As with all DSL connections, the further the distance from the DSLAM
(usually located at the telephone exchange) the customer site is, the
slower the line speed will be. Sky use DLM (Dynamic Line Management)
over the first 10 days of a new connection to set the line at an
acceptable downstream and upstream speed in order for the connection to
remain stable.
Lines are initially connected at 4Mbit/s and gradually increased over
the 10 day "training period" until the line shows signs of instability,
this allows Sky to know what speeds the line can handle whilst
remaining stable.
Sky launched fibre based broadband products in April 2012, almost 2
and half years after British Telecom launched BT Infinity in January
2010. [1]
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