Replacing A Pcg In An M40E Router; Removing A Pcg In An M40E Router; Figure 106: Connecting Fiber-Optic Cable To A Pic In An M40E Router - Juniper M40E Hardware Manual

M40e Multiservice Edge Router Hardware Guide
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Replacing a PCG in an M40e Router

196
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Figure 106: Connecting Fiber-Optic Cable to a PIC in an M40e Router

M40e Field-Replaceable Units (FRUs) on page 157
Tools and Parts Required to Remove Components from an M40e Router on page 309
M40e Flexible PIC Concentrators (FPCs) Description on page 13
Maintaining M40e FPCs on page 132
Troubleshooting FPCs on the M40e Router on page 152
During normal operation, both PCGs generate a 125-MHz clock signal, but only one is
designated as the master. The modules and ASICs in the Packet Forwarding Engine that
use the clock signal to gate packet processing use only the signal from the master PCG.
For information about determining which PCG is the master, see "Maintaining the M40e
PCGs" on page 141.
PCGs are hot-pluggable, as described in "M40e Field-Replaceable Units (FRUs)" on
page 157. Removal or failure of the backup PCG does not affect router function. If the
master PCG fails or is removed from the chassis, however, the Packet Forwarding Engine
resets so that the components start using the signal from the other PCG (which becomes
the master). The Packet Forwarding Engine cannot accept incoming packets until each
PFE component, including the SFM and FPCs, resets to recognize the new master PCG.
This can result in traffic halting for several minutes.
Removing a PCG in an M40e Router on page 196
Installing a PCG in an M40e Router on page 197

Removing a PCG in an M40e Router

To remove a PCG (see Figure 107 on page 197):
Place an electrostatic bag or antistatic mat on a flat, stable surface.
1.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
2.
the strap to one of the ESD points on the chassis. For more information about ESD,
see "Preventing Electrostatic Discharge Damage to an M Series, MX Series, or T Series
Router" on page 232.
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