OTN Overview & Update Jean-Marie Vilain Product Specialist.
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Transcript of OTN Overview & Update Jean-Marie Vilain Product Specialist.
OTN Overview & Update
Jean-Marie VilainProduct Specialist
2© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
AgendaAgenda
3© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
SONET-SDH structureSONET-SDH structure
Sonet / SDH technologies have been out for a while now, the main goal was to Sonet / SDH technologies have been out for a while now, the main goal was to transport digital information over fiber, but also support electrical lower rate transport digital information over fiber, but also support electrical lower rate communication signalcommunication signal
payloadoverhead
payloadoverhead
4© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
SONET-SDH structureSONET-SDH structure
SONET / SDH supported transport rateSONET / SDH supported transport rate
5© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
SONET-SDH structureSONET-SDH structure
VCAT/LCASVCAT/LCAS
VCAT/LCAS and GFP offeredAutomatic Flexible bandwidth andClear way to map Ethernet traffic In to Sonet
6© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
Virtual Concatenation Bandwidth EfficiencyVirtual Concatenation Bandwidth Efficiency
ContiguousConcatenation
Virtual ConcatenationService Data Rate
SONET SDH
Effici-ency
SONET SDH
Effici-ency
Ethernet 10Mb/s STS-1 VC-3 20% VT-1.5-7v VC-12-5v ~90%ATM 25Mb/s STS-1 VC-3 50% VT-1.5-16v VC-12-12v 98%Fast Ethernet 100Mb/s STS-3c VC-4 67% STS-1-2v VC-3-2v 100%Fiber Channel 200Mb/s STS-12c VC-4-4c 33% STS-1-4v VC-3-4v 100%Gbit Ethernet 1000Mb/s STS-48c VC-4-16c 42% STS-1-21v VC-4-7v 95%
EfficiencyIncrease
67%100%
7© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
GFPGFP
VCAT/LCASVCAT/LCASEthernet map into SDH/SONETUsing GFP
8© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
WDM TransmissionWDM Transmission
ADMADMDXC
ADM ADM
ADM
ADM
ADM
ADMADM
ADM
WDM line systemfor fiber saving
WDM fiber WDM
WDMWDM fiberWDM
WDM
Services Layer
Delivery of services to
end customers.
SDH/SONET Layer
High-speed protection/restoration.
Time division multiplexing
Optical layer
Wavelength division multiplexing
High level protection
WDM line system
9© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
Why OTNWhy OTN
ITU G.709 is the OTN Standard
ITU G.709 is the OTN Standard
11© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
Why OTNWhy OTN
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OTN mapping structureOTN mapping structure
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OTN Frame FormatOTN Frame Format
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OTN Overhead structureOTN Overhead structure
The FAS/MFAS provides frame alignment.
The FAS/MFAS provides frame alignment.
The Section Monitoring provides Error detection and
communication
The Section Monitoring provides Error detection and
communicationThe ODU overhead brings TCM support, Communication channels and Automatic
protection switching
The ODU overhead brings TCM support, Communication channels and Automatic
protection switching
The OPU overhead adapt the client signal to the optical
channel, specifying the type of client signal in the payload
The OPU overhead adapt the client signal to the optical
channel, specifying the type of client signal in the payload
15© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
Why the use of OTN over SONET/SDHWhy the use of OTN over SONET/SDH
OTN provide better TCM support
Over-multiple
Carriers.
SDH/SONET only support one TCM vs.
6 TCM for OTN
SDH/SONET only support one TCM vs.
6 TCM for OTN
16© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
› FEC provides the following benefits.
› Improves the BER performance of an existing link › Increases the maximum span of a link can extend up to 20km and remove the
need of regenerator › Improves the overall quality of the link by diagnosing link problems earlier
Forward Error Correction (FEC)Forward Error Correction (FEC)
17© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
ITU G.709 Sup 43 Over-Clocked OTN rates OTU1e – OTU2eITU G.709 Sup 43 Over-Clocked OTN rates OTU1e – OTU2e
The goal here, is to combine multiple 10GE ports from the Core router directly into OTN.
Not to be confused with OTU1 which is a 2.7 Gbit/s signal, these are 10G ratesNot a big issue with 10GE Wan (9.953 Gb/s) where the signal can be directly map into an OPU2 containerThis is more a problem with the 10GBASE-R 10GE LAN, where there’s a size mismatch between the containers.
20© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
Ethernet in Carrier Networks EoOTNEthernet in Carrier Networks EoOTN
ODU1 mux in ODU2
OTU2 , OTU3 or even OTU4
OTU1
ODU MUX
1GigE in ODU0 in OTU1
Access Routers
Access Routers
Access Routers
OTU2
OTU1 with ODU0
OTU2
10/100M Ethernet link
GigE link
OTU1
Access Network
ENIU
MSPP
MSPP
21© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
Client Interface cardsClient Interface cards
Transponder cards • Proper provisioning• Power levels• Bit Error Rate tests• FEC (OTN)
100M/GbE
10GbE
FC
SONET/SDH
10.7G OTN
(G.709)
DWDM
& OLA
Powerful
• Unframed/ frame testing
• SONET/SDH (10G)
• OTN (OTU1/2/1e/2e) with FEC
• 10/100/1000BaseT, Gig-E & 10G Ethernet
• 1x/2x/4x/10x FC
8130NGE
22© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
• ODU0 is a new container size that has been introduced in the G.709 to accommodate efficient transport of Gigabit Ethernet (1.25 Gb/s). OTU1 was not efficient for 1GbE signal with a payload rate of 2.48832Gb/s
• ODU0 is half the size of an ODU1 container i.e = 1.244 160 Gb/s
• Gigabit Ethernet does not fit in the OPU0 payload, GMP will be use to insert the Gigabit Ethernet rate inside OPU0 rate
Note: ODU0 does not have a physical instance (i.e. there is no OTU0), the signal needs to be multiplexed into a higher layer in order to be transported on the OTN network
New ODU 0 OTN containerNew ODU 0 OTN container
23© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
› ODU0
› New multiplexing method1 that allows direct ODU0 multiplexing into ODUk (k=2,3,4) in a single stage
• This multiplexer uses Generic Mapping Procedure (GMP) for ODU0 justification control
• Where GMP will support various client signals and future new ones. It is a generic procedure for mapping a client signal with any bit rate less than the payload capacity to the ODU.
New ODU 0 OTN containerNew ODU 0 OTN container
24© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
› ODU0 mapping?
› The mapping of a ODU0 into a ODU1 is done using ODTU01 (optical channel data unit tributary ) where the ODU1 structure is divided into two sections and where both ODU0 are map. Each needed ODU0 are mapped in to the payload using GMP to specific timeslot.
Technology Overview Technology Overview ODU ODU
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› Any client signal can be map into the payload using the below process, where each low order signal will mux into a timeslot and be insert in to the payload
Technology Overview Technology Overview
26© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
› ODUflex is a new OTN variable container introduce in October 2009› Allows for flexible ODU rates for transparent transport of any client
signal, it used a similar process to VCAT except that there is no delay because the signal is map in to the same physical container
› Adapted in 2 ways:o For Constant Bit Rate (CBR)client signals
Rate = 239/238 x CBR rateo For GFP-F mapped packet client signals
Rate = N x ~1.25Gbit/s (ODU0) with 1 ≤ N ≤ 80
ODUflexODUflex
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40GE/100GE Mapping into OTN 40GE/100GE Mapping into OTN
› Wide-area Ethernet transport technologies are necessary to support, for example, the connection of Ethernet switches separated by more than 40 km (typical distance supported by Ethernet standards).
› ITU-T SG15 is responsible for OTN standardization and IEEE 802.3ba is responsible for 40G/100G Ethernet standardization; both working closely to develop 40GE/100G transport capability over OTN
28© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
40GE/100GE Mapping into OTN 40GE/100GE Mapping into OTN
› Standard 40GE runs at 41.25Gbps and OPU3 payload is only 40.15 Gbps
› Therefore, mapping 40GE over OTU3 requires 1024/1027B transcoding adaptation to reduce 40GE coded rate
OH
Using 1024B/1027B
40.117G
40.15052GODU3
40.319G
GMP
OH
103.125G
104.355G
GMP
1x 1x
OTU4
ODU4104.794G
100GE
1x 1x
OTU3
40GE
41.25G40GE with 64B/66B Transcoding
29© 2010 EXFO Inc. All rights reserved.© 2010 EXFO Inc. All rights reserved.
1.1. OTN OTL (OTU3/OTU4) OTN OTL (OTU3/OTU4)
Client Client
OCh Payload Unit (OPU) PayloadOCh Payload Unit (OPU) PayloadOPU OH
OPU OH
OCh Data Unit (ODU) PayloadOCh Data Unit (ODU) PayloadODUOH
ODUOH
OCh Transport Unit (OTU) PayloadOCh Transport Unit (OTU) PayloadOTU OH
OTU OH FECFEC
OTLk.nOTLk.n OTLk.nOTLk.n OTLk.nOTLk.n
1 2 n
OTL type & bit rateOTL3.4 = 10.7Gb/s OTL4.4 = 27 95Gb/s OTL4.10 = 11.18Gb/s
OTUk & bit rateOTU3 = 43Gb/s OTU4 = 112Gb/s
OTUk signal is transmitted over n lanesOTUk signal is transmitted over n lanes
NewNew
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Traditional OTN StructureTraditional OTN Structure
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New OTN StructureNew OTN Structure
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