In-vehicle network system

An in-vehicle network system comprising:

• an upper device;
• a first intermediate device that is connected to the upper device directly or indirectly and is configured to communicate with the upper device using a first communication system;
• a second intermediate device that is connected to the upper device directly or indirectly and is configured to communicate with the upper device using a second communication system;
• a first lower device that is directly connected to the first intermediate device and is configured to communicate with the first intermediate device using the first communication system;
• and
• a second lower device that is directly connected to the second intermediate device, is configured to communicate with the second intermediate device using the second communication system, and performs a function equivalent to a function performed by the first lower device, wherein:
• the in-vehicle network system includes a plurality of the first intermediate devices and a plurality of the second intermediate devices,
• one of the first intermediate devices is disposed in one of four sections of a vehicle, the four sections being a right front section, a left front section, a right rear section, and a left rear section that are divided about a position in the vehicle at which the upper device is disposed;
• another one of the first intermediate devices is disposed in a second one of the four sections that is diagonal to the one of the four sections;
• each of the first intermediate devices disposed in the one of the four sections and in the second one of the four sections is connected to the upper device directly or indirectly and is configured to communicate with the upper device using the first communication system;
• one of the second intermediate devices is disposed in a third one of the four sections that is adjacent to the one of the four sections in a front-rear direction of the vehicle;
• another one of the second intermediate devices is disposed in a fourth one of the four sections that is adjacent to the one of the four sections in a right-left direction of the vehicle;
• and
• each of the second intermediate devices disposed in the third and fourth sections is connected to the upper device directly or indirectly, and is configured to communicate with the upper device using the second communication system.

An in-vehicle network system comprising:

• an upper device;
• a first intermediate device that is connected to the upper device directly or indirectly and is configured to communicate with the upper device using a first communication system;
• a second intermediate device that is connected to the upper device directly or indirectly and is configured to communicate with the upper device using a second communication system;
• a first lower device (i) that is directly connected to the first intermediate device and is configured to communicate with the first intermediate device using the first communication system, and (ii) that is directly connected to the second intermediate device and is configured to communicate with the second intermediate device using the second communication system;
• a third intermediate device that is connected to the upper device directly or indirectly and is configured to communicate with the upper device using the first communication system;
• a fourth intermediate device that is connected to the upper device directly or indirectly and is configured to communicate with the upper device using the second communication system;
• a second lower device that is directly connected to the third intermediate device and is configured to communicate with the third intermediate device using the first communication system;
• and
• a third lower device that is directly connected to the fourth intermediate device, is configured to communicate with the fourth intermediate device using the second communication system, and performs a function equivalent to a function performed by the second lower device,
• wherein:
• each of the first intermediate device and the third intermediate device is a first device;
• each of the second intermediate device and the fourth intermediate device is a second device;
• one of the first devices is disposed in one of four sections of a vehicle, the four sections being a right front section, a left front section, a right rear section, and a left rear section that are divided about a position in the vehicle at which the upper device is disposed;
• another one of the first devices is disposed in a second one of the four sections that is diagonal to the one of the four sections;
• each of the first devices disposed in the one of the four sections and in the second one of the four sections is connected to the upper device directly or indirectly and is configured to communicate with the upper device using the first communication system;
• one of the second devices is disposed in a third one of the four sections that is adjacent to the one of the four sections in a front-rear direction of the vehicle;
• and
• another one of the second devices is disposed in a fourth one of the four sections that is adjacent to the one of the four sections in a right-left direction of the vehicle;
• and
• each of the second devices disposed in the third and fourth sections is connected to the upper device directly or indirectly, and is configured to communicate with the upper device using the second communication system.