Narrowband and Broadband

Bandwidth refers to the difference between the highest and lowest frequencies of a signal, which is the width of the electromagnetic wave frequency band. In the network, the larger the bandwidth, the higher the data transmission rate; The narrower the bandwidth, the lower the data transmission rate.

The unit is designed for unsupervised public use: controls are recessed or shielded, moving parts are enclosed, and the interface is operable by a child of about six with no instruction. Where a screen is used, the language can be switched without changing the hardware, and the content can be replaced on site.

The so-called "bandwidth" is the abbreviation for "bandwidth", originally a term in communication and electronic technology, referring to the range of signals that communication lines or devices can transmit. The bandwidth in the network refers to the amount of information flowing from one end to the other within a specified time, that is, the "data transmission rate". People usually divide signals into narrowband signals and broadband signals according to their bandwidth. "Narrow" and "wide" are relative concepts, and the standards for broadband are constantly changing. At the beginning, 512k was broadband, and later 2M was broadband. Starting from World Telecommunication Day in 2010, bandwidth greater than 4M or above was called broadband, and bandwidth less than 4M was called narrowband.