Digital Watchdog D2365T Instalační manuál stáhnout pdf (Strana 27)

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

ADSL filter and security equipment in a

tamper protected enclosure

Duet

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Digital Watchdog D2365T Instalační manuál Strana 27