OTN学习笔记
1、The optical transport hierarchy (OTH) supports the operation and management aspects of optical networks of various architectures, e.g., point-to-point, ring and mesh architectures.
This Recommendation defines the interfaces of the optical transport network to be ud within and
between 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.
光传送序列（OTH）支持各种体系结构（即点对点、环形和网孔形体系结构）光网络的运行和管理夏朝文物
。
依据光传送序列（OTH）、多波长光网络支持中的开销功能、帧结构比特率及映射客户信号的方式，本建议定义了光传送网络的接口，以便将这些接口用于光网络的子网内部和子网之间。
2、optical transport module (OTM-n.m): The OTM is the information structure that is transported across an ONNI. The index n and m define the number of supported wavelengths and bit rates at the interface. Two OTM structures are defined:
The OTM with full functionality (OTM-n.m) is the information structure ud to support optical transmission ction (OTS) layer connections in the OTN. The characteristic information of the optical transmission ction layer (OTS_CI) consists of information payload (OTS_CI_PLD) and optical transmission ction overhead information fields (OTS_CI_OH). The optical transmission ction overhead (OTS_OH) information fields are contained within the OTM overhead signal (OOS) information structure. The OTM-n.
m consists of up to n multiplexed optical channels and an OTM overhead signal to support the non-associated overhead.
The OTM with reduced functionality (OTM-nr.m/OTM-0) is the information structure ud to support optical physical ction (OPS) layer connections in the OTN. The characteristic information of the optical physical ction layer (OPS_CI) consists of information payload (OPS_CI_PLD). OTM-0 consists of a single optical channel without a specific colour assigned. The OTM-nr.m consists of up to n multiplexed optical channels. Non-associated overhead is not supported
光传送模块（OTM）：OTM是穿越ONNI传送的信息结构。n和m定义了接口支持的波长数量和比特率。定义了两种OTM：完全功能OTM（OTM-n.m）和简化功能OTM（OTM-0和OTM-nr.m）。
完全功能OTM（OTM-n.m）是用于支持OTN中光传输段（OTS）层连接的信息结构。光传输段层的特征信息（OTS_CI）由信息净荷（OTS_CI_PLD）和光传输段开销信息（OTS_CI_OH）组成。光传输段开销（OTS_OH）信息包含在OTM开销信号（OOS）信
息结构中。为了支持非联合开销，完全功能OTM-n.m由最多n个复用的光信道和一个OTM开销构成。
简化功能OTM（OTM-nr.m/OTM-0）是用于支持OTN中光物理段（OPS）层连接的信息结构。光物理段层的特征信息（OPS_CI）由信息净荷（OPS_CI_PLD）组成。OTM-0由不具有分配特定颜色的单个光信道构成。OTM-nr.m最多由n个复用光信道组成。不支持非联合开销。
3、optical channel (OCh[r]): The OCh is the information structure ud to support the OCh
trail. Two OCh structures are defined.
The OCh client signals defined in this Recommendation are the OTUk signals. Other digital client
signals (e.g., STM-n, GbE) may be supported by the OTM.
Optical channel with full functionality (OCh): The OCh is an information structure consisting of the information payload (OCh_PLD) with a certain bandwidth and non-associated overhead (OCh_OH) for management of the optical channel.
Optical channel with reduced functionality (OChr): The OChr is an information structure consisting of the information payload (OCh_PLD) with a certain bandwidth. Non-associated overhead is not supported.
光信道（OCh）：OCh是用于支持OCh踪迹的信号结构。定义了两种结构的OCh。
本建议中定义的OCh客户信号为OTUk信号。可以通过OTM支持其他数字客户信号（即STM-n和GbE）。
完全功能光信道（OCh）：为了管理光信道，OCh是一种由具有特定带宽和非联合开销（OCh_OH）的、信息净荷（OCh_PLD）组成的信息结构。
简化功能光信道（OChr）：OChr是一种由环卫工作
具有特定带宽的、信息净荷组成的信息结构。不支持非联合开销。
4、optica疫情中的我
l channel transport unit (OTUk[V]): The OTUk is the information structure ud for transport of an ODUk over one or more optical channel connections. It consists of the optical channel data unit and OTUk related overhead (FEC and ov化学工程与工艺
erhead for management of an optical channel connection). It is characterized by its frame structure, bit rate, and bandwidth. Two versions of the OTUk are defined:
Completely standardized OTUk (OTUk): The completely standardized OTUk is ud on OTM IrDIs and may be ud on OTM IaDIs. Functionally standardized OTUk (OTUkV): The partly standardized OTUk is ud on OTM IaDIs.
光信道传送单元（OTUk）：OTUk是为了在一个或多个光信道连接上进行光信道数据单元（ODUk）传送的信息结构。它由ODUk和OTUk相关开销（用于光信道连接的FEC和开销）组成。它由其帧结构、比特率及带宽规范。定义了两种版本的OTUk。
完全标准化OTUk（OTUk）：完全标准化OTUk可以用于OTM IrDIs和OTM IaDIs。
功能标准化OTUk（OTUkV）：部分标准化OTUk用于OTM IaDIs。
5、optical channel payload unit (OPUk): The OPUk is the information structure ud to adapt client information for transport over an optical channel. It compris client information together with any overhead needed to perform rate adaptation between the client signal rate and the OPUk payload rate and other OPUk overhead supporting the client signal transport. This overhead is adaptation specific.
