You know what it looks like… but what is it called?
TAKE THE QUIZ“subscriber line”
The following 2 entries include the term subscriber line.
asymmetric digital subscriber line
noun: a digital subscriber line in which information is transferred faster in one direction than the other —abbreviation ADSL
digital subscriber line
noun: a high-speed communications connection used for accessing the Internet and carrying short-range transmissions over ordinary telephone lines —abbreviation DSL
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Merriam-Webster unabridged