Hot-Swapping Modules; Protecting Modules And Slots - Juniper E120 - RELEASE 11.1.X HARDWARE GUIDE 3-25-2010 Hardware Manual

in place. The slot diagnostics run when a line module is installed in a chassis slot. If
a compatible IOA module is not present, the diagnostics fail, and you need to remove
and reinsert the line module.

Hot-Swapping Modules

The router supports hot-swapping of line modules and IOAs. Hot-swapping enables
you to add or remove a line module without powering down the system. IOAs that
support hot-swapping enable you to add or remove an IOA without rebooting the
line module. See Table 4 on page 32 for a list of hot-swappable IOAs.

Protecting Modules and Slots

The E320 router has two ESD (electrostatic discharge) grounding jacks. The front
jack is located below the air filter bezel in the center of the router. The rear jack is
located in the upper-right corner of the chassis. The E120 router has one ESD
grounding jack located in the upper-right corner of the chassis in the rear. To prevent
damage from electrostatic discharge, wear an antistatic wrist strap and connect it to
one of the jacks when handling components.
To protect the modules, IOAs, and slots when installing components, observe the
following guidelines:
CAUTION: When handling components, use an antistatic wrist strap connected to
one of the router's ESD grounding jacks. This action helps to protect the module
from damage by electrostatic discharge.
CAUTION: Always handle a module by its edges. Do not touch the components, pins,
leads, or solder connections.
CAUTION: If you meet strong resistance when attempting to seat a module using
the ejectors, remove it from the chassis and confirm that the slot is designed to hold
the module. Also, be sure that you have aligned the top and bottom edges in the
correct matching card guides.
CAUTION: Be sure to cover every empty slot with a blank filler panel to protect the
system from dust or other foreign substances and to ensure proper system cooling.
CAUTION: Do not discard the antistatic bag. When a module is not in use, store it
in an antistatic bag.
Chapter 4: Installing Modules
37
Overview