SDSL stands for Symmetric Digital Subscriber Line. It is called "symmetric"
because it moves data quickly and at the same rate from the exchange to the
customer (download speed) as it does from the customer to the exchange
(upload speed).
Whereas, the majority of Broadband circuits in the UK are ADSL, standing for
Asymmetric Digital Subscriber Line.
It is called "asymmetric" because it moves data more quickly from the
exchange to the customer (download speed)
than it does from the customer to the exchange (upload speed).
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