Uplink bandwidth, that is, uplink speed, generally refers to the speed of uploading from your computer and the speed at which others communicate from your computer.
ADSL (Asymmetric Digital Subscriber Loop) technology is a technology that uses asymmetric digital subscriber lines to realize broadband access to the Internet.
As a transport layer technology, ADSL makes full use of existing copper cable resources, providing a bandwidth of 640kbps (theoretically, 1Mbps) and a downlink bandwidth of 8Mbps on a twisted pair, thus overcoming the "bottleneck" of traditional users in the "last mile" and realizing real broadband access.
Extended data:
Relationship between uplink rate and downlink rate.
Uplink rate refers to the data transmission rate when the user computer sends information to the network. For example, uploading files to the Internet by FTP will affect the uploading speed.
Downlink rate refers to the transmission rate when the network sends information to the user's computer. When downloading files from the Internet, the downlink rate will affect the download speed.
Of course, in the actual upload and download process, the quality of lines and equipment (including computers and other equipment) will also affect the speed more or less.
The ADSL we use is asymmetric transmission mode, that is, the uplink rate is not equal to the downlink rate; The uplink rate of ADSL is 640Kbps to 1Mbps, and the downlink rate is 10Mbps to 100Mbps.
Generally, it is 20Mbps. Note that the downlink rate is not equal to the download rate. Usually when we download software or movies, we can only reach 1MBps instead of 20Mbps. In fact, 20 Mbps broadband is 20 Mbps instead of 20 megabytes.
According to the formula of 8 bits = 1 byte, let's calculate: 20 bits = 20480 kbit = 2560 kbyte, so theoretically, the maximum speed of broadband download of 20 meters should be 2 meters, but because of other factors, the actual download speed is normal at around 2 meters.
Baidu Encyclopedia-Uplink Broadband