3Com Dual 56K User Manual page 6

If the unit shows signs of a distinct change in performance.
Never install telephone wires during a lightning storm, or install telephone connection
sockets in wet locations, unless the socket is specifically designed for wet locations.
Do not touch uninstalled telephone wires or terminals unless the telephone line has been
disconnected at the network interface. Always exercise caution when installing or modifying
telephone lines.
Do not use a telephone, which is connected to the unit, to report a gas leak in the vicinity of
the leak.
Do not spill food or liquids on the unit. If the unit gets wet, isolate the electrical supply and
contact your 3Com reseller.
Do not push any objects into the openings of the unit. Doing so can cause fire or electric
shock by shorting out internal components.
Only equipment approved for use by your telecom company can be connected to the
telephone port.
Avoid using a telephone, which is connected to the unit (other than a cordless type), during
an electrical storm.
Equipment connected to the telephone port must be located in the same building as the
unit.
Be sure nothing rests on the units system cables and that the cables are not located where
they can be stepped on and cause damage to the unit.
Keep the unit away from radiators and heat sources. Allow 25mm (1inch) around the unit to
provide adequate air circulation.
Install the unit in a clean area that is free from dust or extreme temperatures.
Allow a clearance gap of at least a 150 mm (6 inches) from the rear panel of the unit, to
allow for cable access.
Interconnecting directly, or by way of other apparatus, to ports complying with SELV
requirements may produce hazardous conditions on the network. Advice should be sought
from a competent engineer before such a connection is made.