workshop ip/optical; chitose, japan; 9-11 july 2002 otn equipment and deployment in today’s...

Workshop IP/Optical; Chitose, Japan; 9-11 July 2002Workshop IP/Optical; Chitose, Japan; 9-11 July 2002

OTN Equipment and Deployment in OTN Equipment and Deployment in Today’s Transport NetworksToday’s Transport Networks

Session 5 Session 5 Dr. Ghani AbbasDr. Ghani Abbas Q9/15 RapporteurQ9/15 Rapporteur

Dr. Stephen TrowbridgeDr. Stephen Trowbridge Chairman WP 3/15Chairman WP 3/15

10/7/200210/7/2002


TopicsTopics

• Today’s Transport Networks

• Types of OTN Equipment

• Interworking with other transport networks

• ITU Recommendations


Today’s Transport NetworksToday’s Transport Networks

• Metro Access• SDH metro ring applications

• Multi-Service Provisioning Nodes - combining data and SDH

• Metro Core

• SDH ADM metro ring and mesh application

• Optical add/drop multiplexers (proprietary)

• Long Haul/Ultra Long haul

• SDH ADM rings and line systems

• DWDM line systems (proprietary)


OTN RequirementsOTN Requirements

• Functionality as that offered by SDH or better• Transparent transport of SDH and other payloads• Stronger FEC

G.709 is the answer G.709 defines the interfaces for the OTN


Applicability of SDH and OTN StandardsApplicability of SDH and OTN Standards

SONET and SDH technology evolved with fully SONET and SDH technology evolved with fully standardized external interfaces.standardized external interfaces.

While many of the features of Optical Transport Networks While many of the features of Optical Transport Networks (OTNs) are standardized, many of the external interfaces (OTNs) are standardized, many of the external interfaces are highly proprietary, trying to maximize:are highly proprietary, trying to maximize: bit-ratebit-rate density of packing of wavelengthsdensity of packing of wavelengths total number of wavelengths carriedtotal number of wavelengths carried distance that can be spanned without requiring O-E-O distance that can be spanned without requiring O-E-O

(Optical to Electrical to Optical) regeneration.(Optical to Electrical to Optical) regeneration.


Strategy for Standardization of Optical Transport NetworksStrategy for Standardization of Optical Transport Networks

Standardize around digital frame formats supporting (initially) client Standardize around digital frame formats supporting (initially) client bit rates of 2.5, 10, and 40 Gbpsbit rates of 2.5, 10, and 40 Gbps

Develop layered network architecture (as for SDH) to support in-Develop layered network architecture (as for SDH) to support in-service monitoring, fault detection, and isolation.service monitoring, fault detection, and isolation.

Monitoring occurs at “3R” points in the network.Monitoring occurs at “3R” points in the network. Fully standardize “path” layers to support end to end transport of Fully standardize “path” layers to support end to end transport of

client signalsclient signals Partially standardize line and section type layers to allow interconnect Partially standardize line and section type layers to allow interconnect

at handoff points in the network without limiting the ability of vendors at handoff points in the network without limiting the ability of vendors and operators to take advantage of new technologies.and operators to take advantage of new technologies.


Network Evolution - Transport Network Evolution - Transport

XX XX

XXXX

XX

XX

Long Haul/Ultra Long HaulLong Haul/Ultra Long Haul

XX

XX

XXXX

XX DWDM mesh

Metro CoreMetro Core

STM 64/256Rings or Mesh XX

OADM Rings or Mesh XX

XX

Metro AccessMetro Access

ISP

Businessuser

Campus/MTB site

E3E3

STM 16/64Rings

Metro DWDM

E1E1E2E2

STM 1/4Rings

STM 1/4Rings

XX

Network ManagementNetwork Management

• Increase in IP/Ethernet transport

• Overlay Data Networks - Public LANs/WANs

• New services/providers

• Optical metro supports ring/mesh router networks

• Overlay IP Networks - Routers with integrated optics

• GMPLS routing and restoration

• All-optical (DWDM) networks

• Optical switching nodes

• Support for meshed router networks

• Flatter feeder networks

Fast provision & High Churn Rate - volatile

Building on existing SDH infrastructure

Lowering transport costs Lowering provisioning

costs Delivering multi-services

Volatilty reflected from access

Increasing capacity SDH consolidation &

grooming Optical rings for capacity

build Direct access for

wavelength service

More stable - long haul transport High capacity DWDM for lowest cost per bit Managed Optical Networking

Common management across layers and domains Integrated technology layers - for data and transport Layer & vendor interworking Common control interface - GMPLS


Types of OTN Equipment

• Metro OADM using CWDM or DWDM• OADM for core applications using DWDM• Optical Line systems• Cross-connect : OEO and OOO• Mixed fabric switch OEO and OOO


• Metro ADM and Core OADM are very similar in network function to the SDH ADM

• DWDM Line Systems are terminating line equipment similar to SDH line systems• Two types of OTN cross-connects are envisaged

- ODU(Optical Data Unit) - Optical Channel (OCh) (ie. wavelength)

The ODU cross-connect is a digital cross-connect with O-E-O while the OCh cross-connect is an all optical cross-connect.

Types of OTN Equipment - continue


Mixed Fabric SwitchMixed Fabric Switch

OEO and OOO Cross-connect Node

Transparent OOO Switch

SDH/PDH/DataInterfaces

Local IP Routeror ATM switch

Transparent OOO Switch

ODU switching+

SDH/SONET switching

SDH OpticalInterfaces

DWDM OpticalInterfaces


Example of nested and cascaded ODUk monitored Example of nested and cascaded ODUk monitored connectionsconnections

A1 B1 C1 C2 B2 B3 B4 A2

A1 - A2

B1 - B2

C1 - C2

B3 - B4

TCM1 TCM1

TCM2

TCM1

TCM2

TCM3

TCM1

TCM2

TCM1 TCM1

TCM2

TCM1


TDM Multiplexing in the OTNTDM Multiplexing in the OTNNew Addition to G.709, October 2001New Addition to G.709, October 2001

ODUk multiplexing, allowing multiplexing of 4x2.5G ODUk multiplexing, allowing multiplexing of 4x2.5G clients into 10G wavelengths, 4x10G clients into 40G clients into 10G wavelengths, 4x10G clients into 40G wavelengths, and combinations of 2.5 and 10G clients into wavelengths, and combinations of 2.5 and 10G clients into 40G wavelengths.40G wavelengths.

Virtual concatenation of Optical Channel Payloads to Virtual concatenation of Optical Channel Payloads to allow inverse multiplexing of larger payloads into OTNs:allow inverse multiplexing of larger payloads into OTNs: May be used to invese multiplex 40G payloads to carry May be used to invese multiplex 40G payloads to carry

over only 10G capable fibers.over only 10G capable fibers. May carry future services at greater than 40G ratesMay carry future services at greater than 40G rates


OTN Multiplexing HierarchyOTN Multiplexing Hierarchy

ODU3 OPU3x 1

OTU1[V]

OTU2[V]

OTU3[V]x 1

x 1

x 1

OTM-n.m

x k

x j

x i

MappingMultiplexing

OCG-n.m

OCC

OCC

OCCx 1

x 1

x 11 i+j+k nOCh

OCh

OChx 1

x 1

x 1

OTM-nr.m

x k

x j

x i

OCG-nr.m

OCCr

OCCr

OCCrx 1

x 1

x 11 i+j+k nOChr

OChr

OChrx 1

x 1

x 1

OSCx 1

OOS OTS, OMS, OCh, COMMS OH

x 1

x 1

x 1

OTM-0.m

ODU2 OPU2x 1

x 4

x 16

ODU1 OPU1

Client Signal

ClientSignal

x 1

Client Signal

x 4

ODTUG3

ODTUG2

x 1

x 1


SDH StandardizationSDH Standardization

Network Architecture(G.803, G.805)

Structures and Mappings(G.707)

Physical Layer(G.957, G.691)

Equipment Functional Spec.(G.783, G.806)

Equipment Management(G.784, G.7710)

Information Model(G.774 Series)

Protection Switching(G.gps, G.841, G.842)

Laser Safety(G.664)

Data and Signaling Communications Network

(G.7712)

Jitter and Wander Perf.(G.825)

Error Performance(G.826-829)


Optical Transport Network (OTN) StandardizationOptical Transport Network (OTN) Standardization

Network Architecture(G.872)

Structures and Mappings(G.709)

Physical Layer(G.692, G.959.1, G.694.x)

Equipment Functional Spec.(G.798, G.806)

Equipment Management(G.874, G.7710)

Information Model(G.874.1, G.875)

Protection Switching(G.gps, G.otnprot)

Laser Safety(G.664)

Data and Signaling Communications Network

(G.7712)

Jitter and Wander Perf.(G.8251)

Error Performance(G.optperf)


ITU OTN Equipment RecommendationsITU OTN Equipment Recommendations

• G.798 Characteristics of OTN Hierarchy Equipment Functional Blocks

• G.709 Interfaces for OTN• G.8251 The Control of Jitter and Wander within the

OTN • G.872 Architecture of OTN• G.959.1 OTN Physical Layer Interfaces• G.694.1 Spectral Grid for WDM Applications : DWDM

Frequency Grid• G.694.2 Spectral Grid for WDM Applications : CWDM

Frequency Grid


Re-use in the development of OTN StandardsRe-use in the development of OTN Standards

Optical Fiber Recommendations (G.651, Optical Fiber Recommendations (G.651, G.652, G.653G.652, G.653, , G.654, G.654, G.655G.655))

Laser Safety Recommendation G.664.Laser Safety Recommendation G.664. Generic Equipment Functionality G.806.Generic Equipment Functionality G.806. Generic Protection Switching G.gps (under development).Generic Protection Switching G.gps (under development). Common Equipment Management Requirements, G.7710.Common Equipment Management Requirements, G.7710. Data Communication Network (DCN), G.7712.Data Communication Network (DCN), G.7712. Approach is to separate generic aspects from SDH Approach is to separate generic aspects from SDH

Recommendations to avoid “reinventing the wheel” for Recommendations to avoid “reinventing the wheel” for OTN.OTN.


SummarySummary

OTN technology introduces a number of new equipment:-OTN technology introduces a number of new equipment:-

Metro OADMMetro OADM Core OADMCore OADM Cross-connect - OEO and OOOCross-connect - OEO and OOO Line Systems Line Systems TDM MultiplexingTDM Multiplexing

workshop ip/optical; chitose, japan; 9-11 july 2002 otn equipment and deployment in today’s...

Documents

mesh x x oadm rings

long haulultra long

transparent transport

workshop ipoptical chitose

sdh technology

otn slide

applicability of sdh

transport of client