Juniper JCS 1200 Hardware Manual page 174

Juniper Control System (JCS) 1200 Platform Hardware Guide
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If you reinstall a Routing Engine that you removed, you must install it in the same
Routing Engine bay from which you removed it. Some Routing Engine configuration
information and update options are established according to bay number. Reinstalling
a Routing Engine into a different Routing Engine bay from the one from which it
was removed can have unintended consequences, and you might have to reconfigure
the Routing Engine.
Related Topics
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Installing a JCS 1200 Routing Engine
Depending on the Routing Engine type and the optional devices that are installed
in it, one or more adjacent bays might be required.
When any Routing Engine or device is in any Routing Engine bay 7 through 12,
power modules must be installed in all four power bays.
To help ensure proper cooling, performance, and system reliability, make sure
that each Routing Engine bay on the front of the JCS 1200 platform contains a
Routing Engine, expansion unit, or Routing Engine filler. Do not operate a
JCS 1200 platform for more than 1 minute without a Routing Engine, expansion
unit, or Routing Engine filler in each Routing Engine bay.
Remove the filler from the bay, if one is installed (see "Removing a JCS 1200
Routing Engine" on page 140).
Make sure that the two release handles are in the open position.
Slide the Routing Engine into the bay until it stops.
Push the two release handles to the closed position.
Power on the Routing Engine.
Make sure that the power-on LED on the Routing Engine control panel is lit
continuously, indicating that the Routing Engine is receiving power and is turned
on.
If you are installing a new Routing Engine, write identifying information about
one of the user labels that comes with the Routing Engine; then place the label
on the JCS 1200 platform top bezel, just above the Routing Engine (see "Locating
the JCS 1200 Routing Engine Serial Number" on page 203).
Preventing Electrostatic Discharge Damage to the JCS 1200 Platform on page 154
JCS 1200 Routing Engine Description on page 24
JCS 1200 Routing Engine Control Panel Buttons and LEDs on page 25
Powering On a JCS 1200 Routing Engine on page 73
Powering Off a JCS 1200 Routing Engine on page 74
Locating the JCS 1200 Routing Engine Serial Number on page 203