Cables must meet the physical medium requirements specified in ISO 11898, shown in the following table. Belden cable (3084A) meets all these requirements and is suitable for most applications.

Table 18. ISO 11898 Specifications for Characteristics of a CAN_H and CAN_L Pair of Wires
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