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Mar del Plata, Argentina, 31 Aug – 1 Sep 2009
ITU-T Kaleidoscope 2009Innovations for Digital Inclusion
Virgilio [email protected] Zadedyurina
OPTICAL TRANSPORT NETWORKS: FROM ALL-OPTICAL
TO DIGITAL
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009 ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion 2
Outlines
Traditional DWDM based on OTN (Optical Transport Network) ITU-T G.872;
IPoDWDM;
ODN (Optical Digital Network);
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009 ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion 3
Introduction
IP traffic today becomes dominant:New application based on IP (video communication, P2P, etc.);Old application migrate to IP (ex. SS7);IP traffic has overcome capacity of currently used wavelength 10Gb/s;
Today trend/evolution is: Eliminate SDH/SONET layer; Move Transport from Optical to Digital;
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009 ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion 4
Traditional DWDM as an OTN
DWDM is a fully optical network which provides transparency:
only 1R regeneration (optical amplification-equalization and CD compensation); theoretically the signal can be delivered from every ONE to any other.
Traditional (OTN) approach becomes hardly realizable for big network;
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009 ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion 5
IPoDWDM ApproachInsert IP traffic into DWDM without mapping into SDH frame; Integration of DWDM transponders directly into IP switch/router.
IPoDWDM
OTNTransponderTransponder
Transponder
G.709
IP r
oute
rs
Transponder
G.709
IP r
oute
rs
TransponderTransponder
MUX
Colored interface
Gray interface
Transponder
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009 ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion 6
IPoDWDM intelligence
Preemptive traffic protection becomes possible
OTN
BER
Corr
ect
ed b
its
Optical Impaiments
FEC Limit
Working path Lost data
Protection p.
PO
S o
n r
oute
rTra
nsp
onder
IP L
ayer
SD
H/D
WD
M L
ayer
LOF
IP L
ayer
+ G
.70
9 o
n r
oute
r
IPoDWDM
BER
Corr
ect
ed b
its
Optical Impaiments
FEC Limit
Work path Protection path
Switch threshold
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009 ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion 7
Optical Digital Network Approach
The philosophy of ODN is based on O-E-O conversion whenever it is possible.
OTN manipulate analogical wavelengths;
ODN manipulate digital “bits”.
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009 ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion 8
Network Layers: OTN vs ODN
OTM0PhysicalSection(OPSO)
Optical Transmission Section (OTS)
Band Multiplex Section (BMS)
Optical Digital Channel (ODCh)
Optical Channel Transport Unit (OTU)
Optical Channel Data Unit (ODU)
Optical Channel Payload Unit (OPU)
IP ATM Ethernet STM-N
Dig
ital
Analo
g
OTM0(not colored,
no OSC)
Optical Transport Module (OTM-n, n>1)
OTM0PhysicalSection(OPSO)
Optical Transmission Section(OTS)
Optical Multiplex Section (OMS)
Optical Channel (OCh)
Optical Channel Transport Unit (OTU)
Optical Channel Data Unit (ODU)
Optical Channel Payload Unit (OPU)
IP ATM Ethernet STM-N
Dig
ital
Analo
g
OTM0(not colored,
no OSC)
Optical Transport Module (OTM-n, n>1)
OTN ODN
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009 ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion 9
ODN advantages
Each OADM site implements 3R regeneration:
the signal is cleaned up from noise and others distortion;It becomes possible to implement higher number of Channels -160 (C band, spacing 25 GHz);
The network lose transparency.
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009 ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion 10
ODADM Description
MBM
West
Lin
e
O-EO-EO-EO-E O-E O-E O-E
FECDigital W.
DSP
Matrix
To interface modules
MBM
East
Lin
e
O-EO-E
O-EO-E
O-EO-E
O-E
FECDigital W.
DSP
Matrix
To interface modules
Specific Interface Module
Electrical connection
Optical connection
Optica
l Splite
rOpti
cal Split
er
Optical pass-through
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009 ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion 11
RECONCILATION BETWEEN THEAPPROACHES
To integrate different approach the existing OTN network must support Alien Wavelets (ITU-T G.698.2)
IPoDWDM is easy to integrate into OTN; IPoDWDM is easy to integrate into ODN but not efficiently; ODN can be integrate into OTN using an optical band split filter.
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009 ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion 12
Example of ODN-OTN integration
The majority of deployed DWDM networks are equipped with 100GHz lambda spacing while transponders have stability for 50GHz spacing.
Even frequencies
Odd frequencies
192 192.1192.2192.3
192.4192.5
192.6
100Ghz
192.05192.15
192.25192.35
192.45192.55
192.65192.75
West Line East Line
50
Ghz-
10
0G
hz
Filt
er
50
Ghz-
10
0G
hz
Filt
er
C-Band ODADM
C-Band ROADM
100Ghz
Capacity Evolution
10 Gb/s -> 40 Gb/s -> 100 Gb/s- CD increases and PMD appears;ODN and IPoDWDM: - the limit of 160 channels (L+C band)ODN: - due to E-O-E no dispersion problems.
- granularity of PIC is inflexible parameter (today either 10 or 40 Gb/s based)
New capacities are being studied byIEEE 802.3ba
G.698.2 should standardize new interfaces
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009 ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion 13
Conclusions
OTN, IPoDWDM, ODN approaches analyzed;IPoDWDM and ODN are seen as very promissing;Examples on integration of both technologies;Stimulus for further research and standardization activities;
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009 ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion 14
Back up
The following slide are for back up
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009 ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion 16
OTN Network Elements
OLT (Optical Line Terminal)OADM/ROADM (Optical Add Drop Multiplexer) also ReconfigurableOLA (Optical Line Amplifier)OXC (Optical Cross-Connect)
OTS OTS OTS OTS OTS
OMS OMS
Och (not terminated in OADM site)
Client (not terminated in OADM site)
OLT OADM OLTOLA OLA OLA
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009 ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion 17
IPoDWDM Network Elements
OTS OTS OTS OTS OTS
OMS OMS
DWDM MUX/DMUX
Optical fibre
Optical Line Amplifier
Optical colored interface
Client-OCh-OTU-ODU-OPU (yellow & green lambda)
OCh - Optical ChannelOMS - Optical Multiplex SectionONE - Optical Network ElementOTS - Optical Transmission Section
OTU - Optical Channel Transport Unit ODU - Optical Channel Data Unit OPU - Optical Channel Payload Unit
G.698.2 “black-link”
IP RouterClient-OCh-OTU-ODU-OPU(red & blue lambda)
Client-OCh-OTU-ODU-OPU(red & blue lambda)
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009 ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion 18
ODN Network ElementsClient
MBM (Multiplexing Band Module)
Electrical connection
OLA (Optical Line Amplifier)
Optical connection
OTS OTS OTS OTS OTS
BMS BMS
ODCh ODCh
ODCh - Optical Channel
OTS - Optical Transmission Section
BMS - Band Multiplex Section
DNE DNE DNE
DNE - Digital Network Element
OPUODU
OTU OTU
OTU - Optical Channel Transport Unit ODU - Optical Channel Data Unit OPU - Optical Channel Payload Unit
