Network Design: Notes

WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2014 Volvo XC90, 2013 Volvo XC90, 2012 Volvo XC90, 2011 Volvo XC90, and 2010 Volvo XC90. However, it is still accessible from the selected car via links, so may be relevant.

GENERAL

Fig 1: Identifying MOST Network Control Modules (Up To Eight)

Courtesy of VOLVO CARS CORPORATION

Model year 2011-

Fig 2: Identifying MOST Network Control Modules (Up To Seven)

Courtesy of VOLVO CARS CORPORATION

The MOST network is an optical network in which all control modules included are connected in a ring. All messages in the MOST network travel in one and the same direction from the infotainment control module (ICM) to the integrated audio module (IAM).

In a fiber optic network, light pulses are transmitted instead of electrical signals. The light pulses are interpreted in the same way as the electrical signals on the CAN network.

The MOST network uses the master-slave concept. This means that a master control module, infotainment control module (ICM) has overall control of communication on the MOST network.

The fiber optic cable is made of plastic. Communication is using red light on a wavelength of 650 nm.