BT DF450 manual Voltage drop

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Voltage drop

The voltage drop introduced by the apparatus between the PSTN and the associated telephone/answering machine is 0.4 Volts at 40mA dc.

The introduction of this voltage drop may occasionally cause difficulties in making calls from the associated telephone or problems in telephone conversations being experienced by both parties to the call.

While operation may be possible initially, changes to or modernisation of the network taking place in the normal course of events may result in the apparatus being connected to a network service with which it is not designed to be compatible. Failure of the apparatus to work under these circumstances may not be the responsibility of the network operator.

In the unlikely event of any such problems occurring, the user should contact the supplier or maintainer of the apparatus.

Difficulty may be experienced when making calls from other apparatus. Such difficulties may include:

•difficulties in making a call;

•problems in telephone conversation being experienced by both parties to the call.

Note - The definition of a RBS (Relevant Branch System) from PSTN lines is given in BS6789 section 6.1 (1986) clause 2.4

Connecting to switchboards

Your DF450 is approved only for use with a compatible switchboard including those which do not provide secondary proceed indication.

If you do have a compatible switchboard, it cannot be guaranteed that the DF450 will operate correctly under all possible conditions of connection.

If you have any difficulties, contact BT on Freefone 0800 800 152.

Technical

Safety warning

Interconnection circuits should be such that the equipment continues to comply with the requirements of 4.2 of EN 41003 for TNV circuits and 2.3 of EN 60950 for SELV circuits, after making connections between circuits.

Interconnection directly, or by way of other apparatus, of ports marked Safety Warning. See instructions for use. Ports marked or not so marked may produce hazardous conditions on the network. Advice should be obtained from a competent engineer before such a connection is made.

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Contents User guide DF450 plain paper fax machineAutomatic document Top viewTop view with the printer cover and control panel open Last TX Control panelThis guide For your records Setting upFollow these steps to get your DF450 ready Plug into the BT socket Fit your DF450 attachments to the main unit Plug the mains lead into a convenient socketTo fit the sent document tray Fully assembled DF450 with attachments fitted Place paper in the automatic sheet feeder Install the print cartridgeClose cover Setting the time and date Connecting a phone or an answering machine to your DF450Setting your name and fax number International codes Name and fax number positionUsing your DF450 Normal dialling Fax is received and printed Which mode is correct for you? Setting the answer modeEither Using a phone or answering machine with your DF450Remote control from an extension Insert the document PollingStoring one-touch and Quickdial numbers and names Press the Function button the display shows FAX SET-UP To store Quickdial numbers and names Press the Function button, display shows FAX SET-UP Fax monitor To change the speaker volumeTo automatically print individual reports Print-outsTo print a list of stored names, numbers and settings Adjusting for different-size paper Changing the size of incoming faxes Adjusting the silence lapse time Adjusting the beep in phone/fax modeConnecting your DF450 to a direct exchange line Connecting your DF450 to a private switchboardInserting a pause Error correction mode ECM Setting the external buttonSpeed DiagnosticsMaintenance Blank sheet of paper. If the copy is not clear DF450 doesn’t print properly If printing paper is jammed Freefone 0800 Industry standard test sheet Display messages Automatic test procedure No action Operation Transmission report messages Journal report messages Message in Result Interpretation Action Field Engaged tone detected before Repeat transmission Electrical characteristics Technical Specifications and General CharacteristicsTechnical information Voltage drop Index REN Index Page Offices in Europe, North America, Japan and Asia Pacific
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