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Government Approvals 7-7
U.K. BABT Users Notice
(SupraExpress 56i Pro Global Modem - Desktop Products Only)
The modem is intended for only use in the Compaq Internet PC. For the purposes of
BABT approval, the modem is classified as a host-independent product.
Telephone
Network
Connection
The modem is suitable for connection to the Public Switched Telephone Network
(PSTN) direct exchange lines and relevant branch systems (PBXs).
A ringer equivalent number (REN) is a value given to all apparatus to be connected to
the PSTN. Its value can be taken and used to calculate the maximum number of
equipment items that can be connected in parallel without impairing the performance
of the standard bell circuit.
1. REN = 3/n where n is the maximum number of units that may be used in parallel.
2. The maximum REN of a line is 4; therefore, the total REN of all apparatus
connected to the line (obtained by summing the individual REN values) should
not exceed 4. This value includes any BT provided instrument, each of which is
assumed to have REN value of 1.0 unless otherwise stated. Exceeding the REN
value of 4 may cause your telephone(s) to ring weakly or not ring at all.
3. Only one modem should be connected to a telephone line. Connecting a modem
in parallel with one or more telephone instruments is not allowed.
4. The REN for this piece of equipment is 0.8.
5. The exchange should provide facilities for either loop disconnect (pulse) dialing
or multifrequency (tone) dialing. The modem can be configured to operate with
either system.
6. During dialing, this apparatus may tinkle the bells of other telephones using the
same line. This is not a fault, and we advise you not to call the Fault Repair
Service.
7. The modem specified in this guide is for the Compaq Internet PC.
8. This apparatus has been approved for the following facilities:
❖ Connection to direct exchange lines providing DTMF signaling
❖ Connection to compatible PBXs providing DTMF signaling
❖ Operation in the absence of proceed indication, selectable by user
❖ Call progress monitoring functions
❖ Data modem functions
❖ Auto-dialing functions
❖ Auto-answering functions