What’s the difference between ADSL and SDSL?

Published 12/05/2005 10:56   |    Updated 13/02/2009 12:56
What’s the difference between ADSL and SDSL?
ADSL (Asymmetric Digital Subscriber Line) currently provides download speeds of up to 512Kbps, 1Mbps and 2Mbps with a maximum upload speed of only 256Kbps regardless of download speed.

SDSL (Symmetric Digital Subscriber Line) provides the same speed in both directions, so if you buy an BT Business Broadband SDSL service you will have up to 2Mbps in both directions. That's an upload speed up to eight times faster than ADSL.

SDSL circuits are carried over a new copper wire and they do not support traditional telephony unlike ADSL where a customer is able to access the Internet and make a phone call using the same line at the same time.
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