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User guideDoortello HomeIssue 1.00

Page 7

Driver contacts 1 and 2 (D1/D1'; D2/D2')

Telephone line (T/T')

The unit must be connected to an analogue telephone line to work. The telephone

line can be a public line, an extension line or the input of a specific FXS adapter

for special networks like GSM, DECT or VoIP. Please take care that the open line

voltage should not be below 20 Vdc and it should be able to delivery a minimum

of 18 mA during the seizure. For the best speaker phone functionality select also

the correct line impedance (read also the chapter Line impedance).

Please note!

The Doortello Home door phone has a „fine“ over voltage protection. This is

useful only if more over voltage protection circuits are installed. If the unit is

installed outside a building we suggest the installation of a over voltage

protector with ground connection on the specific telephone line.

The driver contacts can be used to open doors or other functions like the

activation of a video camera. As default the first driver contact is activated

pressing the DTMF digit „7“ during the conversation, and the second driver

contact with the digit „8“. Other ways to work are possible, like the automatic

activation with line seizure. Also the activation codes can be programmed, i.e.

to make the door opening dependent from the input of a code from the

telephone. Read also the chapter Programming for more information.

Please note!

The two driver contacts integrated in the Doortello Home door phone are

dry but not galvanic contacts as they are electronic circuits. That means that

driver voltage below 6 V may not work. In this case you need to use external

relays, like the universal relay 1471 (see also Options for more information).

Line impedance

For a better sound quality of the speaker phone you need a perfect line

impedance adaptation. The line impedance jumpers is therefore available to

select the impedance of the telephone line you are using. You can choice between

600 Ohm (default) and Zr line impedance. You can normally read which type of

line impedance you have in the technical documentation of the telephone switch

or adapter you are using. Normaly small switches and adapter have 600 Ohm,

larger switches and public telephone line (in Europe) have Zr. If you are not sure

which line impedance you have just use the selection which gives you the best

results.

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Rocom Doortello Home Guía de usuario Pagina 7