Configuration of the EZ-NET network
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347
Network transmission security
EZ-NET is a CAN-based network. CAN is used in cars and
commercial vehicles in all areas. The same fault recognition
capability with data transfer applies as with CAN. A BOSCH
study relating to undiscovered and corrupt messages
determined the following:
The probability of non-discovery of a corrupted message
(residual error probability) is: < 10
–10
message error rate.
The message error rate depends on:
• Bus loading,
• Telegram length,
• Malfunction frequency,
• Number of stations.
Example:
Network with:
• 500 Kbaud,
• average bus load 25 %,
• average operating time 2000 h/year,
• average error rate of 10
–3
,
i.e.: 1 message is faulty every 1000,
• transmission of 1.12
×
10
10
messages per year of which
1.12
×
10
7
messages are faulty,
• residual error probability: r < 10
–10
×
10
–3
= 10
–13
.
This means: one of 10
13
messages is so corrupt that the fault
cannot be recognized as such. For a network, this
corresponds to a working time of approx. 1000 years.
