DATA TRANSMISSION
Data Transmission Method
One of the primary concerns when we are considering the transmission of data from one device to another is the writing and primary concern when we are considering the wiring is the data stream. Do we send 1 bit at a time; or do we group bits into larger groups and if so how the transmission of binary data across a link can be accomplished in either parallel or serial mode. In parallel mode, multiple bits are sent with each clock tick. In serial mode, multiple bits are sent with each clock tick. While there is only one way to send parallel data, there are three sub classes of serial transmission: asynchronous synchronous and iso-sychronous.
Parallel Transmission:
Binary data consisting of 1s and 0s may be organized into groups of n bits each. Computers produce and consume data in groups of bits much as we conceive of and use spoken language in the form of words rather than by letters. By grouping we can send n bits at a time instead of 1. This is called parallel transmission. The mechanism of parallel transmission is a conceptually simple one; use n wires to send n bits at one time. That way each bit has its own wire, and all bits of one group can be transmitted with each clock tick from one device to another. Typically 8 wires are bundled in a cable with a connector at each end.
The advantage of parallel transmission is speed. All else being equal parallel transmission can increase the transfer speed by factor of n over serial transmission. But there is significant disadvantage: cost. Parallel transmission requires n communication lines just to transmit the data stream because this is expensive parallel transmission is usually limited to short distance.
Serial Transmission:
In serial transmission one bit follows another, so we need only one communication channel rather than n to transmit data between two communicating devices. Since communication within devices is parallel, conversion devices are required at the interface between the sender and the line and between the line and the receiver. Serial transmission occurs in one of three ways: synchronous asynchronous and iso-synchronous.
Keywords : data transmission network, data transmission, cellular data transmission, fiber optic data transmission, types of data communication, synchronous.
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