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ADSL (Asynchronous Digital Subscriber Line) or ‘Broadband’
When an analogue PSTN telephone line also carries ADSL (Broadband)
signals and it is used by a security system e.g. DualCom, then an ADSL
(Broadband) filter MUST be used.
A filter is used to separate the analogue telephone signals from the ADSL
(Broadband) digital data signals because the phone or security system may
be disrupted or completely inhibited if ADSL (Broadband) digital data is
allowed into them from the telephone line.
The CSL CS0730 Security ADSL Filter is designed specifically for use with
security systems. It includes spare terminals to aid wiring that are labelled
‘Pass Through’. This item meets all of the requirements of the British and Euro-
pean telephone and security standards. See Fig 25.
CS0730
Security ADSL Filter
Fig 25
Other types of filter and plug-in filters should not be
used for Series Connection of a security system to
the telephone line.
Serial Connection to a PSTN (and Broadband)
telephone line is shown in Fig 26.
The installer must ensure that:
1. The user’s telephone wiring is disconnected from
the NTP and reconnected to the CS0730 ADSL Filter .
2. The NTP connects only to the CS0730 ADSL Fil-
ter and to no other wiring or telephone sockets.
3. The wiring between the NTP and the the CS0730 ADSL Filter can not be
unplugged by the user.
4. The user can not plug a phone/fax etc. into the NTP.
5. The terminals 2,3 & 5, A & B and A1 & B1 are connected exactly as shown
in Fig 26.
Simple ADSL (Broadband) Filter
Where the only items connected to the DualCom’s
A1 and B1 terminals are analogue equipments (i.e.
phones but not computers) then the CS0720 Filter
may be used between the telephone line and the
DualCom’s A and B terminals.
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