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Identification and Specification of Identification and Specification - - PowerPoint PPT Presentation

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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

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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

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ITU-T

Overview

  • Performance of S

ervices and Networks

  • Physical Views of Networks
  • S

ervice Information Flows

  • OSI and G.805 Layers
  • Interesting Time Scales
  • Issues and Questions
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Component Of Is The Basis For Service Performance Support Performance Operability Performance Accessibility Performance Retainability Performance Integrity Performance Security Performance

Service Perform ance verses Netw ork Perform ance

  • A Service Customer focuses on Service Performance

Network Item Dependability Performance Trafficability (Grade of Service) Performance Network Performance Component Of Transmission Performance Planning, Provisioning, and Administration Performance

  • A Service Provider focuses on Service Resources
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View s of Quality of Service

  • 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

Type Of Traffic Engineering QoS Specifications QoS Perceived QoS Desired By Customers Quality of Service (QoS) QoS Delivered QoS Offered By Service Provider

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Physical Netw ork Topology

Collector Ring HUB CO CO CO Metro Network HUB CO HUB CO HUB CO Inter-Office Facilities VIP VIP

Core Network ISP ISP

CO = Central Office DLC = Digital Loop Carrier DSLAM = DSL Access Multiplexer ISP = Internet Service Provider ONU = Optical Network Unit

O N U

xDSL xDSL LAN IP, GbE

Business Access Ring

Access

DSLAM

DLC DLC CO POS ONT ONT

  • PON

ADM

ONT = Optical Network Termination POS = Passive Optical Splitter PON = Passive Optical Network VIP = Video Information Provider

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Dom ains of Applicability

Access Metro Core Layer 3 Layer 2 Physical

Aggregation/Distribution Networks Regional Networks

MSPP = Multi-service Provisioning Platform OADM = Optical Add-drop Multiplexer OXC = Optical Cross-connect RPR = Resilient Packet Ring ULH = Ultra-long Haul

Core Routers MPLS/ATM/FR Core Switches Edge/Aggregation Routers MSPP/RPR Enterprise Access Metro WDM Long Haul DWDM ULH DWDM Core OXC Grooming OXC Residential Access Core OADM Metro/Regional OADM GbE/ATM/MPLS Access Switches

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Typical I P ( and beyond) Encapsulations

IEEE 802.2 LLC PPP AAL5 IEEE 802.2 LLC

ATM HDLC Ethernet MAC RPR MAC

10GbE LAN PHY 10GbE WAN PHY

GFP Optical fibre / G.652, G.653 etc.

GbE PHY RPR PHY

IP SONET / SDH G.709 OCh digital wrapper/ optical channel

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Service Related I nform ation Flow s Service Delivery Network Customer Node 1 Customer Node i Service Node 1 Service Node k Signalling-Control Delivery Network OAM Delivery Network

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Multi-Adm inistrative Dom ain Services

End-to-End Service

Administrative Domain 2 Administrative Domain 3

. . . . . . . . . . . . . . .

Administrative Domain 1 Administrative Domain 4

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Connection Set-Up in Layer 1

Path Layer

Connection Matrix Connection Matrix Connection Matrix

Signaling for given path layer is understood

. . . . . .

Server Layer to Path Layer

Abstract Signaling Interface

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Physical View Of A Linear OTN

ODU OCh/OTU OCh/OTU OTS OMS OMS OMS OTS OTS OTS OTS

OTN Client Signal OTN Client Signal ONE ONE ONE ONE ONE ONE Physical Layer Physical Layer Physical Layer Physical Layer Physical Layer Physical Layer OTS Termination OTS Termination OTS Termination OTS Termination OTS Termination OTS Termination OMS Termination OMS Termination OMS Termination OMS Termination OCh/OTU Termination OCh/OTU Termination OCh/OTU Termination ODU Termination ODU Termination

ONE = Optical Network Element

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I P/ OTN Perform ance

  • Both technologies support unique performance

mechanisms with IP predominately uni-directional and OTN bi-directional.

  • Depending on t he OTN survivability mechanisms,

the IP layer may assume OTN performance to be predictable.

  • Survivability speeds within the OTN may interact

with IP routing convergence.

  • IP routers as ASON clients, may change OTN

performance characteristics, e.g., error rates, bandwidth, and link creation.

  • End-to-end IP client performance will require

consideration of both the IP layer and the OTN layers.

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Signaling w ithin and betw een Layers

Layer 3 Routing / Forwarding

Path Layer Signaling

Layer 1

Client - Server Signaling

Layer 2 Contains Connection Oriented and Connectionless Protocols

Abstract Signaling Interface Abstract Signaling Interface

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Tim e Scales for Typical Events Tens of Milliseconds Tens of Hours

Automatic Protection Switching Capacity Addition Following Major Disruption Automatic Service Restoration Network Resource Optimization Service Customer Addition- Removal

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I ssues and Questions

  • Traditional performance allocation is horizontal, i.e. hypothetical

reference networks. Is a vertical allocation needed?

  • Is there a calculus for aggregating performance metrics across

layers

  • If a capability can be supported at multiple layers, how should

these capabilities be coordinated?

  • Some layer characteristics change with time due to technology
  • advances. Is there a need for a family of layer characterization

templates?

  • Are there a set of principles for allocating performance functions

to layers based on characteristics?

  • Clients can use numerous server layers. Is there a generic inter-

layer signalling model needed?

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Back-Up Slides

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The Optical Transport Netw ork

  • The Optical Transport Network (OTN)
  • 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
  • f client signals
  • It is composed of the following digital layers:
  • Optical Channel Data Unit (ODU), Path and Tandem Connection
  • Optical Channel Transport Unit (OTU)
  • It is composed of the following photonic layers:
  • Optical Channel (OCh) Layer, OCh Reduced (OChr)
  • Optical Mult iplex Section (OMS) Layer
  • Optical Transmission Section (OTS) Layer
  • Optical Physical Section (OPS) Layer
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OTN Survivability Mechanism s

  • The two fundamental survivability mechanisms supported in

the OTN are protection and restoration schemes.

  • Protection schemes are:
  • 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:
  • Reactive and make use of dynamically identified backup,
  • Management system or signalling system based,
  • Require network state information.
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References

  • E.106, Descript ion of an Int ernat ional Emergency

Preference S cheme (IEPS)

  • E.490.1, Overview Of Recommendat ions On Traf f ic

Engineering

  • E.800, Terms And Definit ions Relat ed To Qualit y Of S

ervice And Net work Performance Including Dependabilit y

  • E.801, Framework For S

ervice Qualit y Agreement

  • E.860, Framework For A S

ervice Level Agreement

  • G.709, Net work Node Int erface For The Opt ical

Transport Net work (OTN)

  • G.798, Charact erist ics of Opt ical Transport Net work

Hierarchy Equipment Funct ional Blocks

  • G.805, Generic Funct ional Archit ect ure Of Transport

Net works

  • G.806, Charact erist ics of Transport Equipment -

Descript ion Met hodology and Generic Funct ionalit y

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References

  • G.872, Archit ect ure Of Opt ical Transport Net works
  • G.874, Management Aspect s Of Opt ical Transport

Net work Element s

  • G.959.1, Opt ical Transport Net work Physical Layer

Int erfaces

  • G.7041, Generic Framing Procedure
  • G.7710, Common Equipment Management Funct ion

Requirement s

  • G.7712, Archit ect ure And Specificat ion Of Dat a

Communicat ion Net work

  • G.7713, Dist ribut ed Call and Connect ion Management
  • G.7713.1, Dist ribut ed Call and Connect ion Management

(DCM) Based on PNNI

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  • G.7713.2, DCM Signalling Mechanism Using GMPLS

RSVP-TE

  • G.7713.3, Dist ribut ed Call and Connect ion Management Signalling

Using GMPLS CR-LDP

  • G.8080, Archit ect ure for t he Aut omat ic S

wit ched Opt ical Net work (AS ON)

  • GB 917, S

LA Management Handbook S eries Version 2, TeleManagement Forum

  • M.20, Maint enance Philosophy f or Telecommunicat ions Net works
  • M.3010, Principles For A Telecommunicat ions Management Net work
  • X.700, Management Framework for Open S

yst ems Int erconnect ion (OS I) f or CCITT Applicat ions

  • Y.1271, Framework(s) on Net work Requirement s and Capabilit ies t o

S upport Emergency Communicat ions Over Evolving Circuit S wit ched and Packet S wit ched Net works