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BT Duet 20 – Issue 2 Edition 01 – 12.02.04 – 5957
10 Technical information
How many telephones can you have?
All items of telephone equipment have a Ringer
Equivalence Number (REN), which is used to
calculate the number of items which may be
connected to any other telephone line. Your BT
Duet 20 has a REN of 1. A total REN of 4 is
allowed. If the total REN of 4 is exceeded, the
telephone may not ring. With different telephone
types there is no guarantee of ringing, even when
the REN is less than 4.
R&TTE
This product is intended for use within the UK for
connection to the public telephone network and
compatible switchboards.
This equipment complies with the essential
requirements for the Radio Equipment and
Telecommunications Terminal Equipment Directive
1999/5/EC.
Declaration of Conformance
Hereby, PDT, declares that this BT Duet 20 is in
compliance with the essential requirements and
other relevant provisions of Directive 1999/5/EC.
The Declaration of Conformance for the BT Duet 20
is published on the website:
http://www.pdtuk.com/archive/certificates/duet/
d20cert0001.html
Switchboard compatibility
This product is intended for use within the UK for
connection to public telephone network and
compatible switchboards, which support tone
dialling and timed break recall. If in doubt please
consult your network service provider.