Chinese
English
I. Multi-service and Intelligent is the Inevitable Trend of Optical Network Development
With the rapid growth of 3G, SAN, digital TV and other broadband data services and leased line rental services, the demand for network bandwidth is not only becoming larger and larger, but also due to the uncertainty and unpredictability of the volume of the data service itself, the dynamic allocation of network bandwidth requirements are also becoming more and more urgent, in addition to the consideration of the problem of return on profits, the operators hope to reduce operating costs and provide value-added services.
The emergence of multi-service platform MSTP meets the access and transmission requirements of multi-services; the progress of DWDM in transmission distance and wavelength multiplexing technology has largely alleviated the bandwidth tension. But how to solve the fast, dynamic, SLA-graded transmission management of multi-service? In order to solve these problems, network intelligence has become an inevitable part of optical network development.
The introduction of intelligent features can bring the following benefits to the optical network:
- Flexible network structure: mesh networking, which can realize infinite expansion of the network and support multi-service hierarchy;
- Rapid service provisioning: automatic discovery and inventory management, circuit auto-configuration, greatly shortening the service provisioning time, dynamic allocation of bandwidth, and resource utilization rate Higher;
Value-added service platform: fast response to new services; signaling interoperability: interoperability of different vendors, interoperability of different networks.
Standards and Architecture of Intelligent Optical Networks
The application scale of intelligent optical networks is closely related to the degree of standardization. iTU-T, IETF, OIF and other standards organizations are actively promoting the standardization process of intelligent optical networks. itu-T defines the basic structure and requirements of ASON, and currently GMPLS has become the most important standard of ASON. ITU-T defines the basic structure and requirements of ASON, and GMPLS has become the mainstream standard of ITU-T; IETF defines the protocol GMPLS to meet the basic structure and requirements of ASON, and stipulates the signaling, link management, routing, and SDH/SONET support; OIF is committed to promoting the interoperability of equipment from different vendors, and focuses on the standardization of series interfaces such as UNI, E-NNI, and E-SONET, and is now actively promoting the standardization of intelligent optical networks. NNI standardization, UNI1.0/2.0 has been released, the external inter-network interface E-NNI has not yet formed a standard.
Intelligent optical network is the most basic characteristics of the traditional transmission plane and management plane, based on the increase in the control plane, an independent control plane to support a variety of control operations, such as restoration and protection, rapid configuration, fast access to and removal of network elements, etc., the control plane is the intelligent optical network is different from the general optical network of the unique place.
III. Evolution of Intelligent Optical Networks
1. Evolution of Network Equipment
Optical networks have evolved from PDH to SDH, and transmission networks have taken a big step forward in terms of networking capability, security and standardization. Traditional SDH is based on TDM transmission and network management, and the basic equipment forms are ADM and MADM; the emergence of MSTP and the extensive use of WDM push the transmission capacity of optical networks to one peak after another, and the desire to establish a unified service bearing network has been getting closer and closer to us, accompanied by the mature application of data service oriented standards such as GFP, VCAT, LCAS, and so on, on MSTP, MSTP has become the most important network equipment for data services. With the mature application of GFP, VCAT, LCAS and other data service-oriented standards on the MSTP, MSTP has become the first choice for the construction of the current optical network; in addition, with the development of data services, in the face of the rapid, efficient, dynamic characteristics of the control and management of the transmission network has always been the soft underbelly of the development - until the emergence of intelligent optical networks. The emergence of intelligent optical networks is to establish a maximum automation of the transmission network, thereby reducing the OPEX (operating costs) of the network. In terms of the development of intelligent optical networks, high-capacity intelligent optical networks (such as Huawei's OSN9500) are already realistic product-level systems. It can be predicted that the application of intelligent optical networks is an irreversible trend in the coming years.
2. Evolution of Network Form
The network form of traditional MANs is dominated by chain and ring networking, and Mesh networks have long been unappreciated due to the disadvantages of complex networking form and expensive networking equipment.
However, with the rapid growth of broadband data services, the result of line capacity enhancement makes the ratio of node (crossover) and line (optical interface + optical amplifier) costs lower, and the high capacity utilization of Mesh network is more conducive to saving the cost of the network; in addition, more importantly, the introduction of the distributed control plane can realize distributed Mesh recovery, reducing the service recovery time; finally, from the perspective of the ROI, with the introduction of telecommunication, Mesh network is more suitable to save the cost of the network. Finally, from the perspective of return on investment, with the decline of the telecom market, operators pay more attention to reducing operating costs.
It can be said that in the stage of intelligent optical network, network equipment should first have the ability of mesh networking, mesh network provides path recovery and link protection two protection modes to make the network survivability and security is improved.
3. ASON network evolution
ASON technology will first be applied to the long-haul transmission network and metropolitan backbone transmission network, with the network as well as business scheduling and management needs of the growth, and gradually to the metropolitan area aggregation and access network level, and ultimately to achieve network-wide intelligence.
For long-haul transmission network, since most of the current ring network, the ring is longer, the probability of two-point failure or multi-point failure is greater, so you can introduce ASON technology to enhance the network's survivability, and at the same time improve the end-to-end scheduling capabilities, and to provide differentiated long-haul transmission services. Generally speaking, in the long-distance transmission network building ideas, build ASON network is a single-domain sub-network, there will not be more than one sub-network, the introduction of sub-networks mainly lies in the purpose of the network can not contain too many nodes, the second is due to the different manufacturers from different manufacturers, and the third is the problem of the different operators for the long-distance on the ASON network, the network nodes are generally not too many, and the operators are certainly their own network, and it is unlikely that the use of Different manufacturers of equipment to build the backbone of the ASON network.
As for the metropolitan transmission network, due to the frequent circuit scheduling in the metropolitan area network, the higher requirements of the opening time, the dynamic nature of the data service and other characteristics, coupled with the metropolitan area network is the focus of the current network construction, so the metropolitan area optical network objectively exists in the introduction of the demand for ASON. In terms of metro evolution strategy, ASON can be introduced in the metro backbone layer first, and then gradually extended to the aggregation layer and access layer, and ultimately realize end-to-end ASON network.
Of course, in the introduction of ASON at the same time, the following issues must be resolved:
1. How to achieve end-to-end configuration with the traditional optical network
There are already a large number of traditional optical transmission equipment in the existing network, the introduction of new intelligent optical network equipment must be seamlessly integrated with the traditional network, in order to effectively protect the existing investment under the premise of the gradual evolution to ASON. In order to better realize the end-to-end fast service configuration, if it is divided into different manufacturers of intelligent and non-intelligent sub-domain network, a more realistic approach is to build a new ASON network with the traditional network management through the UNI standard interface to achieve docking. This requires that the legacy network management be upgraded to support the standard UNI interface. In case of intelligent and non-intelligent sub-domain networks of the same manufacturer, the possible way is to realize management through centralized network management or with the help of intelligent agents.
2. Stability and security of the network
The security and stability of the network does not depend on the control software. there is a requirement for intelligent optical networks that the services of the transmission plane cannot be affected by the failure of the control plane itself. and of course the control plane can lead to problems with protection and recovery if it has problems. In the early stages of ASON deployment of a longer period of time, the equipment is required to have the ability to do so, the traditional static configuration of services and ASON established dynamic services can coexist in order to adapt to the smooth evolution of the ASON network. In distributed networks, concurrent operations can easily lead to synchronization and preemption problems of resources; therefore, an effective coordination mechanism for resource competition must be established.
IV. Huawei OSN Intelligent Optical Network Evolution
Huawei OSN series products are all designed for intelligent optical networks to fully support the development of future services. which includes intelligent optical switching equipment OSN9500 and intelligent MSTP equipment OSN3500/OSN2500/OSN1500.
The OSN series is associated with the traditional MSTP equipment Metro5000, Metro3000, Metro1000 can realize unified service interaction and network management. One realization scheme is based on the integration of NMS, the intelligent subdomain composed of OSN products and the non-intelligent subdomain composed of MSTP can be centralized routing processed according to the single domain of NMS, which maintains the whole network routing information and makes centralized routing process for end-to-end services, and the intelligent subdomain can impose the mesh protection and recovery mechanism.
The backbone layer is concerned about service channeling and network security, so the backbone layer takes the lead in introducing intelligent optical networks. With the diversification of services and the demand for convergent transmission of services, the edge layer pays attention to multi-service bearing and bandwidth efficiency, so the edge layer firstly solves the problem of multi-service connectivity; secondly, it adopts MPLS to realize the dynamic transmission of data services; and finally superimposes the intelligent platform to realize the dynamic transmission of multi-services and the effective use of bandwidth resources, and realizes the real interaction between the customer and the network through the UNI interface.
With the rapid growth of 3G, SAN, digital TV and other broadband data services and leased line rental services, the demand for network bandwidth is not only becoming larger and larger, but also due to the uncertainty and unpredictability of the volume of the data service itself, the dynamic allocation of network bandwidth requirements are also becoming more and more urgent, in addition to the consideration of the problem of return on profits, the operators hope to reduce operating costs and provide value-added services.
The emergence of multi-service platform MSTP meets the access and transmission requirements of multi-services; the progress of DWDM in transmission distance and wavelength multiplexing technology has largely alleviated the bandwidth tension. But how to solve the fast, dynamic, SLA-graded transmission management of multi-service? In order to solve these problems, network intelligence has become an inevitable part of optical network development.
The introduction of intelligent features can bring the following benefits to the optical network:
- Flexible network structure: mesh networking, which can realize infinite expansion of the network and support multi-service hierarchy;
- Rapid service provisioning: automatic discovery and inventory management, circuit auto-configuration, greatly shortening the service provisioning time, dynamic allocation of bandwidth, and resource utilization rate Higher;
Value-added service platform: fast response to new services; signaling interoperability: interoperability of different vendors, interoperability of different networks.
Standards and Architecture of Intelligent Optical Networks
The application scale of intelligent optical networks is closely related to the degree of standardization. iTU-T, IETF, OIF and other standards organizations are actively promoting the standardization process of intelligent optical networks. itu-T defines the basic structure and requirements of ASON, and currently GMPLS has become the most important standard of ASON. ITU-T defines the basic structure and requirements of ASON, and GMPLS has become the mainstream standard of ITU-T; IETF defines the protocol GMPLS to meet the basic structure and requirements of ASON, and stipulates the signaling, link management, routing, and SDH/SONET support; OIF is committed to promoting the interoperability of equipment from different vendors, and focuses on the standardization of series interfaces such as UNI, E-NNI, and E-SONET, and is now actively promoting the standardization of intelligent optical networks. NNI standardization, UNI1.0/2.0 has been released, the external inter-network interface E-NNI has not yet formed a standard.
Intelligent optical network is the most basic characteristics of the traditional transmission plane and management plane, based on the increase in the control plane, an independent control plane to support a variety of control operations, such as restoration and protection, rapid configuration, fast access to and removal of network elements, etc., the control plane is the intelligent optical network is different from the general optical network of the unique place.
III. Evolution of Intelligent Optical Networks
1. Evolution of Network Equipment
Optical networks have evolved from PDH to SDH, and transmission networks have taken a big step forward in terms of networking capability, security and standardization. Traditional SDH is based on TDM transmission and network management, and the basic equipment forms are ADM and MADM; the emergence of MSTP and the extensive use of WDM push the transmission capacity of optical networks to one peak after another, and the desire to establish a unified service bearing network has been getting closer and closer to us, accompanied by the mature application of data service oriented standards such as GFP, VCAT, LCAS, and so on, on MSTP, MSTP has become the most important network equipment for data services. With the mature application of GFP, VCAT, LCAS and other data service-oriented standards on the MSTP, MSTP has become the first choice for the construction of the current optical network; in addition, with the development of data services, in the face of the rapid, efficient, dynamic characteristics of the control and management of the transmission network has always been the soft underbelly of the development - until the emergence of intelligent optical networks. The emergence of intelligent optical networks is to establish a maximum automation of the transmission network, thereby reducing the OPEX (operating costs) of the network. In terms of the development of intelligent optical networks, high-capacity intelligent optical networks (such as Huawei's OSN9500) are already realistic product-level systems. It can be predicted that the application of intelligent optical networks is an irreversible trend in the coming years.
2. Evolution of Network Form
The network form of traditional MANs is dominated by chain and ring networking, and Mesh networks have long been unappreciated due to the disadvantages of complex networking form and expensive networking equipment.
However, with the rapid growth of broadband data services, the result of line capacity enhancement makes the ratio of node (crossover) and line (optical interface + optical amplifier) costs lower, and the high capacity utilization of Mesh network is more conducive to saving the cost of the network; in addition, more importantly, the introduction of the distributed control plane can realize distributed Mesh recovery, reducing the service recovery time; finally, from the perspective of the ROI, with the introduction of telecommunication, Mesh network is more suitable to save the cost of the network. Finally, from the perspective of return on investment, with the decline of the telecom market, operators pay more attention to reducing operating costs.
It can be said that in the stage of intelligent optical network, network equipment should first have the ability of mesh networking, mesh network provides path recovery and link protection two protection modes to make the network survivability and security is improved.
3. ASON network evolution
ASON technology will first be applied to the long-haul transmission network and metropolitan backbone transmission network, with the network as well as business scheduling and management needs of the growth, and gradually to the metropolitan area aggregation and access network level, and ultimately to achieve network-wide intelligence.
For long-haul transmission network, since most of the current ring network, the ring is longer, the probability of two-point failure or multi-point failure is greater, so you can introduce ASON technology to enhance the network's survivability, and at the same time improve the end-to-end scheduling capabilities, and to provide differentiated long-haul transmission services. Generally speaking, in the long-distance transmission network building ideas, build ASON network is a single-domain sub-network, there will not be more than one sub-network, the introduction of sub-networks mainly lies in the purpose of the network can not contain too many nodes, the second is due to the different manufacturers from different manufacturers, and the third is the problem of the different operators for the long-distance on the ASON network, the network nodes are generally not too many, and the operators are certainly their own network, and it is unlikely that the use of Different manufacturers of equipment to build the backbone of the ASON network.
As for the metropolitan transmission network, due to the frequent circuit scheduling in the metropolitan area network, the higher requirements of the opening time, the dynamic nature of the data service and other characteristics, coupled with the metropolitan area network is the focus of the current network construction, so the metropolitan area optical network objectively exists in the introduction of the demand for ASON. In terms of metro evolution strategy, ASON can be introduced in the metro backbone layer first, and then gradually extended to the aggregation layer and access layer, and ultimately realize end-to-end ASON network.
Of course, in the introduction of ASON at the same time, the following issues must be resolved:
1. How to achieve end-to-end configuration with the traditional optical network
There are already a large number of traditional optical transmission equipment in the existing network, the introduction of new intelligent optical network equipment must be seamlessly integrated with the traditional network, in order to effectively protect the existing investment under the premise of the gradual evolution to ASON. In order to better realize the end-to-end fast service configuration, if it is divided into different manufacturers of intelligent and non-intelligent sub-domain network, a more realistic approach is to build a new ASON network with the traditional network management through the UNI standard interface to achieve docking. This requires that the legacy network management be upgraded to support the standard UNI interface. In case of intelligent and non-intelligent sub-domain networks of the same manufacturer, the possible way is to realize management through centralized network management or with the help of intelligent agents.
2. Stability and security of the network
The security and stability of the network does not depend on the control software. there is a requirement for intelligent optical networks that the services of the transmission plane cannot be affected by the failure of the control plane itself. and of course the control plane can lead to problems with protection and recovery if it has problems. In the early stages of ASON deployment of a longer period of time, the equipment is required to have the ability to do so, the traditional static configuration of services and ASON established dynamic services can coexist in order to adapt to the smooth evolution of the ASON network. In distributed networks, concurrent operations can easily lead to synchronization and preemption problems of resources; therefore, an effective coordination mechanism for resource competition must be established.
IV. Huawei OSN Intelligent Optical Network Evolution
Huawei OSN series products are all designed for intelligent optical networks to fully support the development of future services. which includes intelligent optical switching equipment OSN9500 and intelligent MSTP equipment OSN3500/OSN2500/OSN1500.
The OSN series is associated with the traditional MSTP equipment Metro5000, Metro3000, Metro1000 can realize unified service interaction and network management. One realization scheme is based on the integration of NMS, the intelligent subdomain composed of OSN products and the non-intelligent subdomain composed of MSTP can be centralized routing processed according to the single domain of NMS, which maintains the whole network routing information and makes centralized routing process for end-to-end services, and the intelligent subdomain can impose the mesh protection and recovery mechanism.
The backbone layer is concerned about service channeling and network security, so the backbone layer takes the lead in introducing intelligent optical networks. With the diversification of services and the demand for convergent transmission of services, the edge layer pays attention to multi-service bearing and bandwidth efficiency, so the edge layer firstly solves the problem of multi-service connectivity; secondly, it adopts MPLS to realize the dynamic transmission of data services; and finally superimposes the intelligent platform to realize the dynamic transmission of multi-services and the effective use of bandwidth resources, and realizes the real interaction between the customer and the network through the UNI interface.
Author：Huawei Technologies Limited Mou Jianhong Source：People's Posts and Telecommunications News
Sales SDH transmission equipment_Product Quotation_Sales Manufacturer_Product Characteristics_Product Description_Huawei SDH transmission equipment sales
Supply SDH transmission equipment_Troubleshooting_Installation and testing_Technical indicators_Technical parameters_Huawei SDH transmission equipment sales
