OTN Technology

8/10/2019 OTN Technology

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OTN Technology

Luis E. Compagnucci

[email protected]


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Proprietary and Confidential2

Contents

DWDM Overview

Transmission Media

Optical Transport Network (OTN)

Claro Argentina OTN Network

Use Cases


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DWDM Overview


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Proprietary and Confidential

Solution of capacity expansion

SDM

Add fiber &

equipment

Time & cost

TDM

STM-16STM-64

Cost &Complication

WDM

Economical &

Mature & Quick

How to increase network capacity ?


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WDM Concept

1

2

1 2 n

n

SDH signal

IP package

ATM cells

Different signals with specific wavelength are multiplexed into afiber for transmission.


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The overall structure of the WDM system of N-path wavelength:

Optical Transponder Unit (OTU)

Optical Multiplexer Unit / Optical De-multiplexer Unit (OMU/ODU)

Optical Amplifier (OA)

Supervisory Channel (OSC/ESC)

System Structure

OTU

OTU

OTU

MUX

DMU

X

OTU

OTU

OTU

OSC OSCOSC

OLA

Client Signals

Colored Signals

Multiplexed Signals

Client Signals


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CWDM VS DWDM

CWDM: Coarse Wavelength Division Multiplex

DWDM: Dense Wavelength Division Multiplex


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Transmission Media


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Structure of Optical Fiber


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Attenuation

900 1300 1400 1500 1600 1700

nm

dB/km

2

3

1

4

5

1200

Mu

lti-mode

850~900n

m

Oband

E S C L U

OH-


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Dispersion

Chromatic dispersion [ps/nm]

Polarization Mode Dispersion [ps]


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Dispersion

coefficient

G.655

1550nm1310nm

17ps/nm.km

Widely Deployed Fiber Types

G.652:widely used, needdispersion compensation forhigh rate transmission

G.653: Zero dispersionat 1550nm window.

G.655: Little dispersionto avoid FWM.Suitable for DWDM


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OTN - Optical Transport Network


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OTN System

An Optical Transport Network (OTN) is composed of a set of Optical Network

Elements connected by optical fiber links, able to provide functionality of transport,

multiplexing, routing, management, supervision and survivability of client

signals, according to the requirements given in Rec. ITU-T G.872 and Rec. ITU-T

G.8080. The Rec. ITU-T G.709 describes the Interfaces for the optical transport

network

Management

OTN

Jitterand

wander

Networkprotection

Equipmentfunction andfeatures

Structureand

mapping

Physiclayer

features

Architecture

G.874G.874.1

G.8251G.8201

G.873.1G.873.2

G.798G.806

G.709G.7041G.7042

G.959.1G.693G.694

G.872G.8080


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What is OTN ?

It is a set of standards developed by ITU in order

to better support

Transparent Client Signal Transport

Efficient Service Multiplexing Into wavelengths

Unified Management

SDH like OAM

Protection Schemes


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Pre-OTN DWDM Networks


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The OTN Approach


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Network View

IP Layer: Router Links

Electrical Layer: Client

Mapping, Multiplexing,

Grooming, Monitoring,

Protection and

Restoration

Optical Layer:

Transport, Add Drop,

Protection and

Restoration


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OTN Control Plane - ASON

1. Discovery

3. Maintenance / Operations

2. Connection / Teardown

4. Protection & Restoration

OSSInitiated

Migrated

Traffic

PlannedMaintenanceWorks

OSSInitiated

NetworkFailure

Auto-Restored

Traffic


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OTN Architecture

Multiple Client Signals

Optical Payload Unit (OPUk)

Optical Data Unit (ODUk)

Optical Transport Unit (OTUk)

Optical Multiplexing Section

Optical Transport Section

Optical Channel

K= 1, 2, 3, 4

K= 1, 2, 3, 4

K= 1, 2, 3, 4


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Types and Capacity

Types nominal bit rate bit rate tolerance

OTU1 2 666 057.143 kbit/s

20 ppm

OTU2 10 709 225.316 kbit/s

OTU3 43 018 413.559 kbit/s

ODU1 2 498 775.126 kbit/s

ODU2 10 037 273.924 kbit/s

ODU3 40 319 218.983 kbit/s

OPU1 2 488 320 kbit/s

OPU2 9 995 276.962 kbit/s

OPU3 40 150 519.322 kbit/s


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OTN Multiplexing and Mapping Structure

Mapping

Multiplexing

ODTUG3

ODTUG2

OChr

OChr

OChr

OCh

OCh

OCh

OTU3[V]

OTU2[V]

OTU1[V]

Client signal

Client signal

OPU3ODU3

OCCr

OCCr

OCCr

OCC

OCC

OCC

OCG-nr.m

1 i+j+k n

OCG-n.m

1 i+j+k n

OPU2ODU2

1OPU1ODU1

OTM-nr.m

OTS, OMS, OCh, COMMSOSC OOS

OTM-n.m

4

1

14

161

11

1

1

1

1

1

1

1

1

1

1

1

1

1

1

i

j

k

i

j

1

Clientsignal

1

OTM-0.m

k


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OTN Frame Format

3825

4080

1 7 8 14151617

3824

1

2

3

4

OPU k payload

OPUkO

H

OPUk - Optical Channel Payload Unit

ODUkOH

ODUk Optical Channel Data Unit

Client signal

mapped inOPUk payload

Client signal

OTUKFEC

OTUkOH

OTUk Optical Channel Transport Unit

Alignm

Alignment

k :

1 2.5G2 10G3 40G


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OTN Overhead Overview

ODUk OH TCMACT: Tandem Connection Monitoring

Activation/deactivation control channel

TCMi:Tandem Connection Monitoring i FTFL:Fault Type & Fault Location reporting

channel

PM: Path Monitoring

EXP:Experimental

GCC1/2: General Communication Channel1/2

APS/PCC:Automatic Protection Swiching

coordination channel/Protection

Communication Control channel

Alignment OH FAS: Frame Alignment Signal

MFAS: MultiFrame Alignment Signal

OTUk OH SM: Section Monitoring

GCC0:General Communication Channel0

RES: Reserved for future international

standardisation

OPUk OH PSI: Payload Structure Identifier

JC: Justification Control

NJO: negative justification opportunity

RES

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1

2

3

4

TCM3

TCM6 TCM5

TCM2 TCM1

TCM4

PM

TCMACT

GCC1

FTFL RES JC

RES JC

NJOPSIGCC2 APS/PCC RES

EXP

FAS MFAS SM GCC0 RES JCRES


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OTN Summary

Any-Service

Platform

Efficient

Service

Configuration

High

bandwidth

grooming

High

Bandwith

Transport

Advanced

O&AM and

protection


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Current SDH/ETHERNET + P2P DWDM becomes rigid

Time-to-service for medium level services (STM16 and GE)

is very high.

Need of a more flexible and reliable network using existing

resources

OTN switching network composed by 38 distributed Nodes.

ASON over OTN provide high reliability and fast provisioning.

Existing DWDM links from different venders used as

transport layer.

Drivers

Solution:


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DWDM Equipment in Claro Argentina

HUAWEI

OSN6800 OSN 8800BWS1600G

HUAWEI HUAWEI

OME6500

CIENA

ZXWM M920

ZTE

1626 LM

ALCATEL

CN4200

CIENA

Used OTN


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Claro Argentina OTN Network Topology


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Use Cases


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Use Case 1: Any-service reliable transport

OTN XC

GE, 2 x STM-16

Client Signals

OTU2

GE, 2 x STM-16

Client Signals

OTU2

OTN XC

Argentina

Chile


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Use Case 2: Faster Provisioning of new services

Bs As

Tucuman

New

Customer

NMS


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Use Case 3: BB IP Protection & Restoration

REFERENCIAS

Router BBIP

Equipo OTN

Equipo DWDM

Link Principal

BBIP segurizado

por red OTN

Link Secundario

Link de Reserva

utilizados


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REFERENCIAS

Router BBIP

Equipo OTN

Equipo DWDM

Link Principal

BBIP segurizado

por red OTN

Link Secundario

Link de Reserva

utilizados


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REFERENCIAS

Router BBIP

Equipo OTN

Equipo DWDM

Link Principal

BBIP segurizado

por red OTN

Link Secundario

Link de Reserva

utilizados


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Thank you !!!

Documents

OTN Technology