BS ISO 11992-1:2019

This standard BS ISO 11992-1:2019 Road vehicles. Interchange of digital information on electrical connections between towing and towed vehicles is classified in these ICS categories:

• 43.040.15 Car informatics. On board computer systems

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.