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8/10/2019 OTN Technology
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OTN Technology
Luis E. Compagnucci
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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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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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Claro Argentina OTN Network
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Claro Argentina OTN Network
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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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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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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Thank you !!!