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How broadband works: Difference between revisions

How broadband works (view source)

Revision as of 21:52, 18 March 2015

110 bytes added ,  18 March 2015
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→‎Margins
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Some lines are very stable, having the same characteristics all of the time. These lines need very low margins. However some lines vary a lot, and this can be over a daily cycle depending on temperature or weather conditions which affect the performance of the line and levels of interference affecting the line. Such lines need higher margins.
 
ThereWith BT ADSL and FTTC circuits there is an automatic system to establish that a line is re-syncing a lot and adjust the margin to be higher in future. This is called Dynamic Line Management (DLM) and runs all of the time. It can take a few days for a new line to get the right margins for stable operation when first install, but in practice it is rarely more than the first few hours.
 
The margin on TalkTalk lines can be adjusted manually by staff and customers.
 
==Interleaving==
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