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The purpose of this article is to investigate data technology and compare analog data transmission in communications and digital data transmission over distance.<br>This document (article) uses a description method.<br>Analog signals can be multiplexed by combining them with carrier frequency. When there is more than one channel, it is called frequency-splitting (FDM). FDM has been widely used in the past, but has now been replaced by a digital equivalent - with a temporary separation (TDM). TdM transmission is used at levels 1 (T1). In the T1 system, the analog speech channel is discrete and each sample is encoded. Twenty-four channels are mixed and transmitted by the bitrate. T1 remains an important way to transfer speech and data to the PSTN standard.<br>This digital transmission programme is closely linked to the digital exchange programme. A channel in PSTN can be an analog, digital or a combination of them.<br>The article describes the method of transmitting voice messages and the method of communication through analog or digital signal, as well as its development.<br>The author concluded that, over time, the transmission of a digital signal in communication would play a greater role in communication, and it could be managed through the user. ...
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