本文翻译了AMWA对于NMOS的术语表，供大家更好的理解NMOS中各个参数的定义。
原文链接： https://specs.amwa.tv/nmos/branches/main/docs/Glossary.html

NMOS 术语表

In NMOS specs several common terms have specific meanings that you should be aware of. Many of these correspond to the glossary of the JT-NM Reference Architecture.

在 NMOS 规范中，您应该注意几个常用术语的特定含义。其中许多对应于JT-NM 参考架构的词汇表。

Several of these are formally defined in NMOS specs, but are described here for convenience.

其中一些已在 NMOS 规范中正式定义，但为了方便起见，在此处进行了描述。

Device

A Device is a logical block of functionality within a networked media infrastructure. Example of Devices could include:

设备是网络媒体基础设施内的逻辑功能块。设备示例可能包括：

• Camera
• SDI to IP adapter
• Chroma keyer
• Audio mixer

A Device may have a permanent presence on its Node (Fixed Device, e.g., a networked camera), or it may be created on demand by its Node (Virtual Device, e.g., a software-based transcoder). Nodes may dynamically create different types of Device (Dynamic Device).

设备可以在其节点上永久存在（固定设备，例如联网摄像机），或者可以由其节点（虚拟设备，例如基于软件的转码器）按需创建。节点可以动态创建不同类型的设备（Dynamic Device）。

Flow

In the IS-04 and IS-05 specifications a Flow refers to a sequence of video, audio or time-related data. This is a relatively high-level usage of the word, and should not be confused with a low-level flow within the physical network.

在 IS-04 和 IS-05 规范中，流是指视频、音频或时间相关数据的序列。这是该词的相对高级用法，不应与物理网络内的低级流混淆。

Grain

NMOS specifications use Grain as a convenient way of identifying a unit of video, audio or time-related data. This helps with mapping NMOS’s logical data model onto physical Specifications. For example a frame of video may correspond to a VideoGrain.

NMOS规范使用Grain作为识别视频、音频或时间相关数据单元的便捷方式。这有助于将 NMOS 的逻辑数据模型映射到物理规范。例如，一帧视频可以对应一个 VideoGrain。

Node

A Node is a logical host for Devices. This can be physical, or virtual (and a Node can be within a “cluster” or “cloud”).

节点是设备的逻辑主机。这可以是物理的，也可以是虚拟的（节点可以位于“集群”或“云”中）。

Receiver

A Receiver consumes a Flow from a Sender.

接收者消费来自发送者的流。

Sender

A Sender makes a Flow available on the network

发件人使流在网络上可用

Source

A Source represents the logical primary origin of one or more Flows.

Note that (despite its name) a Source is:

• NOT a Device from which the content originates (for example there might be video, audio and perhaps data Sources associated with a camera, the camera itself is NOT a Source).
• NOT about the physical origin of the Flows (for example: two Flows associated with the same Source might physically originate from different hardware in distinct geographical locations)

源代表一个或多个流的逻辑主要来源。
请注意（尽管它的名字）一个来源是：

• 不是内容来源的设备（例如，可能有视频、音频和可能与相机相关联的数据源，相机本身不是源）。
• 与流的物理来源无关（例如：与同一源关联的两个流可能在物理上源自不同地理位置的不同硬件）

附一： NMOS各个字段定义逻辑图如下

附二： NMOS中包含的各个规范