Installation guide

11
Preventing Electrostatic Discharge Damage
OL-2189-01
General Safety Precaution and Maintenance Guidelines
Hot Swapping Line Cards
The 8xDMT can be hot swapped. Hot swapping allows you to remove, replace, and rearrange the line
cards without disconnecting the system power. When the system detects that you have added or removed
an 8xDMT, it automatically runs diagnostic and discovery routines and acknowledges the presence or
absence of the line card.
If you remove and replace an 8xDMT with another 8xDMT, the newly installed line card receives
the same provisioning as the original line card. The system resumes operation without any
operator intervention.
If an unprovisioned line card is installed for the first time, the system identifies it as present but
unprovisioned. Instructions for provisioning the line card are found in the appropriate software guide for
your chassis.
Preventing Electrostatic Discharge Damage
Proper ESD protection is required whenever you handle Cisco equipment. ESD damage, which can occur
when electronic cards or components are improperly handled, results in complete or intermittent
failures. Use an antistatic strap when you handle any card or component.
Follow these guidelines to prevent ESD damage:
• Always use an ESD ankle or wrist strap and ensure that the wrist strap makes good skin contact.
• Connect the equipment end of the strap to the ESD jack on the front of the chassis.
• When you install a component, use available ejector levers or captive installation screws to properly
seat the bus connectors in the backplane or midplane. These devices prevent accidental removal,
provide proper grounding for the system, and help ensure that bus connectors are properly seated.
• When you remove a component, use available ejector levers or captive installation screws to release
the bus connectors from the backplane or midplane.
• Avoid touching the printed circuit boards or connectors on the NI-2 cards or line cards.
• Place a removed component board-side-up on an antistatic surface or in a static-shielding
container. If you plan to return the component to the factory, immediately place it in a
static-shielding container.
• Avoid contact between the printed circuit boards and clothing. The wrist strap protects components
from ESD voltages on the body only; ESD voltages on clothing can still cause damage.
Caution Periodically check the resistance value of the antistatic strap. Ensure that the measurement is between 1
and 10 megohms.