Cable Specifications

Cables should meet the physical medium requirements specified in ISO 11898. Belden cable (3084A) meets all these requirements and should be suitable for most applications. The following tables show the ISO 11898 specifications for characteristics of a CAN_H and CAN_L pair of wires

Table 2. High-Speed/Flexible Data-Rate CAN
Characteristic Value
Impedance 95 Ω minimum, 120 Ω nominal, 140 Ω maximum
Length-related resistance 70 mΩ/m nominal
Specific line delay 5 ns/m nominal
Table 3. Low-Speed/Fault-Tolerant CAN
Characteristic Value
Length-related resistance 90 mΩ/m nominal
Length-related capacitance: CAN_L and ground, CAN_H and ground, CAN_L and CAN_H 30 pF/m nominal