52 Hayes Modem Installation Guide
This modem is intended to be used with the power supply module provided with this unit. Use of
any other power supply module will invalidate any approval given to this modem if as a result it
ceases to comply with EN60950. Please contact the manufacturer for details of approved power
supply modules.
DTE port
The circuits on the port on the rear of the modem marked DTE are SELV circuits. Compliance with
EN60950 is only maintained if it is connected to ports on other equipment which only contain SELV
circuits as defined in EN60950 clause 2.3.
Internal Modem Cards
This modem requires power supply voltages of -5V DC, +5V DC and +12V DC. The modem is
intended for use with a computer expansion connector supplying -5V @ 20mA, +5V @ 300mA and
+12V @ 35mA.
WARNING: The user must make sure that their host equipment is capable of supplying the
additional power required by this card and any other cards that may be connected at the same
time. It is the users’ responsibility to further ensure that the power supply in their host equipment
meets the requirements for SELV equipment.
WARNING: The modem card must be installed in the host in such a manner that with the
exception of the connections to the host, the clearances and creepages specified in the table
below are maintained between the modem card and any other assembly or option cards. The
distances in brackets apply where the local environment within the host is subject to either
conductive pollution or dry non-conductive pollution that may become conductive when wet due to
condensation.
Clearance (mm) Creepage (mm) Voltage used or generated by
host or other cards.
2.0 2.4 (3.4) Up to 50 Vrms or DC
2.6 3.0 (4.8) Up to 125 Vrms or DC
4.0 6.4 (10.0) Up to 300 Vrms or DC
Advice from a competent telecommunications engineer MUST
be obtained before installing the modem card near to (or
installing) an option card that uses or generates voltages in this
range.
Above 300 Vrms or DC
Failure to maintain these distances will invalidate the approval. If in doubt, seek advice from a
competent telecommunications engineer before installing the modem or other option cards.
ALWAYS switch off the power to the host and disconnect it from the mains supply before
attempting to install or remove a modem card.
WARNING: This modem card must only be used in a host that has a screw down lid or cover.
This modem has an analogue telecommunications interface that is intended to be connected to
telecommunication network voltage (TNV) circuits which may carry dangerous voltages. All
telephone cords must remain disconnected from the modem until it has been installed within a
host which provides the necessary protection of the user.
ALWAYS disconnect telephone cords from the modem prior to any subsequent opening of the
host.
Sweden
External Modems & Internal Modem Cards
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