Basics of Automotive Ethernet Episode 3 How to use a media converter

Narrow down by specifying conditions

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basic interface board

Introduction

So far, we have introduced the in-vehicle Ethernet PHY and Switch through Episodes 1 and 2. This time, we will describe how to use the media converter sold by our company, which is used for evaluating PHY/Switch.

Actual use example

In the case of an ECU with PHY, one-to-one communication is evaluated.
In the case of an ECU equipped with Switch, a media converter is used, and the number of ports is prepared, and the operation check of arbitrary routing is evaluated.
By using a media converter, it is possible to evaluate using a 100BASE-TX/1000BASE-T compatible evaluation machine or PC.

Specifications and usage of each mode

Auto negotiation, Speed, Master, Slave — housing panel

The specifications of each switch are as follows.

A: Auto negotiation ON : Enabled OFF : Disabled

S : Speed ON : 1000M (100/1000M when Auto negotiation is enabled) OFF : 100M

M : Master/Slave ON : Master OFF : Slave

Auto negotiation disabled

The use cases when Auto negotiation is disabled are as follows: Link up will not occur if the speeds do not match, or if masters are connected or slaves are connected.

Behavior when Auto negotiation is disabled

Auto negotiation enabled

The following are use cases when Auto negotiation is enabled.

In IEEE802.3bp, 100M and 1000M can be selected as Auto negotiation specifications. In Auto negotiation of this product, the speed when Auto negotiation is enabled operates at 100/1000M when the S switch is ON and 100M when the S switch is OFF.