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What is the difference between DSL and ADSL?

This is the difference between DSL and ADSL:

DSL means “Digital Subscriber Line”. There are different DSL variants, all of which are based on the technology (“Digital Subscriber Line”).

ADSL is a variant of DSL and stands for “Asymmetric Digital Subscriber Line”. ADSL technology uses the conventional telephone line, but offers different speeds in both transmission directions. Hence the term “asymmetrical”. Downstream (i.e. towards the user) transmission rates of up to 16,000 kbit/s are possible (ISDN: 64 kbit/s or 128 kbit/s with channel bundling). Upstream (from the user to the Internet), up to 1152 kbit/s can be achieved. The actual speed achieved depends on how far the house connection is from the next main distribution frame. The following applies: the greater the distance, the lower the bandwidth transmitted. Furthermore, the bandwidth depends on whether your provider has already invested in modern ADSL2+ technology and whether your connection may be limited in speed by your provider.

In addition to ADSL, there are other DSL technologies such as SDSL, HDSL and VDSL, each with their own specific advantages and disadvantages.