S320 OCS Repair and Diagnostics Field Guide
Doc. Part No. 460163-00
May 5, 2015
Rev. B1
Page 11 of 22
To reduce the possibility of ESD damage to equipment, most racks provide grounding jacks into
which anti-static wrist straps can be plugged. Observe the following precautions whenever you
are working with the S320 Optical Circuit Switch:
Always wear a tested-and-verified grounded wrist strap to prevent ESD, and be sure the
wrist strap is plugged into a grounding jack.
Observe warning labels on bags and cartons. Whenever possible, do not remove a
module from its antistatic packaging until it is to be installed in the rack.
Always store and transport any electronic module in antistatic packaging.
Keep all static-generating materials (such as plastic foil wrappers, other plastics,
Styrofoam and cardboard containers) away from the switch.
Maintain ambient humidity within the 20% to 85% limits specified for S320 operation.
2.3
Optical Connections
2.3.1
Keeping Fiber Connectors Clean
Optical fiber connectors require special handling to mitigate contamination from dust and
debris that could increase insertion loss and return loss. For instance, contamination during
connection of the 8-degree-angled surface of APC fiber can increase insertion loss and back
reflection. Once a pair of clean connectors is mated, however, it is unlikely that further
contamination will occur until the next time the fibers are disconnected.
To minimize the effects of particulate contamination, the surface of the connector end must be
cleaned before connection. This cleaning operation is extremely critical, as an improperly
prepared optical surface can cause performance degradation.
2.3.2
Optical Fiber Bend Radius
An optical fiber or fiber-optic cable should not be bent below the Minimum Bend Radius (MBR.)
Bending a fiber below the MBR can result in damage to the fiber, which can adversely affect
S320 performance. In general, any improper handling of optical fiber and cables has the
potential to reduce system performance. As such, make sure to observe the following
precautions when working with fiber and cable:
Keep optical surfaces clean; only trained personnel should clean optical cables
and connectors.
When optical cables or optical connectors are not connected, make sure they are
capped. Be sure to use clean caps.
Handle fiber cables as little as possible.
