G.709中文翻译学习.docx

1 ScopeThe optical transport hierarchy (OTH) supports the operation and management aspects of opticalnetworks of various architectures, e.g., point-to-point, ring and mesh architectures.This Recommendation defines the interfaces of the optical transport network to be used within andbetween subnetworks of the optical network, in terms of:– optical transport hierarchy (OTH)– functionality of the overhead in support of multi-wavelength optical networks– frame structures– bit rates– formats for mapping client signals.光传送体系（OTH）支持不同架构的光网络的运营和管理，例如，点对点，环形和网状架构。该协议依据如下维度定义了光网络的接口的标准，该接口用于光网络子网内部及子网之间的通信。光传送体系（OTH）支持多波光网络的开销的功能帧结构Bit率客户信号映射格式The interfaces defined in this Recommendation can be applied at user-to-network interfaces (UNI)and network node interfaces (NNI) of the optical transport network. It is recognized, for interfacesused within optical subnetworks, that aspects of the interface are optical technology dependent andsubject to change as technology progresses. Therefore, optical technology dependent aspects (fortransverse compatibility) are not defined for these interfaces to allow for technology changes. Theoverhead functionality necessary for operations and management of optical subnetworks is defined.协议定义的接口，可以应用于光传送网络的用户网络接口（UNI）和网络节点接口（NNI）。对于光网络的子网的接口应用，某些方面是受限于科技进步的。所以，依赖于光科技的方面（横向兼容方面）是没有被定义的，从而允许随着科技进步进行改变。光网络子网操作及管理需要的开销功能同样被定义。The second revision of this Recommendation introduced:– support for an extended (unlimited) set of constant bit rate client signals;– a flexible ODUk, which can have any bit rate and a bit-rate tolerance up to ?100 ppm;– a client/server independent generic mapping procedure to map a client signal into thepayload of an OPUk, or to map an ODUj signal into the payload of one or more tributaryslots in an OPUk;– ODUk delay measurement capability.第二次修订的协议介绍了：支持一种扩展的CBR客户信号；ODUk flex，可以是任意bit率，bit率最大容忍?100 ppm；一种客户层与服务层独立的通用映射（GMP）步骤，将客户信号映射到OPUk的净和区，或者将一个ODUj信号映射到一个OPUk的一个或多个时隙的净和区；ODUk的延迟测量能力。The third revision of this Recommendati