Installation manual

Duet2 D2600 / Duet3 D2650 Installation Manual – EU-D2600-D2650-INST/A10/v1 - 27
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APPENDIX 3
ADSL (Asynchronous Digital Subscriber Line) or ‘Broadband’
PSTN Connection using the D0730 Security ADSL Filter
Fig 8
Q. Why is a Broadband Filter necessary?
A. When ADSL (broadband) digital data is supplied on a normal PSTN telephone line then... an ADSL
(broadband) filter must be fitted between that telephone line and each item of ‘non digital’ equipment
because the operation of ‘non digital’ equipment may be disrupted or completely inhibited if ADSL
(broadband) digital data is allowed into it from the telephone line.
‘Non digital’ equipment means anything that would be used on a normal analogue PSTN telephone
line, i.e. a phone, fax machine, Duet, digital communicator, control panel digi-modem.
Analogue and ADSL
service provided by the
Network Service Provide
r
ADSL filter and security equipment in a
tamper protected enclosure
Duet