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Lappeenranta University of Technology. “Why Do We Need WDM Networks?”. Valery Naumov Telecommunications Laboratory. [email protected] Tel: 05 621 3618. If xDSL reaches same penetration as modems then network capacity will have to increase by 100s times. Growth of Traffic. - PowerPoint PPT Presentation
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Lappeenranta University of Technology
Valery NaumovTelecommunications Laboratory
[email protected]: 05 621 3618
““Why Do We Need WDM Networks?”Why Do We Need WDM Networks?”
Growth of TrafficGrowth of Traffic
If xDSL reaches same penetration as modems then network capacity will have to increase by 100s times
Internet Traffic is growing around Internet Traffic is growing around 10% a month10% a month
Data network
volume will exceed voice in
2000-2001
By 2005 voice will be 1-5% of all
traffic
IP Telephony could be IP Telephony could be VERY BIGVERY BIG
Source: Analysis
If IP will be the dominant traffic then If IP will be the dominant traffic then optimize network design for IP!optimize network design for IP!
Internet traffic is asymmetric Telecommunication system of
today are designed to support symmetric voice traffics
1)
2)
WDM -WDM -Wavelength Division MultiplexingWavelength Division Multiplexing
Why Do We Need WDM?Why Do We Need WDM?WDM
combines multiple optical
signals so that they can be
amplified as a group and transported
over a
Each signal carried can be at a different rate (STM-1/4/16 etc.) and in a different
format (SDH, ATM, data,
etc.)
voice data videovoice data video
IPIP Frame Frame RelayRelay
ATMATMSDHSDH
WDMWDMsingle fiber.
Multi-layer NetworksMulti-layer Networks
T1304480-95/d04
TrailAP AP
Trailtermination
Network connection
TCPSNC
CPLink connec tion
Trailtermination
TCP
Client toserver
adaptation
Clientlayer
network
Trail
Client toserver
adaptation
APAP
Trailtermination
Trailtermination
Serverlayer
network
TCP
SNC
CP
LC
CP
LC
CP
LC
CP
SNC
TC P
FIG U R E 3 /G .805
E xam p le functiona l m od el
ITU-T Recommendation G.805 “Generic functional architecture of transport networks”:
A transport network can be decomposed into a number of independent transport layer networks with a client/server association between adjacent layer networks.
Optical WANOptical WAN
3 STM-16 Tx1 STM-16 Rx
Both sides of fiber ring used for IP traffic
High PriorityTrafficCannot exceed50% of bandwidthin case of fiber cut
Low priority trafficthat can be bufferedor have packet lossin case of fiber cut
AsymmetricTx/Rx lambdasthat can bedynamicallyaltered
OADMOADM
SDHSDH
Traditional SDH Restoral
Optical MANOptical MAN Carrier Routers
To Protection FiberTo Working Fiber
Packet overSDH
GigaPOPRouter
GigaBit Ethernet
University ARouter
OADM
Ethernet
Local WDM Fiber Ring Provided by Cable Company or Telecom Operator
CambrianBox
ATM
University BRouter
OADM
OADMOADM
Central Office
WDM Network R&DWDM Network R&D Common platform to provide network management, security and
support for integrated traffic Capacity usage and routing strategies
Designing survivable optical networks
Wavelength management to ensure QoS
Protection strategies for service differentiation
Development of the switchable WDM network must occur in a number of phases:
point-to-point one channel, point-to-point multichannel with WDM, network with fixed routing of WDM channels, network with protection switching capabilities in the WDM domain, and finally flexible network with switching functions for all channels in WDM crossconnects
Distributed Object-oriented Tool for Network Visualisation and Analysis (DOTNET)
EU COST 263 Project Quality of Future Internet Services
QoS characteristicsend-to end delay, jitter, throughput, reliability
Network resourcesbandwidth, buffer capacity, processing power
Resource management
state control, selection, reservation, scheduling and protection
Traffic engineeringtraffic differentiation, provision of different QoS levels
Each layer network uses its own dedicated QoS provisioning mechanism that is optimised for its particular usage