In networking, the transmission capacity of a computer or a communications channel, stated in megabits or megabytes per second; the higher the number, the faster the data transmission takes place. Bandwidth in a medium can be used in two ways. When the entire bandwidth is devoted to a single data signal, the cable is operating in baseband mode. When the bandwidth of a medium is used to carry several independent signals, the medium is operating in broadband mode. Cable TV is an example of broadband signaling.
In DOS, a file that contains one or more commands that are executed together as a set. You create the batch file by using a text editor (like the DOS EDIT command) and run the file by typing its name at the command prompt. A DOS batch file must have the file-name extension .BAT, while an OS/2 batch file has the extension .CMD.
Baud rate is often mistakenly assumed to correspond to the number of bits transmitted per second, but because in modern high-speed digital communications systems one state change can be made to represent more than 1 data bit, baud rate and bits per second are not always the same. A rate of 300 baud is likely to correspond to 300 bits per second, but at higher baud rates, the number of bits per second transmitted can be higher than the baud rate as one state change can represent more than one data bit. For example, 2400 bits per second can be sent a t 1200 baud if each state change represents tow bits of information.
On the PC, the MODE command is used to set the baud rate of a serial device, perhaps a modem or a printer. Both the sending and the receiving devices must be set to the same baud rate, and in times past, mismatched baud rates were one of the most common reasons for communications failures. These days, intelligent modems can lock onto one of a range of rates, and can even change rates in response to changing line conditions during the course of a transmission