Network cabling
Section 2-3
28
Termination
ISO 11898
The bus must be terminated on both ends of the line. The cables,
connectors, and termination resistors used in CAN networks must meet the
requirements defined in ISO 11898.
The following tables list the electrical characteristics of a CAN cable and of
the terminator according ISO 11898.
Value
Cable Parameters
Minimum
Nominal
Maximum
Impedance [
Ω
]
108
120
132
Length-related resistance [m
Ω
/m]
70
Specific line delay [ns/m]
5
Value
Terminator Parameter
Minimum
Nominal
Maximum
Resistance [
Ω
]
118
120
130
Cable length
The maximum length of the cable depends on the transmission speed, see
table below.
Baud rate (kbit/s)
Network length (m)
10
5000 *
20
2500 *
50
1000 *
125
500
250
250
500
100
800
50
1000
25
* For bus lengths greater than about 1 km, a
bridge or repeater device is recommended.
The market offers cables with not only the two data signal lines, but also the
three other signal lines (CAN_GND, CAN_SHLD, CAN_V+). This enables to
connect the network power supply and shield at a central location of the CAN
network.
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