随着数据业务的爆炸式增长,如何在光网络中有效地利用宝贵的带宽资源已经成为研究人员所关注的焦点。基于时间分配带宽业务(SBS)是自动交换光网络(ASON)中的一种新型业务,可以被认为是传统的按需分配带宽(Bandwidth on De-mand,BoD)业...随着数据业务的爆炸式增长,如何在光网络中有效地利用宝贵的带宽资源已经成为研究人员所关注的焦点。基于时间分配带宽业务(SBS)是自动交换光网络(ASON)中的一种新型业务,可以被认为是传统的按需分配带宽(Bandwidth on De-mand,BoD)业务的一种具体实现,SBS的出现既可以有效地为运营商节省宝贵的带宽资源,又可以降低用户的成本开销。文章从管理模型、实现方法以及社会价值等几个方面对SBS进行了详细的描述。展开更多
A dynamic Optical Transport Network (OTN) has the advantage of being able to adjust the connection capacity on demand in order to respond to variations on traffic patterns or to network failures. This feature has the ...A dynamic Optical Transport Network (OTN) has the advantage of being able to adjust the connection capacity on demand in order to respond to variations on traffic patterns or to network failures. This feature has the potential to reduce operational costs and at the same time to optimize networks resources. Virtual Concatenation (VCAT) and Link Capacity Adjustment Scheme (LCAS) are two techniques that when properly combined can be used to provide improved dynamism in OTN networks. These techniques have been previously standardized in the context of Next Generation SDH/SONET networks. VCAT is used to tailor the capacity of network connections according to service requirements, while LCAS can adjust dynamically that capacity in a hitless manner. This paper presents an overview of the application of VCAT/LCAS techniques in the context of OTN. It explains in detail how these techniques can be employed to resize the connection capacity and analyses its use in network protection solutions. Furthermore, a detailed analysis of the time delays associated with different operations is provided and its application to some reference networks is undertaken. The obtained results provide an idea about the time delays of the capacity adjustment processes and define potential scenarios for implementing VCAT/LCAS techniques.展开更多
文摘随着数据业务的爆炸式增长,如何在光网络中有效地利用宝贵的带宽资源已经成为研究人员所关注的焦点。基于时间分配带宽业务(SBS)是自动交换光网络(ASON)中的一种新型业务,可以被认为是传统的按需分配带宽(Bandwidth on De-mand,BoD)业务的一种具体实现,SBS的出现既可以有效地为运营商节省宝贵的带宽资源,又可以降低用户的成本开销。文章从管理模型、实现方法以及社会价值等几个方面对SBS进行了详细的描述。
文摘A dynamic Optical Transport Network (OTN) has the advantage of being able to adjust the connection capacity on demand in order to respond to variations on traffic patterns or to network failures. This feature has the potential to reduce operational costs and at the same time to optimize networks resources. Virtual Concatenation (VCAT) and Link Capacity Adjustment Scheme (LCAS) are two techniques that when properly combined can be used to provide improved dynamism in OTN networks. These techniques have been previously standardized in the context of Next Generation SDH/SONET networks. VCAT is used to tailor the capacity of network connections according to service requirements, while LCAS can adjust dynamically that capacity in a hitless manner. This paper presents an overview of the application of VCAT/LCAS techniques in the context of OTN. It explains in detail how these techniques can be employed to resize the connection capacity and analyses its use in network protection solutions. Furthermore, a detailed analysis of the time delays associated with different operations is provided and its application to some reference networks is undertaken. The obtained results provide an idea about the time delays of the capacity adjustment processes and define potential scenarios for implementing VCAT/LCAS techniques.
