sdh planning

SDH Network PlanningSDH Network Planning

Presented by: Presented by: Ren HailanRen Hailan

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ContentContent☆☆ Introduction of SDH network planningIntroduction of SDH network planning☆☆ SDH network architecture SDH network architecture

☆☆ Topology of SDH networkTopology of SDH network

☆☆ SelfSelf--healing ring planninghealing ring planning

☆☆ SDH networking applicationSDH networking application

☆☆ SDH networking evolutionSDH networking evolution

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Principles of network planningPrinciples of network planning

Requirement and ApplicationRequirement and Application–– Customer demand on network reliability and Customer demand on network reliability and

availability;availability;–– Customer demand for broadband and new services;Customer demand for broadband and new services;

Advancement and MaturityAdvancement and Maturity–– Risk taking for employing new technology;Risk taking for employing new technology;–– Financial justification on selecting a suitable Financial justification on selecting a suitable

technology;technology;

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Principles of network planningPrinciples of network planningAbility of upgradeAbility of upgrade–– Interface that can accept old system.Interface that can accept old system.–– capable to meet the future demand ;capable to meet the future demand ;–– compatible to the existing network and future compatible to the existing network and future

network(open standard);network(open standard);

Easy to maintainEasy to maintain–– CAPEX&OPEXCAPEX&OPEX–– Training cost for operation staff to adapt to new Training cost for operation staff to adapt to new

technology;technology;–– Running cost for OA&MRunning cost for OA&M

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Principles of network planningPrinciples of network planning

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Network EvaluationNetwork EvaluationCost efficiency;Cost efficiency;Network robustness;Network robustness;Manageability;Manageability;Flexibility;Flexibility;Compatibility;Compatibility;

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Selection of transmission technologiesSelection of transmission technologies

Backbone networkBackbone network–– DWDM DWDM

Metro networkMetro network–– DWDMDWDM

(various types of interface, low capacity, small (various types of interface, low capacity, small coverage area, high survivability, ring topology)coverage area, high survivability, ring topology)

–– CWDMCWDM–– SDHSDH

A suitable choiceA suitable choiceMSTPMSTP

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Definition of SDHDefinition of SDH

SDHSDH (Synchronous Digital Hierarchy)(Synchronous Digital Hierarchy)An international standard for An international standard for teletele--communication communication networknetworkA synchronous digital transport system aimed at A synchronous digital transport system aimed at providing a more simple, economical, and flexible providing a more simple, economical, and flexible telecommunications network infrastructuretelecommunications network infrastructureA technologies about integrated information A technologies about integrated information network that has combined the function of network that has combined the function of multiplexing/transmission/crossmultiplexing/transmission/cross--connection connection

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Advantages of SDH Advantages of SDH International standardInternational standard NNI NNI specificationsspecificationsBased on direct synchronous multiplexing and flexible Based on direct synchronous multiplexing and flexible mappingmappingProvide abundant builtProvide abundant built--in signal capacity for network in signal capacity for network Operation,Administration and Maintenance(OAM)Operation,Administration and Maintenance(OAM)Function of transparent transmission for information Function of transparent transmission for information payloadpayloadFunction of interconnect network equipment from different Function of interconnect network equipment from different vendorsvendorsBackward and forward compatibilityBackward and forward compatibility

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NNINNI NNINNI NNINNI NNINNI

TRTR

TRTR

TRTR

SM

SM

SM

SM

SM

SM

DXCDXCLINELINE

TRTR

TRTR

TRTR

LINELINE

NNI (Network Node Interface)NNI (Network Node Interface)

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Importance of SDH planningImportance of SDH planningSDH technology makes possible the transports SDH technology makes possible the transports of broad range of services. of broad range of services. SDH is an important technologies to construct SDH is an important technologies to construct the telecom transport network. the telecom transport network. SDH offers a large transmission capacity, SDH offers a large transmission capacity, which calls for networks able to survive serious which calls for networks able to survive serious failures in cable facilities and at equipment failures in cable facilities and at equipment sites.sites.

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Importance of SDH planningImportance of SDH planningWith its diverse network architectures, NE With its diverse network architectures, NE capabilities, and integrated planning capabilities, and integrated planning requirements, SDH completes the overall requirements, SDH completes the overall planning. planning. SDH brings new challenges in network SDH brings new challenges in network architecture interconnection and architecture interconnection and interworkinginterworking..How to utilize different architectures to meet How to utilize different architectures to meet diverse demands in an efficient manner is a diverse demands in an efficient manner is a key issue in survivable SDH network design.key issue in survivable SDH network design.

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SDH network survivability designSDH network survivability designNetwork survivability can be obtained by Network survivability can be obtained by

introducing:introducing:Redundancy inside Redundancy inside NEsNEs (e.g. spare modules)to (e.g. spare modules)to increase their reliability;increase their reliability;Spare resources (new links/capacity)to allow Spare resources (new links/capacity)to allow traffic rerouting;traffic rerouting;Network management system to handle traffic Network management system to handle traffic rerouting and to optimize the utilization of rerouting and to optimize the utilization of spare resources.spare resources.

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Network Survivability DesignNetwork Survivability DesignWhen designing a highly available network,many When designing a highly available network,many aspects must be consideredaspects must be consideredThe required survivability directly affects the The required survivability directly affects the applications and services to be supported over the applications and services to be supported over the network.network.A key criterion is the networkA key criterion is the network’’s restoration speed.s restoration speed.A network carrying voice traffic must definitely recover A network carrying voice traffic must definitely recover from any network failure within a matter of ms.from any network failure within a matter of ms.A network only carrying Internet traffic may restore A network only carrying Internet traffic may restore within only a second or less.within only a second or less.

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Network Survivability DesignNetwork Survivability DesignIt is important to realize that fast restoration mostly It is important to realize that fast restoration mostly requires a high amount of spare capacity for protection requires a high amount of spare capacity for protection purposes.purposes.Additional wavelengths or TDM channels must be Additional wavelengths or TDM channels must be reserved in order to be available for rerouting of failed reserved in order to be available for rerouting of failed traffic.traffic.Several restoration and protection mechanisms are Several restoration and protection mechanisms are available.available.Each mechanism has its specific advantages and Each mechanism has its specific advantages and disadvantages,but apart from that,the used mechanism disadvantages,but apart from that,the used mechanism must provide enough flexibility to adapt to changing must provide enough flexibility to adapt to changing network requirements.network requirements.

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Comparison of survivable networksComparison of survivable networks

ParameterParameterParameter Linear topologyLinear topologyLinear topology Self Healing RSelf Healing RSelf Healing R Mesh networkMesh networkMesh network

Spare capacityneededSpare capacitySpare capacityneededneeded moremoremore moderatemoderatemoderate lesslessless

Restored timeRestored timeRestored time fastfastfast fastfastfast slowslowslow

Network scaleNetwork scaleNetwork scale Point-to-pointPointPoint--toto--pointpoint District networkDistrict networkDistrict network Global networkGlobal networkGlobal network

Costs of nodesCosts of nodesCosts of nodes moderatemoderatemoderate LowLowLow HighHighHigh

Fibers neededFibers neededFibers needed MoreMoreMore LessLessLess ModerateModerateModerate

FlexibilityFlexibilityFlexibility LowLowLow ModerateModerateModerate HighHighHigh

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ContentContent☆☆ Introduction of SDH network planningIntroduction of SDH network planning

☆☆ SDH network architecture SDH network architecture ☆☆ Topology of SDH networkTopology of SDH network




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Layering:Layering: A transport network can be A transport network can be decomposed into a number of independent decomposed into a number of independent transport layer networks with a client/server transport layer networks with a client/server association between adjacent layer networks. association between adjacent layer networks.

Partitioning:Partitioning: Each layer network can be Each layer network can be separately partitioned in a way which reflects separately partitioned in a way which reflects the internal structure of that layer network .the internal structure of that layer network .

Layering and PartitioningLayering and Partitioning

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Specific circuitlayer network

Specific circuitlayer network

Specific pathlayer networkSpecific pathlayer network

Transmission medialayer network

Transmission medialayer network

SubSub--networksnetworks LinksLinks

Layering ConceptLayering Concept

A layer networksA layer networks

Partitioning ConceptPartitioning Concept

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Link Connection

Trail

Network Connection

Adaption

Termination

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PartitioningPartitioning–– Reduce the management range Reduce the management range

CoreAccess AccessCPN CPN

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Layering and PartitioningLayering and PartitioningLayering ConceptLayering Concept: : Transport layer networksTransport layer networks

Circuit layer networks

Circuit layer Circuit layer networksnetworks

Path layer networks

Path layer Path layer networksnetworks

Transmission media layer

networks

Transmission Transmission media layer media layer

networks networks

Leased line circuit

network

Leased line Leased line circuit circuit

networknetwork

SDH VC-3 path networkSDH VCSDH VC--3 path network3 path network

64kb/s based circuit switched

network

6464kb/s based kb/s based circuit switched circuit switched

networknetworkPacket

switched network

Packet Packet switched switched networknetwork

Optical transmission

network

Optical Optical transmission transmission

networknetworkRadio

transmission network

Radio Radio transmission transmission

networknetwork

SDH VC-1n path networkSDH VCSDH VC--1n path network1n path network

Transport networkTransport network An exampleAn example

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It is classified broadly into three classes: It is classified broadly into three classes: circuit layer network, path layer network and circuit layer network, path layer network and transmission media layer networktransmission media layer network

The association between any two adjacent The association between any two adjacent layers is a client/sever associationlayers is a client/sever association

Each layer is independent to each other Each layer is independent to each other

Each layer has its own operations and Each layer has its own operations and maintenance capabilitymaintenance capability

Layering and PartitioningLayering and PartitioningTransportTransport layerlayer networksnetworks

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Circuit layer networks:Circuit layer networks:–– Circuit layer network provides users with Circuit layer network provides users with

telecommunications services such as circuit telecommunications services such as circuit switched services, packet switched services and switched services, packet switched services and leased line servicesleased line services. .

–– Different circuit layer network can be identified Different circuit layer network can be identified according to the services provided.according to the services provided.

–– Circuit layer network is independent of path layer Circuit layer network is independent of path layer networknetwork


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Path layer networksPath layer networks–– Path layer network is used to support different types Path layer network is used to support different types

of circuit layer networks.of circuit layer networks.

–– In the case of SDH, there are two path layer In the case of SDH, there are two path layer networks: networks: the lowerthe lower--order path layer networkorder path layer network and and the the higherhigher--order path layer networkorder path layer network..

–– The management control of the connectivity in path The management control of the connectivity in path layer networks is a key feature of SDH networks.layer networks is a key feature of SDH networks.

–– Path layer network is independent of transmission Path layer network is independent of transmission media layer network.media layer network.


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Transmission media layer networkTransmission media layer network–– Transmission media layer network is dependent on Transmission media layer network is dependent on

the transmission media such as fiber and radio.the transmission media such as fiber and radio.

–– Transmission media layer network can be divided Transmission media layer network can be divided into section layer networks and physical media layer into section layer networks and physical media layer networks.networks.

–– In case of SDH, there are two section layer In case of SDH, there are two section layer networks: a multiplex section layer network and a networks: a multiplex section layer network and a regenerator section layer network.regenerator section layer network.


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Layering and PartitioningLayering and PartitioningLayering Concept: Layering Concept: SDHSDH transporttransport layerlayer networksnetworks

PDH or ATM IP layer networkPDH or ATM IP layer network

VCVC--1111 VCVC--1212 VCVC--22 VCVC--33

VCVC--33 VCVC--44

Regenerator sectionRegenerator section

Physical media layerPhysical media layer

Circuit layerCircuit layer

Lower Lower orderorder

path layerpath layer

Higher Higher orderorder

path layerpath layer

Section Section layerlayer

PathPathlayerlayer

TransmissionTransmissionmediamedialayerlayer

Multiplex sectionMultiplex section

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☆☆ SDH network architecture SDH network architecture

☆☆ Topology of SDH networkTopology of SDH network☆☆ SelfSelf--healing ring planninghealing ring planning



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Topology of SDH NetworkTopology of SDH NetworkItIt’’s very important to design the physical s very important to design the physical transport network layout.transport network layout.Mesh ,ring and star are the most common Mesh ,ring and star are the most common arrangements to meet various degrees of the arrangements to meet various degrees of the traffic demand ,expected traffic growth and traffic demand ,expected traffic growth and traffic distribution.traffic distribution.Sometimes in a large system ,a combination of Sometimes in a large system ,a combination of these three types is used to form one or more these three types is used to form one or more layers of a hierarchical network.layers of a hierarchical network.

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Linear or Chain StructureLinear or Chain Structureusing TM and ADMusing TM and ADMThe simplest architecture of an SDH network is The simplest architecture of an SDH network is the point to point and linear networks where the point to point and linear networks where SDH line terminal equipment andSDH line terminal equipment and multiplexersmultiplexersare commonly used.are commonly used.

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Star StructureStar StructureHubbingHubbing nodes can be nodes can be used to interconnect used to interconnect multiple multiple topologies ,including topologies ,including multiple rings for traffic multiple rings for traffic grooming .grooming .Both ADM and DXC Both ADM and DXC equipment are commonly equipment are commonly applied at hub sites,but applied at hub sites,but DXCDXC hubbing hubbing is more is more flexible for it provides flexible for it provides rapid provisioning and rapid provisioning and bandwidth management.bandwidth management.

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Tree StructureTree StructureMultiplexersMultiplexers are are replaced with DXC replaced with DXC in point to point in point to point system,the system,the architecture architecture becomes more like becomes more like aa hubbinghubbingarchitecture .architecture .

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SelfSelf--healing Ring Structurehealing Ring StructureRing topology is Ring topology is very important for very important for SDH networks. SDH networks. Two complete Two complete jointed path jointed path between any two between any two nodes;nodes;SelfSelf--healing healing recovery recovery mechanisms.mechanisms.

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Mesh StructureMesh StructureAn ideal meshed network An ideal meshed network is defined as networks is defined as networks that have direct that have direct connections among all connections among all nodes.nodes.Meshed networks usually Meshed networks usually use DXC as the network use DXC as the network node elements .node elements .Such networks have a Such networks have a selfself--healing capability.healing capability.Meshed configuration is Meshed configuration is commonly adopted in commonly adopted in backbone ,national or backbone ,national or regional trunk networks.regional trunk networks.

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Advantages of meshed Advantages of meshed networknetwork

Better flexibility ;Better flexibility ;Ability to handle multiple failures including Ability to handle multiple failures including node and link failures;node and link failures;Minimum spare capacity associated with Minimum spare capacity associated with protection;protection;Maximized flexibility for rapid reconfiguration;Maximized flexibility for rapid reconfiguration;Economical for large demand and high Economical for large demand and high connectivity network.connectivity network.

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ContentContent

☆☆ Introduction of SDH network planningIntroduction of SDH network planning



☆☆ SelfSelf--healing ring planninghealing ring planning☆☆ SDH networking applicationSDH networking application


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Traffic Demand Pattern Traffic Demand Pattern

Uniform traffic patternUniform traffic pattern

Such as interSuch as inter--provincial provincial network traffic network traffic distribution.distribution.

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Traffic Demand Pattern Traffic Demand Pattern Neighboring traffic Neighboring traffic patternpattern

All traffic destined for All traffic destined for adjacent nodes only.adjacent nodes only.

Some inter Some inter ––city city network traffic network traffic distribution is similar distribution is similar to this pattern.to this pattern.

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Traffic Demand Model Traffic Demand Model Center traffic patternCenter traffic pattern

All traffic destined for All traffic destined for one node .one node .

Access network traffic Access network traffic pattern is usual like pattern is usual like this.this.

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1)(2

+−×

kNSTMk

KNSTMk )()1(2 −×−

Traffic Demand Model and Traffic Demand Model and Ring CapacityRing Capacity

STMSTM--N unidirectional path switched ring N unidirectional path switched ring –– the most capacity is STMthe most capacity is STM--N at any caseN at any case

TwoTwo--fiber MS shared protection ringfiber MS shared protection ring–– Center traffic pattern:STMCenter traffic pattern:STM--NN；；

–– Neighboring traffic pattern:Neighboring traffic pattern:（（K/2K/2））××(STM(STM--N)N)，，KK--node node numbernumber；；

–– Uniform traffic pattern:Uniform traffic pattern:kk--odd numberodd number；； kk--even numbereven number

FourFour--fiber MS shared protection ring ringfiber MS shared protection ring ring–– capacity is double of that of the twocapacity is double of that of the two--fiber MS ringfiber MS ring

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SDH Network RoutingSDH Network RoutingSONET/SDH rings are basic elements in most SONET/SDH rings are basic elements in most survivable network architectures. Designing and survivable network architectures. Designing and operating a single ring is simple. operating a single ring is simple. However, the design of the multiple interconnected However, the design of the multiple interconnected rings in a transport network is a very complex rings in a transport network is a very complex undertaking. Network planners must consider many undertaking. Network planners must consider many possible designs with numerous degrees of freedom possible designs with numerous degrees of freedom existing in each alternative. existing in each alternative. Furthermore, as competition between service providers Furthermore, as competition between service providers intensifies, network planners are under increasing intensifies, network planners are under increasing pressure to reduce planning cycle times and minimize pressure to reduce planning cycle times and minimize capital costs.capital costs.

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Ring Network with ChainsRing Network with Chains

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IntersectantIntersectant RingsRings

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Tangential RingsTangential Rings

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Mixed networkMixed network

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SDH Network RoutingSDH Network Routing

Length of the ring is less Length of the ring is less than 1200kmthan 1200km；；Nodes of ring Nodes of ring is between 3 and is between 3 and 1010。。Principle: try to get a traffic Principle: try to get a traffic balance balance

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Traffic Balance for BLSR 2F/4FTraffic Balance for BLSR 2F/4FWhen planning the network capacity, one When planning the network capacity, one important issue is the consideration of traffic important issue is the consideration of traffic balance .balance .ItIt’’s special in BLSR/2F and BLSR/4F s special in BLSR/2F and BLSR/4F rings ,because the capacity of the ring is rings ,because the capacity of the ring is determined by the highest demand among determined by the highest demand among node pairs in the ring.The binode pairs in the ring.The bi--directional ring directional ring allows traffic to be split and routed in different allows traffic to be split and routed in different directions on the ring.directions on the ring.

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ContentContent

☆☆ Introduction of SDH network planningIntroduction of SDH network planning




☆☆ SDH networking applicationSDH networking application☆☆ SDH networking evolutionSDH networking evolution

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SDH Network StructureSDH Network Structure

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SDH Network Structure SDH Network Structure

SDH MeshedCore

SDH AccessRings

SDH AccessRings

SDH Metro Rings

SDH Metro Rings

Client traffic mapped into PDH/SDH

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PC Phone Payphone 30B+D 2/4W VIF N×64Kb/s64Kb/s 2B+D E/M interface magnet interface RS232/485

GF155-03B/C

16

AN03D-R

AN03D-R

AN03D-R

1

AN03D - C

AN03W-C

V5P-02

LAN-E1

EthernetMANS2.0

STB

WRDSSAU

Wireless Digital expand frequency80km

AN03W-R

AN03W-R

1DS-CDMA20~50km

PON TDMA30 km

STM1/4 ODN

IBAS system

TV

PC

LAN

WRDS

IBAS system

LAN-E1

N-SW ATM- SW VODbusiness centerLeased line traffic DVB Video

Internet

GF9953-01

GF2488-01A

GF2488-01A

GF2488-01A

GF2488-01A

GF9953-01

DWDM(4-32xSTM-N)

STM-4

GF622-06

STM-16

STM-1GF155-03

SEMS2.0

DEMS2.0

Network solution of Network solution of fiberhomefiberhome

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TM TM

TM

ADMADM

ADM

ADM

TM

ADM

ADMADM

ADM

ADM

ADM

ADM 4/1

1/41/4

1/4

1/4

4/44/44/4

4/4

ADM

ADM

ADM

layer1 inter-provincial network

layer2 intra-provincial network

Layer3 inter-city network

SW SW SW

Layer4local networks

Hierarchical network of china Hierarchical network of china telcomtelcom

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The backbone of the China telecomThe backbone of the China telecom

Since 1999Since 1999，，interinter--provincial backbone are starting the provincial backbone are starting the deployment of DWDM system.deployment of DWDM system.DWDM productsDWDM products’’ manufacturers are:lucentmanufacturers are:lucent、、NECNEC、、AlcatelAlcatel、、NortelNortel、、fiberhome fiberhome 、、 huawei huawei etc.etc.G.655 fiber is adoptedG.655 fiber is adopted1010GbGb/s system/s systemThe problem exists in china telecom SDH transport The problem exists in china telecom SDH transport network network ：：–– Network management in a MultiNetwork management in a Multi--vender environmentvender environment–– Problems in network protection and restoration.Problems in network protection and restoration.

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ADM-16

ADM-16

ADM-16ADM-16

ADM-16

SDH环七36km

55km

83km

52km27km

36km

98km

12km

61km

ADM-16ADM-16

洞口E

武冈 CE

回龙寺

西岩

绥宁

石江山门

邓家铺

五一路SFC

ADM-16

50km新宁ADM-16

37km

城步

25km

ADM-16

武阳

ADM-16

高沙

ADM-16

ADM-16 41km

ADM-16

ADM-16

ADM-16

ADM-16ADM-16

ADM-16

ADM-16 ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16 ADM-16

ADM-16

ADM-16

ADM-16

ADM-16ADM-16

ADM-16

ADM-16

ADM-16

ADM-16ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16 ADM-16

ADM-16

ADM-16

ADM-16

REG-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-4

佘田桥

SDH环五

32km

52km

21km

4km

14km26km

21km

46km

36km

24km

21km

55km

新邵E

邵东C

水井头

陈家坊

寸石

新田铺

龙溪铺

界岭

仙槎桥

邮政局五一路SFC

SDH环六

37km

19km

33km

14km36km

26km

36km

26km

40km

39km

35km

五一路SFC

隆回E

横板桥

邵阳县C

白仓

五峰铺

九公桥

六都寨金石桥

高坪

滩头

SDH环三

10km

10km

10km

10km

10km

10km

10km

10km10km

10km

10km10km

樟树垅

龙须塘

火车站

遥临巷

城北路

宝庆西路S 市委

钢厂

红旗路人民巷

工业街

塔北南路五一路SFC

宝庆西路S

邵石路口

九江村翠园

三八亭观音庵

塔北路

城东

师专

江北市场

SDH环四

10km

10km

10km20km

10km

10km10km

10km

10km

10km

10km

10km

五一路SFC4km

武冈老局

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

ADM-16

TM-1

ADM-16

SDH环一

16km23km

49km

3km

10km

2km邵东C 宝庆西路S

新邵E

红旗路火厂坪

邵东老局廉桥

18km

37km

五一路SFC

4km五一路SFC

54km隆回E

59km洞口E

51km武冈

39km

96km邵阳县C

52km

新宁

62km

武冈EC57km

绥宁77km

城步

SDH环二

宝庆西路S

ADM-16

35km

下花桥

ADM-4

九龙岭

主网管

辅网管

22km黄桥

ADM-16

LANLAN

55

R8

2.5G调度环

长途局

R7水厂

荣华村

南垸

吴家山

台北路

营房村

时分复用设备

622M调度环2

常码头

唐家墩

台北路

常清花园

民权

路友谊路

营房村 R6

合作路

营房村

三阳路

江大路

黄浦路

长春路

TS3

R9十里铺

营房村妙

墩

洪山罗家路

长途局

长春

路东亭

洪山

R5汉南

神龙路

洪山

钟家村

十里铺

时分复用设备

622M调度环1

R3洪山

南湖

紫阳路

民主

路

积玉桥

徐东

路

R2中北

路

东亭

徐东路尤里

村

街道口

洪山

R4罗家路青山新

工人村

徐东路

洪山

R1

徐东路

关山新

鲁巷数据局

MANMAN

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Examples of network topology adopted by Examples of network topology adopted by some countriessome countries

Local network Local network ––STMSTM--1UPSR ring1UPSR ring

Central network Central network ––STMSTM--4/16 2/4 fiber 4/16 2/4 fiber BLSR ringBLSR ring

IndiaIndia

STMSTM--1/41/4MongoliaMongolia

STMSTM--1/41/4Bhutan Bhutan

STMSTM--1/41/4MyanmarMyanmar

SDH network capacitySDH network capacityAdministrationAdministration

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Development trend of networkDevelopment trend of network

Packet netPacket net

Circuit switch netCircuit switch net

data

voice

Packet netPacket net

Circuit switch netCircuit switch net

ATMATM

Transport networkTransport network

video

Last networkLast network Current networkCurrent network

Future network

voice

voice

data

data

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The development trend of SDHThe development trend of SDHCircuit exchange network would continue to Circuit exchange network would continue to develop in five yearsdevelop in five years；；SDH as a leading edge technology is still SDH as a leading edge technology is still evolvingevolving；；The future optical core network needs more The future optical core network needs more SDH access equipment;SDH access equipment;SDH is still the most survivable network SDH is still the most survivable network technology at present.technology at present.

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The development trend of SDHThe development trend of SDH1010GbGb/s SDH system has been matured.There /s SDH system has been matured.There are more and more TMs andare more and more TMs and ADMsADMs have been have been used. Some manufacturersused. Some manufacturers’’ laboratories have laboratories have developed 40Gb/s equipmentdeveloped 40Gb/s equipmentThe transmission experiments of 160Gb/s The transmission experiments of 160Gb/s ETDM and 640Gb/s OTDM have been ETDM and 640Gb/s OTDM have been developed successfully.developed successfully.SubSub--STMSTM--0 system has been standardized, 0 system has been standardized, SDH product is being used in access network .SDH product is being used in access network .

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The development trend of SDHThe development trend of SDH

Modern times

Telecommunication network

supported by

Computer-based integrated network

management and maintenance

Customer needs

Faster provisioning of circuits and services

Traditional timesTraditional times

PointPoint--toto--Point Point TransmissionTransmission

supported bysupported by

Manual approach to Manual approach to network network

management and management and maintenancemaintenance

Changing Network Requirements

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SDH FutureSDH Future

SDHSDH→→ MSTP MSTP →→ ASTN/ASONASTN/ASON(DWDM (DWDM →→ OTN OTN →→ ASTN/ASON)ASTN/ASON)

Core network Core network →→ Convergence network Convergence network →→Edge network Edge network

sdh planning

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