Which xDSL flavour delivers both downstream and upstream speeds of 1.544 Mbps over two copper
twisted pairs?
A.
HDSL
B.
SDSL
C.
ADSL
D.
VDSL
Explanation:
HDSL – High-Data-Rate Digital Subscriber Line – 1.544 Mbps each way over 2 copper twisted pair
(http://www.cisco.com/en/US/tech/tk175/tk318/tsd_technology_support_protocol_home.html)