363-206-285
Issue3,June2001 Page9of12
DDM-2000 OC-3 MULTIPLEXER
Electrostatic Discharge (ESD)
Considerations
!
CAUTION:
Industry experience has shown that all integrated circuit packs can be damaged by
static electricity that builds up on work surfaces and personnel. The static charges are
produced by various charging effects of movement and contact with other objects.
Dry air allows greater static charges to accumulate. Higher potentials are measured
in areas with low relative humidity, but potentials high enough to cause damage can
occur anywhere.
The following precautions should be observed when handling circuit packs in order to
prevent damage by electrostatic discharge:
â– Assume all circuit packs contain solid state electronic components that can be
damaged by ESD. Use only Lucent Technologies manufactured UL recognized
circuit packs specified in the appropriate user/service manual in this system.
â– When handling circuit packs (storing, inserting, removing, etc.) or when working on
the backplane, always wear a grounded wrist strap or wear a heel strap and stand on
a grounded, static-dissipating floor mat. If a static-dissipating floor mat is used, be
sure that it is clean.
â– Handle all circuit packs by the faceplate or latch and by the top and bottom
outermost edges. Never touch the components, conductors, or connector pins.
â– Observe warning labels on bags and cartons. Whenever possible, do not remove
circuit packs from antistatic packaging until ready to insert them into slots.
â– If possible, open all circuit packs at a static-safe work position, using properly
grounded wrist straps and static-dissipating table mats. If a static-dissipating table
mat is used, be sure that it is clean.
â– Always store and transport circuit packs in static-safe packaging. Shielding is not
required unless specified.
â– Keep all static-generating materials such as food wrappers, plastics, and styrofoam
containers away from all circuit packs. Upon removal from the bay, immediately put
circuit packs into static-safe packages.
â– Whenever possible, maintain relative humidity above 20 percent.
To reduce the possibility of ESD damage, shelves are equipped with grounding jacks to
enable personnel to ground themselves using wrist straps (see Figure 2) while handling
circuit packs or working on a shelf(s). The jacks for connection of wrist straps are located at
the lower right-hand corner of each shelf and are labeled. When grounding jacks are not
provided, an alligator clip adapter enables connection to bay frame ground.
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