本文档描述了11992系列中指定的两个基于CAN的网络接口的数据链路层（DLL）和物理层（PHY）。 DLL子条款包括: -DLL协议实体要求； -DLL设备接口要求；和 -DLL网络系统要求。 通常，物理信令子层在CAN协议控制器中实现。物理介质连接子层通常在CAN收发器或系统基芯片（SBC）中实现。可选地，它还可以包括额外的保护电路。媒体相关子层包括连接器和布线。 物理信号（PS）子条款包括: -PS实体要求； -PS设备接口要求；和 -PS网络系统要求。 物理介质附件（PMA）子条款包括: -PMA协议实体要求；和 -PMA设备接口要求。 物理介质相关（PMD）子条款包括: -PMD实体要求； -PMD设备接口要求；和 -PMD网络系统要求。

This document describes the data link layer (DLL) and physical layer (PHY) for the two CAN-based network interfaces specified in the 11992-series. The DLL sub-clauses are composed of: — DLL protocol entity requirements; — DLL device interface requirements; and — DLL network system requirements. Normally, the physical signalling sub-layer is implemented in the CAN protocol controller. The physical medium attachment sub-layer is normally implemented in the CAN transceiver or the System Base Chip (SBC). Optionally, it can comprise also additional protection circuitry. The media-dependent sub-layer comprises the connectors and the cabling. The physical signalling (PS) sub-clauses are composed of: — PS entity requirements; — PS device interface requirements; and — PS network system requirements. The physical medium attachment (PMA) sub-clauses are composed of: — PMA protocol entity requirements; and — PMA device interface requirements. The physical medium dependent (PMD) sub-clauses are composed of: — PMD entity requirements; — PMD device interface requirements; and — PMD network system requirements.