Page 27 - 2021 Connectivity Components: Everything but the Connectors eBook

• Speed.CANhighwireenablestransmissionratesofupto1megabitpersecondbetweenavehicle’selectronic devices and modules (for more information on CAN protocol standards, see ISO 11989-2).
• Cost and weight savings. Reduced wiring means less labor, lower material costs, and reduced weight. A typical vehicle uses about 1,500 different copper wires totaling nearly a mile in length. Using CAN bus, as much as 50 pounds of wire weight can be trimmed off a vehicle. Based on the current cost of copper wiring, the related material cost savings could range from $800 to $1,000 along with lifetime fuel savings from the reduced weight.
• Error handling and detection. In the CAN bus, each electronic device (or node) can communicate with other nodes on the network. Error handling is built into the CAN protocol — each node checks for errors in transmission and maintains its own error counter. The node system limits the amount of bus capacity being taken up by error messages.
• Durability.Robustnessandreliabilityarealwaystopofmindwhenaddingnewfunctionstoavehicle.TheCAN communication protocol is self-sustaining and carries signals for long periods of time with minimal maintenance. CAN bus cable is highly resistant to electrical disturbances and can function reliably in high temperature conditions and demanding environments.
The two types of CAN bus cable
CAN bus twisted wire is available in shielded or unshielded varieties. Shielded cable (designated by the “11” in J1939/11) provides shielding from static interference. For vehicles with multiple electrical systems running over CAN bus, shielded cable is advisable. For applications with few connections or short wire runs, unshielded cable (designated J1939/15) may be adequate.
» EXRAD CAN Bus shielded cable from Champlain Cable is designed with materials that meet or exceed TXL standards and the impedance, return loss, and attenuation requirements of the network system. TXL wire is made to be used in high-temperature environments while minimizing weight and wire diameter. Shielding reduces the harmful effect of EMI and RFI interference and coupled with controlled impedance can reduce or eliminate data transfer issues.
Sleeving for added protection
CAN bus cable is the lifeblood of the CAN system. If the wire inside gets nicked or damaged, the whole CAN system can be compromised or brought to a halt. When installing the cable near sharp edges or in places subject to heat, high vibrations, or other environmental factors, consider protecting it with woven wrap sleeving made for wire harnessing applications.
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