About This Document
Issue 8.0 July 2002
xxxix
exposure distance. However, technicians removing or replacing
regenerators should not stare or look directly into the vacant regenerator
slot with optical instruments or magnifying lenses. (Normal eyewear or
indirect viewing instruments, such as Find-R-Scope are not considered
magnifying lenses or optical instruments.)
â– Only authorized, trained personnel should use the lightwave test
equipment during installation or servicing, since this equipment contains
semiconductor lasers. (Some examples of lightguide test equipment are
optical time domain reflectometers (OTDRs), Hand-Held Loss Test Sets,
and Feature Finders.)
â– Under no circumstances should any personnel scan a fiber with an optical
test set without verifying that all lightwave sources on the fiber are turned
off.
â– All unauthorized personnel should be excluded from the immediate area of
lightwave transmission systems during installation and service.
Consult ANSI Z136.1, American National Standard for Safe Use of Lasers, for
guidance on the safe use of lasers in the workplace.
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.
Observe the following precautions when handling circuit packs to prevent damage
by electrostatic discharge:
â– Assume all circuit packs contain solid-state electronic components that can
be damaged by ESD.
â– When handling circuit packs (storing, installing, 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.
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 all 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.
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