  model from the NE view, Network view, and Service
  view were discussed.

34
Session 9 Optical Network Management (contd)

• Suggested Study Items
• Emergency Telecom Service (ETS) issues Need to
  provide support for Emergency Service per E.106,
  F.706, and Y.roec Special consideration should
  be given to the assignment of alarm severity
  levels Enhanced OTN services such as emergency
  service could be best provided via Service Level
  Agreements.
• New services maintenance issues Need to monitor
  fault isolate concatenated services and ASON
  services Bridge-n-Roll for unprotected
  restored connections in ASON (Re)Grooming in
  ASON
• (see next slide)

35
Session 9 Optical Network Management (contd)

• Proposed Study Items (cont.)
• Management System Integration issues
• New services policy issues Coordinating ASON
  service requests from multiple sources, Use of
  TCM levels with agreed-level enforcement
• Data replication between Management Plane (MP)
  and CP
• Resolution/correlation of multiple Names for a
  resource
• Function allocation between CP and MP
• Partitioning of resource control among CP and MP
  instances
• Interfaces between MP and CP entities
• Harmonization of demands and capacity at each
  transport layer.
• Management information model issues Validate the
  information model with input from independently
  developed implementation and with others, e.g.,
  SG4, IETF.

36
Session 9 Optical Network Management (contd)

• Action Items
• Maintain coordination with SG13 on its work on
  OTN performance recommendations. Result will be
  input to the next version of G.874, which is
  target for consent in 2003.
• Develop work plan on ASON management. Coordinate
  between SG15 SG4 for input.
• Coordination between Q12/15 and Q14/15 on the
  management system integration issues.
• Maintain coordination among SG15, SG4 and IETF on
  transport NE information models. Give report to
  SG4 in its next meeting on the SG15 progress.
• Develop work plan on management aspect of
  Ethernet over transport network based on G.etna.

37
Session 10 Optical Switching Equipment

• Presentations on
• Optical Network Architecture/ASON
• Optical Network control protocols
• Optical crossconnect equipment
• Optical sub systems
• Optical components

38
Session 10 Optical Switching Equipment (contd)

• Evolution of component technology will continue
  to enable new network capabilities e.g.
• Increased optical system reach
• Flexibility at the wavelength and band of
  wavelength level
• New challenges in the areas of
• Performance and fault management
• Connection management

39
Session 10 Optical Switching Equipment (contd)

• Potential need to draw on the experience of SG 11
  on signaling
• Global addressing schemes need to be developed in
  concert with ITU-T SG 2
• Some concern expressed over the potential of
  overlapping activities on components between IEC
  and SG 15

40
Session 11 Network Performance (IP/Optical)

• IP/Optical networks will need to implement QoS
  control mechanisms and coordinate them between
  domains.
• Y.1540/Y.1541 define IP packet transfer QoS
  objectives for a wide range of end user
  applications (including VoIP).
• Needed means of signaling QoS
  requests/responses among networks and relating
  them to QoS mechanisms.
• It will be important to provide flexibility in
  QoS signaling standards and QoS mechanisms but
  not too much!
• Ongoing IP QoS standards work IP network
  availability, packet reordering, priority setup
  for emergency services.

41
Session 11 Network Performance (IP/Optical)
(contd)

• SG13/SG15 should define a performance model for
  OTN/IP client interactions
• SG15 should advise on optical parameters and
  fibre degradation impact on performance --
  recommend values
• SG4 should define allocation of OTN performance
  limits among providers (M.24otn)
• SG11/SG13/SG15 should develop mechanisms for
  dynamically providing assured-quality OTN
  services
• SG4/SG15 should develop procedures for
  restoration and localization of optical network
  failures

42
Session 11 Network Performance (IP/Optical)
(contd)

• ASON based capabilities can influence delivered
  IP performance
• ASON should support service performance levels
  that translate into distinguishable performance
  levels for IP (as well as other clients)
• The ASON signaling protocol policy attributes,
  especially GoS and CoS, should be capable of
  carrying IP performance requirements
• Coordination between SG13 and SG15 is needed to
• Insure ASON performance classes met IP needs
• Establish GoS/CoS component definitions that are
  meaningful for IP
• Determine which performance factors are signaled
  across the UNI and which are in SLAs, e.g.,
  blocking probabilities, dropped call
  probabilities, call priority level, bandwidth
  supported, call set-up time etc.

43
Session 12 Optical Network Clients and Services

• SDH and, more recently, WDM (pre-OTN) transport
  networks are intensively used for carrying
  servicesfrom 1.5 Mbit/s to 2.5 (or 10) Gbit/s
• SDH ? carrier class transport (monitoring,
  protection) ? path capacity not always
  right sized (for data)
• WDM ? higher bit-rates ? variety of
  tributary flows (transparency) ? poor
  performance monitoring (transparency)

44
Session 12 Optical Network Clients and Services
(contd)

• Recently standardized capabilites
• OTN more functionalities for WDM-based networks
• VCAT better granularity of the path
• GFP generic encapsulation for various flows
• LCAS flexible bandwidth allocation
  ( survivability/recovery mechanism)
• ASTN automatic path set-up, protection/restoratio
  n

These newly standardized featuresopen the door
to the delivery of enhanced or new services ?
new business opportunities
45
Session 13 - Service and network evolution

• Creation and deployment of new services on a
  large scale is a clear demand from market, it is
  a major objective of Next Generation Networks
  (NGN), thus NGN standardisation is urgent. (SG
  13 on the way to formalise a ITU-T Project)
• Networks operators and service providers expect
  much from NGN in terms of profit, but NGN
  standardisation may be complicated, because
  regulatory issues come in addition to technical
  issues.
• Definition of open interfaces and interconnection
  capabilities in NGN will be critical issues,
  interoperability with legacy systems is a
  blocking factor for incumbent operators

46
Session 13 - Service and network evolution
(contd)

• The deployment of new broadband services has been
  undertaken by Japan through the ambitious project
  Hikari Hikari is based on a service approach
  (i.e.generalized broadband multimedia
  communication), taking advantage from current
  state of standardisation
• The future growth of multimedia communication has
  motivated Mediacom 2004 ITU-T Project, which has
  already reached maturity, coordination and
  harmonisation of convergence of services is under
  way. However IP transport has not the favor of
  the broadcast community due to its inherent
  limitations (connectionless). How (and where) to
  convince them to adopt generalized IP transport ?