The data transfer rate is measured by bits per second (bps) in serial communication. There are standards rates that are usually employed for serial data transfer including:
110, 300, 600, 1200, 2400, 4800, 9600, 14400, 19200, 38400, 56000, 57600, 115200, 128000 and 256000 bps.
These speeds do not take into account the start, stop, and parity service bits but are only concerned with the effective rate of transmission. The advanced technology employed by manufacturers of motherboard chipsets has raised the possible data transfer speeds to over 1 Mbps. Data transfer speeds are impacted by the cable length used to establish connectivity and its relation to power supply lines.