Configuration of the
CL-NET network
333
1SVC 440 795 M1100
Network transmission security
The CL-NET network is based on a CAN system. 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: 1 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.
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