BASIC TYPE OF DATA TRANSMISSION: Parallel transmission Serial transmission 1. PARALELL TRANSMISSION:         Within a computing or communication on device the distance between different sub units are too short. Thus it is normal practice to transfer data between sub units using a separate wire to carry each bit of data. There are multiple wires connecting each sub units and data is exchange using a parallel transfer mode / transmission mode. A=01000001

In parallel transmission all the bits of data are transmitted simultaneously or separate communication wire. Or a bits of one group are transmitted with each clock plus from one device to either multiple bits are send with each clock plus.   ADDVANTAGES OF PARALELL TRANMISSION: These are speedily. Bits are transfer from one device to another device in a short time. Because there are multiple wires connecting each sub units and data is exchange using a parallel transmission. DISADVANTAGES OF PARALLEL TRANSMISSION: These are very costly because there are multiple wires connecting each sub units and data is exchange using a parallel transfer mode. 2 SERIAL TRANSMISSION:

2 SERIAL TRANSMISSION: When transfer data between two physical separate devices especially if the separation is more than a few km for reason of cost it is more economical to use a signal pair of nice. Data is transmitted as a signal bit at a time using a fix time interval for each bit this mode of transmission is known as serial transmission. TYPE OF SERIAL TRANSMISSION: There are two type of serial transmission. Synchronous Asynchronous There are both this transmission use bit synchronization. 1. SYNCHRONOUS: Bit synchronization is a function that is required to determine. When the begin and end of the data transmission accurse bit synchronization help the receiving computer to know when data begin and end during a transmission. Therefore bit synchronization provides timing controls.

2 ASYNCHRONOUS: Asynchronous transmission send only 1 character at a time where a character is either a letter of the alphabets or number or controls character it sends one bit of data at a time bit synchronization between two devices is made possible using start bit and stop bit. START BIT: Candidates the begging of data alert the receiver to the arrival of new group of bits a start bit usually 0 is added to the begging of each bit. STOP BIT: candidates the end of data to let the receiver new data is 1 bit is finished one or more additional bits are appended to the end of the bit. These bits usually are called stop bits. 1 0100001 Stop bit Data Start bit ADDVANTAGES OF SERAIL TRANMISSION: These are very slow speed. DISADVANTAGES OF PARALLEL TRANSMISSION: These are very cheap less.