1.6 SPEED OF DATA TRANSMISSION

 Speed of data transmission plays a major role in data communication. How fast data can be transmitted from place to place is sometimes called bandwidth. Bandwidth is a data transmission rate that tells the maximum amount of information (bits/second) that can be transmitted along a channel. It is measured in kilobits, kbps, 1,000 of bits per second, or megabits (Mbps), millions of bits per second. Actual transfers are considerably lower because of software and protocol overhead.

Dialup modems are generally capable of a maximum bit rate of 56 kbit/s (kilobits per second) and require the full use of a telephone line—whereas broadband technologies support at least double this bandwidth.

Broadband is often called "highspeed" Internet, because it usually has a high rate of data transmission. In general, any connection to the customer of 256 kbit/s (0.256 Mbit/s) or greater is more concisely  considered broadband Internet.

The standard broadband technologies in most residential areas are DSL (Digital subscriber Line) and cable modems. Telephone companies developed DSL technology after traditional modem reached their full speed. DSL comprises several new technologies (ADSL, VDSL, HDSL and SDSL), each differs in the first letter.

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