BT Broadband Quick Start Manual page 40

4 One socket near computer, extension lead doubler used for phone
5 One socket – extension lead to computer and extension lead to Sky
Tips
You can connect a phone and Hub to the same ADSL filter.
•
You can connect two phones to the same ADSL filter if you use a
•
socket doubler.
An ADSL filter should be at one or the other end of an extension lead only,
•
not both.
If you're using an extension lead for your Hub, the ADSL filter must be
•
fitted at the same end as the Hub.
If you've a socket, but there's nothing plugged in to it, you don't need
•
an ADSL filter.
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