To express network transmission speed generally is in unit of Bps , its meaning is binary bits transmitted per second. Different network generally has different baud rate, the same networks with different network cable can achieve different baud rate. Such as: The communication speed of PROFIBUS field bus with twisted pair as network cable  is 1.5 KBps and that with fiber optic cable as network cable is 12 MBPS. The  transmission speed of erthernet with common twisted-pair is 10 MBPS, and that with optical cable can reach to 100 MBPS. In addition, the length of the transmission distance affects the transmission speed, in general, the longer the distance is, the slower speed is.