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CommPlete 4000 Communications Server User Guide 39
Appendices
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 operation of the modem
associated call set-up equipment to contravene the requirements of the standard set out in
BABT/SITS/82/005S/D.
All other apparatus connected to this modem and thereby connected directly or indirectly to the
British Telecom public switched telephone network must be approved apparatus as defined in
Section 22 of the British Telecommunications Act 1984.
Compliance with BS6789: Section 3.1 and Part 2
a. The modem is not capable of allowing Auto Call using '999' or other PABX emergency numbers.
b. Modes other than modes 1, 2, or 3 should not be used on the BT PSTN. This modem
is a mode 1 device.
c. Users are advised to check the numbers entered during the Auto Call set up phase
prior to dialing.
d. The user should not issue any sequence of commands to the modem which would
cause the modem to exceed the maximum allowable pause of 8 seconds from the
time the modem goes off hook until dialing begins.
e. For correct operation of the call progress monitor, the power has to be properly connected and
switched on.
Compliance with BS6328 Part 1
a. The modem is not suitable for use on circuits with British Telecommunications signaling at a
normal frequency of 2280 Hz.
b. The modem does not require signaling or otherwise employ the frequency range dc to 200 Hz.
c. The modem does not require dc from the Private Circuit for correct operation. The modem may
be damaged if connected, in a private circuit mode, to a circuit supplying dc current (the
maximum permissible direct current is zero amps).