14
Obtaining Service and Support
Warning:
Hazardous network voltages are present in WAN ports regardless of whether power to the
SmartNode is ON or OFF. To avoid electric shock, use caution when near WAN ports. When
detaching cables, detach the end away from the SmartNode first.
Warning:
Before opening the chassis, disconnect the telephone network cables to avoid contact with
telephone line voltages.
Warning:
Do not work on the system or connect or disconnect cables during periods of lightning
activity.
Warning:
Ultimate disposal of this equipment must be handled according to all applicable national
laws and regulations.
Preventing Electrostatic Discharge Damage
When starting to install interface cards place the interface card on its shielded plastic bag if you lay it
on your bench.
Caution Electrostatic Discharge:
Electrostatic Discharge (ESD) can damage equipment and impair
electrical circuitry. It occurs when electronic printed circuit cards are improperly handled and can
result in complete or intermittent failures. Always follow ESD prevention procedures when
removing and replacing cards. Ensure that the SmartNode chassis is electrically connected to earth
ground. Wear an ESD-preventive wrist strap, ensuring that it makes good skin contact. Connect the
clip to an unpainted surface of the chassis frame to safely channel unwanted ESD voltages to ground.
To properly guard against ESD damage and shocks, the wrist strap and cord must operate
effectively. If no wrist strap is available, ground yourself by touching the metal part of the chassis.
Caution:
For safety, periodically check the resistance value of the antistatic wrist strap, which should
be between 1 and 10 M
Ω
(Ohm).
General Observations
•
Clean the case with a soft slightly moist anti-static cloth
•
Place the unit on a flat surface (or optionally in a rack for the SN2x00) and ensure free air
circulation
•
Avoid exposing the unit to direct sunlight and other heat sources
•
Protect the unit from moisture, vapors and aggressive liquids
Hardware Installation Guide, Revision 3.11
