Alcatel Speed Touch Wireless, User Manual

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Mutual POTS/ADSL, or
ISDN/ADSL interference
Consequences of
interference
Solutions to avoid this
interference
Inside the STWireless
Home installation
In the following
sections
AppendixB ADSL Connectivity
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3EC 17766 AAAA TCZZA Ed. 01
B.3 Splitters and Filters
Next to existing POTS, or ISDN signals, ADSL signals are added to
the wires in central telephony offices.
Although POTS, or ISDN and ADSL occupy distinct channels, they
might influence one another.
In devices such as phones, modems, answering machines and fax
machines (collectively referred to as telephony devices) ADSL
signals can cause audible noise.
Telephony devices can in turn interfere with ADSL signals, causing
deterioration in data throughput.
To avoid this mutual interference, an electronic central splitter, or
distributed filters need to be installed.
Inside the STWireless , dedicated filters remove the POTS, or ISDN
signals. Consequently, only the ADSL signals remain to be
processed by the STWireless ADSL router.
As a variety of configurations are deployed, ask your ADSL
provider for advice. He will usually prefer one solution rather than
another.
Topic See
Central Splitter B.4
Distributed Filters B.5