Asymmetric Digital Subscriber Line(ADSL)
The most common meaning for ADSL is "Asymmetric Digital Subscriber Line." It is referring to a form of Digital Subscriber Line, which is a data communications technology.
Asymmetric Digital Subscriber Line (ADSL) is a form of DSL, a data communications technology that enables faster data transmission than a conventional modem can provide. A modem which can do such a job is called an ADSL modem.
Asymmetric DSL (ADSL)
Copper Telephone Line
ADSL is simply a version or 'flavour' of DSL. The 'a' refers to asymmetric, meaning 'not the same'. Hence, ADSL usually has different downstream and upstream rates (e.g. 1536/256 is a common speed of ADSL available in Australia, where downstream the link speed is 1536kbps and upstream is 256kbps).
Asymmetric dsl (ADSL) Rate-adaptive DSL (RADSL)
A lot of the high speed broadband services feature a faster download speed, that an upload speed. This is fairly common and is called asymmetric. xDSL, aka digital subscriber line, has ADSL which is asymmetric, and SDSL with is symmetric. The download and upload speeds are the same for SDSL, and the download speed is faster with ADSL, but the upload speeds are slower. My cable connection for data, for instance, is 20mbps down, and only 1.5mbps up. This is an asymmetric plan.
adslIt's ADSL (Asymmetric Digital Subscriber Line).Typically, ADSL (Asynchronous DSL).There may also be SDSL (Synchronous DSL), but this is not used in most of the US anymore.There is also GDSL and FoDSL. These are very rare.
A lot of the high speed broadband services feature a faster download speed, that an upload speed. This is fairly common and is called asymmetric. xDSL, aka digital subscriber line, has ADSL which is asymmetric, and SDSL with is symmetric. The download and upload speeds are the same for SDSL, and the download speed is faster with ADSL, but the upload speeds are slower.My cable connection for data, for instance, is 20mbps down, and only 1.5mbps up. This is an asymmetric plan.Read more: What_system_uses_one_upload_speed_and_a_faster_download_speed
Traditional ADSL will only work over copper. There are newer services, like FiOS from Verizon that is technically ADSL but it runs over Fiber. I am a Provisoiner of Broadband Services (ADSL, Cable, T-1, Frame, EVDO, etc...) I run into Fiber issues all the time. Even if it is copper to your nieghborhood and then fiber, or vice versa, traditional ADSL will not work.
These are all computer and technology terminology. Analog and digital signals are used for data transmission, and ADSL refers to an Asymmetric Digital Subscriber Line modem.