25
United Kingdom
Ringer Equivalence Number
The Ringer Equivalence Number (REN) is a customer guide indicating approximately
the maximum number of items of apparatus that should be connected simultaneously to
the telephone line. The sum of the RENs should not exceed four. This value includes
any BT-provided instrument which may be assumed to have a REN of 1 unless marked
otherwise. The REN of this modem is 1.
Connection to Leased Lines
If any other apparatus, including cable or wiring, is connected between the apparatus
and the point of connection to any speechband circuit, then all that other apparatus
shall comply with the following:
1. The overall transmission characteristics of all that other apparatus shall be such as
to introduce no material effect upon the electrical conditions presented to one
another by the apparatus and the speechband circuit; and
2. All that other apparatus shall comprise only:
(i) apparatus approved for the purpose of connection between the apparatus and a
speechband circuit; and
(ii) cable or wiring complying with a code of practice for the installation of
equipment covered by this part of BS 6328 or such other requirements as may be
applicable.
This modem is suitable for connection to BT circuits with signalling at a nominal
frequency of 2280 Hz and may be connected to multipoint or point to point circuits. The
apparatus does not require signalling or otherwise use the frequency range 0 –200 Hz.
No dc interaction is intended between the modem and the telephone network.
This apparatus may be directly connected to a speechband circuit or connected to a
relevant branch system for speechband circuits.
All European Countries
Safety Notice
Interconnection circuits between this modem and any other equipment should be such
that the equipment continues to comply with the requirements of EN41003 for TNV
(Telephone Network Voltage) circuits and EN60950 for SELV (Safety Extra Low
Voltage) circuits after making connection between circuits.
