High And Low Speed Sides On The Network

Fig 1: Identifying Block Diagram Of High And Low Speed CAN Network Zones

Courtesy of VOLVO CARS OF NORTH AMERICA.

The network consists of two parts: a high speed side (HS CAN) which transmits signals/messages between the central electronic module (CEM) and control modules mainly in the engine compartment, and a low speed side (LS CAN) which transmits signals/messages between the central electronic module (CEM) and control modules in the passenger compartment and the luggage compartment.

The interface between the high and low speed sides is supplied by the central electronic module (CEM) which converts the transmission speed up or down for communication between the two network sides.