本文件规定了与MOST数据链路层功能相关的技术要求。 MOST网络由两个或多个通过物理层连接的节点组成。数据链路层功能由每个节点提供。在每个网络上，所有节点都是同步的，一个节点提供系统时钟。此节点是TimingMaster，而所有其他节点都是TimingSlave。节点的定时配置（定时主节点或定时从节点）决定了需要在数据链路层上执行的任务。 数据链路层指定以下主题: -与网络层的服务接口； -网络框架、区域和指标； -不同的网络渠道； -不同的流量控制机制； -负载自适应仲裁和循环仲裁； -不同的寻址选项； -不同的循环冗余校验、它们的用法和CRC确认； -框架指示器。

This document specifies technical requirements related to the MOST data link layer functionality. A MOST network is comprised of two or more nodes connected through a physical layer. The data link layer functionality is provided by each node. On each network, all nodes are synchronised and one node provides the system clock. This node is the TimingMaster, while all other nodes are TimingSlaves. The timing configuration of the node (TimingMaster or TimingSlave) determines the tasks that need to be performed on the data link layer. The data link layer specifies the following subjects: — the service interface to the network layer; — the network frame, its areas and indicators; — the different network channels; — the different flow control mechanisms; — the load-adaptive arbitration and the round-robin arbitration; — the different addressing options; — the different cyclic redundancy checks, their usage and the CRC acknowledge; — the frame indicators.