Today, common uses of wireless data transmission include pagers, cellular telephones, microwave transmissions, communication satellites etc. The wireless transmission medium is the electromagnetic spectrum. The characteristics of the communications channel help determine the efficiency and capabilities of a telecommunications system. The total amount of information that can be transmitted through any telecommunications channel is referred to as the baud rate. GBPS High 2.
Asynchronous transmission is used for low speed transmission.
Synchronous transmission transmits groups of characters simultaneously, with the begining and ending of a block of characters determined by the timing circuitry of the sending and receiving devices. Synchronous transmission is used for transmitting large volumes of data at high speed. The front-end processor is a small computer dedicated to communications management and is attached to the main, or host, computer in a computer system. The front-end processor performs special processing related to communications such as error control, formatting, editing, routing, controlling, and speed and signal conversion. It is largely responsible for collecting and processing input and output data to and from terminals and grouping characters into complete messages for submission to the CPU of the host computer.