(< symmetric digital subscriber line,
"sümmeetriline digitaalne abonendiliin")

olemus
andmeside omandtehnoloogia, kasutab tavalist telefoniliini edastuseks võrdse üles- ja allalaadimiskiirusega; erimodemi abil kuni 2,3 Mbit/s ja kuni 3,5 km
= a data communication technology based on DSL, which enables data transfer on a single line and allows symmetric bandwidth on the upstream and downstream

ülevaateid
https://www.techopedia.com/definition/5390/symmetric-digital-subscriber-line-sdsl

https://en.wikipedia.org/wiki/Symmetric_digital_subscriber_line

https://www.quora.com/What-are-the-differences-between-ADSL-and-SDSL

http://www.ieee802.org/3/10SPE/public/Nov2016/traeber_10SPE_01a_1116.pdf

https://medium.com/@callcentersolutions46/understanding-internet-leased-lines-benefits-features-and-considerations-219b54979ef3