User manual

48
While operation may be possible initially, change to or modernization of the network taking place
in the normal course of events may result in the apparatus being connected to be compatible. Failure
of the apparatus to work under these circumstances may not be responsibility of the network operator.
In the unlikely event of such problems occuring, the user should contact the supplier or maintainer
of the apparatus.
Note : The definition of RBS (Relevant branch system) for PSTN lines is given
in BS6789 section 6.1 (1986) clause 2.4
9. Naive caller
« Callers are accustomed to being answered normally within 10s and that the majority abandon calls
that are not answeed within 45s »
It is « normal » to set the number of rings beetween 1 to 5 rings before the answering machine responds
The machine is already preset for a plug and play mode.
« If the intention is to delay answer so that normal voice callers would abandon the call before the
non-voice TE answered, then the delay should at least 45s ».
It is helpful to include the statement of the answering telephone number with the exchange name or
international code and that the announcement must be sutable for the purpose for which it is intented.
The announcement should also start within 3s of answering.
Paytone may be received after answering calls from some types of payphones and may persist forr
up to 13s and the answering announcement should be constructed so as to ensure that an answering
announcement containing the identity of the called line and, where appropriate, the invitation to
record, will be heard by the callers after paytone has ceased.
Important ! Compatible switchboards
Your terminal is approved only for use with the compatible switchboard including those which do not
provide secondary proceed indication. If you would like a list suitable switchboards, contact BT on
0800 800 152.
If you do have a compatible switchboard it cannot be guaranteed that the apparatus will operate
correctly under all possible conditions of connection.If you have any difficulties, contact BT on 0800
800 152.
Calling the Emergency services
WARNING This equipment is not designed for making emergency telephone call (999)
when the power fails. Alternative arrangements should be made for access to
emergency services
10. SAFETY WARNING
Interconnection circuits should be such that the equipment contibues 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 the other apparatus, of ports marked « SAFETY
WARNING ». SEE INSTRUCTION FOR USE, with 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.
Liasse2_23227944-0.p65 07/06/2000, 11:4848