Identification and Specification of Identification and Specification - PowerPoint PPT Presentation

I nternational Telecom m unication Union ITU-T Identification and Specification of Identification and Specification of NGN Service and Control NGN Service and Control Requirements Requirements Tobey Trygar Telcordia Technologies I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6

Overview ITU-T o Performance of S ervices and Networks o Physical Views of Networks o S ervice Information Flows o OSI and G.805 Layers o Interesting Time Scales o Issues and Questions I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 2

Service Perform ance verses Netw ork Perform ance ITU-T o A Service Provider focuses on Service Resources o A Service Customer focuses on Service Performance Security Support Operability Accessibility Retainability Integrity Performance Performance Performance Performance Performance Performance Component Of Service Performance Is The Basis For Network Performance Component Of Planning, Provisioning, Trafficability Network Item Transmission and Administration Dependability (Grade of Service) Performance Performance Performance Performance I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 3

View s of Quality of Service ITU-T o QoS is the degree of conformance of the service delivered to a user by a provider in accordance with an agreement, e.g., an S LA Quality of Service (QoS) Type Of Traffic Engineering QoS Perceived QoS Delivered QoS Specifications QoS Offered By QoS Desired By Service Provider Customers I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 4

Physical Netw ork Topology ITU-T Core Network HUB CO VIP VIP HUB HUB Metro Network CO CO ISP HUB ISP CO CO = Central Office DLC = Digital Loop Carrier DSLAM = DSL Access Multiplexer Collector CO CO ISP = Internet Service Provider Ring Inter-Office Facilities ONU = Optical Network Unit CO O Business Access DLC N Access xDSL Ring DLC U ADM DSLAM POS xDSL IP, GbE ONT = Optical Network Termination PON POS = Passive Optical Splitter ONT ••• ONT PON = Passive Optical Network LAN VIP = Video Information Provider I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 5

Dom ains of Applicability ITU-T Metro Core Access Edge/Aggregation Core Routers Layer 3 Routers MPLS/ATM/FR GbE/ATM/MPLS Core Switches Layer 2 Access Switches MSPP/RPR Grooming Core OXC OXC Metro/Regional Core OADM OADM Physical Residential Enterprise Long Haul ULH Metro WDM Access Access DWDM DWDM Aggregation/Distribution Regional Networks Networks MSPP = Multi-service Provisioning Platform RPR = Resilient Packet Ring OADM = Optical Add-drop Multiplexer ULH = Ultra-long Haul OXC = Optical Cross-connect I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 6

Typical I P ( and beyond) Encapsulations ITU-T IP IEEE 802.2 LLC IEEE 802.2 LLC PPP AAL5 RPR MAC Ethernet MAC HDLC ATM RPR PHY 10GbE GbE 10GbE WAN PHY PHY LAN PHY GFP SONET / SDH G.709 OCh digital wrapper/ optical channel Optical fibre / G.652, G.653 etc. I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 7

Service Related I nform ation Flow s ITU-T OAM Delivery Network Signalling-Control Delivery Network Service Delivery Network Service Service Customer Customer Node 1 Node k Node 1 Node i I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 8

Multi-Adm inistrative Dom ain Services ITU-T End-to-End Service Administrative . . . . . . Domain 2 Administrative Administrative . . . Domain 1 Domain 4 . . . . . . Administrative Domain 3 I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 9

Connection Set-Up in Layer 1 ITU-T Signaling for given path layer is understood . Connection . . Connection Matrix . . Connection Matrix . Matrix Path Layer Abstract Signaling Interface Server Layer to Path Layer I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 0

Physical View Of A Linear OTN ITU-T OTN Client Signal OTN Client Signal ODU ODU ODU Termination Termination OCh/OTU OCh/OTU OCh/OTU OCh/OTU OCh/OTU Termination Termination Termination OMS OMS OMS OMS OMS OMS OMS Termination Termination Termination Termination OTS OTS OTS OTS OTS OTS OTS OTS OTS OTS OTS Termination Termination Termination Termination Termination Termination Physical Physical Physical Physical Physical Physical Layer Layer Layer Layer Layer Layer ONE ONE ONE ONE ONE ONE ONE = Optical Network Element I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 1

I P/ OTN Perform ance ITU-T o Both technologies support unique performance mechanisms with IP predominately uni-directional and OTN bi-directional. o Depending on t he OTN survivability mechanisms, the IP layer may assume OTN performance to be predictable. o Survivability speeds within the OTN may interact with IP routing convergence. o IP routers as ASON clients, may change OTN performance characteristics, e.g., error rates, bandwidth, and link creation. o End-to-end IP client performance will require consideration of both the IP layer and the OTN layers. I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 2

Signaling w ithin and betw een Layers ITU-T Routing / Forwarding Layer 3 Abstract Signaling Interface Layer 2 Contains Connection Oriented and Connectionless Protocols Abstract Signaling Interface Path Layer Signaling Layer 1 Client - Server Signaling I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 3

Tim e Scales for Typical Events ITU-T Automatic Service Service Customer Restoration Addition- Removal Automatic Network Capacity Addition Protection Resource Following Major Switching Optimization Disruption Tens of Tens of Milliseconds Hours I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 4

I ssues and Questions ITU-T Traditional performance allocation is horizontal, i.e. hypothetical o reference networks. Is a vertical allocation needed? Is there a calculus for aggregating performance metrics across o layers If a capability can be supported at multiple layers, how should o these capabilities be coordinated? Some layer characteristics change with time due to technology o advances. Is there a need for a family of layer characterization templates? Are there a set of principles for allocating performance functions o to layers based on characteristics? Clients can use numerous server layers. Is there a generic inter- o layer signalling model needed? I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 5

Back-Up Slides ITU-T I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 6

The Optical Transport Netw ork ITU-T The Optical Transport Network (OTN) o • Is specified primarily in G.872, G.709, G.798, G.959.1, and G.874, • Is current ly limit ed to the transport of digital signals • Provides transport, multiplexing, routing, supervision and survivability of client signals It is composed of the following digital layers: o • Optical Channel Data Unit (ODU), Path and Tandem Connection • Optical Channel Transport Unit (OTU) It is composed of the following photonic layers: o • Optical Channel (OCh) Layer, OCh Reduced (OChr) • Optical Mult iplex Section (OMS) Layer • Optical Transmission Section (OTS) Layer • Optical Physical Section (OPS) Layer I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 7

OTN Survivability Mechanism s ITU-T The two fundamental survivability mechanisms supported in o the OTN are protection and restoration schemes. Protection schemes are: o • Autonomous and make use of pre-established backup resources • Optical Multiplex S ection (OMS ) resilience - all channels in a fiber (or fiber bundle) protected as a whole, • Optical Channel (OCh) resilience - each optical channel is protected individually. Restoration schemes are: o • Reactive and make use of dynamically identified backup, • Management system or signalling system based, • Require network state information. I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 8

References ITU-T E.106, Descript ion of an Int ernat ional Emergency o Preference S cheme (IEPS) E.490.1, Overview Of Recommendat ions On Traf f ic o Engineering E.800, Terms And Definit ions Relat ed To Qualit y Of S ervice o And Net work Performance Including Dependabilit y E.801, Framework For S ervice Qualit y Agreement o E.860, Framework For A S ervice Level Agreement o G.709, Net work Node Int erface For The Opt ical o Transport Net work (OTN) G.798, Charact erist ics of Opt ical Transport Net work o Hierarchy Equipment Funct ional Blocks G.805, Generic Funct ional Archit ect ure Of Transport o Net works G.806, Charact erist ics of Transport Equipment - o Descript ion Met hodology and Generic Funct ionalit y I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 9