User's Manual

Preparing for the Installation
8
Safety with Electricity
Warning!
To avoid electric shock, do not connect safety extra-low voltage (SELV)
circuits to telephone-network voltage (TNV) circuits. LAN ports contain
SELV circuits, and WAN ports contain TNV circuits. Some LAN and
WAN ports both use RJ45 connectors; incorrect interconnection can cause
equipment damage. Use caution when connecting cables.
Warning!
Before working on equipment that is connected to power lines, remove
jewelry (including rings, necklaces, and watches). Metal objects will heat
up when connected to power and ground and can cause serious burns or
weld the metal object to the terminals.
Warning!
Hazardous network voltages are present in WAN ports regardless of
whether power to the attached equipment is OFF or ON. To avoid electric
shock, use caution when working near WAN ports. When detaching
cables, detach the end away from the router first.
Warning!
Before opening the NCU or ACU, disconnect the telephone-network
cables to avoid contact with telephone-network voltages.
Warning!
Do not touch the power supply when the power cord is connected. For
systems with a power switch, line voltages are present within the power
supply even when the power switch is off and the power cord is
connected. For systems without a power switch, line voltages are present
within the power supply when the power cord is connected.