CAN Bit Rate 1Mb/s? Or is this Baud Rate?

[digi001]

CAN advertises 1Mb/s. Is this baud rate (total transmitted bits) or this actual bit rate (total transmitted data bits) ?

 

[kalyanasv]

The specified bit rate of CAN bus is 1Mbit/s, which is the number of actual bits that can be transmitted over the bus.

 

[uoficowboy]

The specified bit rate of CAN bus is 1Mbit/s, which is the number of actual bits that can be transmitted over the bus.

To be clear: 1Mbps is the *maximum* specified bit rate for CAN. 125Kbps is a fairly standard CAN bit rate. I've also worked on CAN buses running at 2.4Mbps (clearly way out of spec, but also fully functional).

The CAN frame structure is not very efficient, so even at 1Mbps you will get nowhere near 1Mbps data through the bus. I believe I found (it has been a while since I ran the numbers) that you could get about 50% of that, due to the large CAN frame structure.