User Manual

easy-NET network
262
08/04 AWB2528-1423GB
Network transmission security
easy-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 x 10
10
messages per year of which
1.12 x 10
7
messages are faulty
• residual error probability: r < 10
–10
x 10
–3
= 10
–13
This means: one of 10
13
messages is so corrupt that the fault
cannot be recognised as such. For a network, this
corresponds to a working time of approx. 1000 years.