Risk Of Equipment Damage - Nortel Passport 15000 Hardware Installation And Maintenance

Risk of equipment damage

Fastening screws to a frame or rack
Passport 15000, 20000 Hardware Installation, Maintenance, and Upgrade
This section provides an overview of common equipment damage risks when
working with a Passport switch.
• When an FP receives a LASER signal that exceeds its range of receive
sensitivity, the FP can be damaged or fail. The ranges for transmit and
receive are not always the same on an optical FP. Always check whether
each FP signaling connection requires an attenuator.
• The protection covers on fabric cards are to prevent accidental bending
of any connector pins. Once a cover is removed, ensure that nothing
contacts the rows of exposed pins. Use the procedure "Checking the
backplane pins" (page 258) to ensure there are no bent pins on the
backplane of the Passport 15000.
• Where compliance with local electrical specifications, guidelines, or
standards conflicts with a Nortel Networks procedure, contact your
Nortel Networks service representative.
• Power cycling the breakers can be done on a Passport 15000 or 20000
without damaging equipment. Power cycling can cause a loss of switch
traffic depending on the hardware and software configurations for
redundancy and on the amount of traffic throughput as each breaker is
toggled.
When fastening screws for the first time into the front surface of the vertical
uprights of a NEBS 2000 frame or a mounting apparatus that requires self-
tapping (thread-forming) screws, ensure the flat-tipped screw is perpendicular
to the hole. On the uprights of a NEBS 2000 frame, dimples in the silvery
grounding strip indicate where the unthreaded screw holes are located. To see
dimples, run and press your finger along the strip. When turning a thread-
forming (self-tapping) screw into a dimple for the first time, exert enough
force to puncture the strip.
When fastening screws back into threaded holes, especially in the front
surface of a frame upright, fully seat the fastener threads perpendicularly in
the hole before turning it. The tapered tip of the fastener should allow you to
gently start threading by using your fingers.
Chapter 2 Safety considerations and best practices 57
5.2S2