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User Guide
Ports which are capable of connecting to other apparatus are defined as
SELV. To ensure conformity with EN41003, ensure that these ports are
only connected to ports of the same type on other apparatus.
Compliance with BS6305 Clause 6.2, BS6320 Clause
7.2, and BABT/SITS/82/005S/D
a. The modem is suitable for connection to the Public Switched Telephone Network
(PSTN) provided by British Telecommunications plc or Kingston Communications
(Hull) plc. Circuit supply by British Communications, Mercury Communication, or
Hull City Council. Only direct exchange lines may be used, not shared service.
b. The modem is suitable for household, office, and similar general indoor use. It is
not suitable for use as an extension to a payphone.
c. BT lines supplied must support either loop disconnect or multifrequency tone
signalling.
d. REN (Ringer Equivalence Number).
The REN value of a unit is calculated from 3/n where n is the total number
of units which can be connected in parallel which will still cause the
standard bell (as defined in BS6305 Appendix D) to ring.
REN values of less than 0.3 cannot be assigned.
REN = 1
If a telephone or other device is connected in parallel with the modem,
the combined REN must not exceed 4. A BT supplied telephone may be
assumed to have REN of 1.0 unless otherwise noted.
The approval of this modem for connection to the British Telecom public
switched telephone network is INVALIDATED if the apparatus is subject
to any modification in any material way not authorized by BABT or if it is
used with or connected to:
i. internal software that has not been formally accepted BABT.
ii. external control software or external control apparatus which cause the opera-
tion of the modem associated call set-up equipment to contravene the require-
ments of the standard set out in BABT/SITS/82/005S/D.