Figure 36: SCB
SCB Slots
You can install one or two SCBs. The SCBs install horizontally into the front of the chassis
in the slots labeled 0 and 1/0 (the multifunction slot 1/0 can contain either SCB1, DPC0,
MPC0, or FPC0). If any slots are empty, you must install a blank panel.
SCB Redundancy
If two SCBs are installed, one SCB functions as the master SCB and the other as its
backup. If the master fails or is removed, the backup becomes the master.
SCB Components
Each SCB consists of the following components:
•
Chassis management Ethernet switch
•
I2C bus logic, used for low-level communication with each component
•
Component redundancy circuitry
•
Control Board/Routing Engine mastership mechanism
•
Gigabit Ethernet switch that is connected to the embedded CPU complex on all
components
•
Switch fabric—Provides the switching functions for the DPCs, FPCs, and MPCs
•
Control field-programmable gate array (FPGA)—Provides the Peripheral Component
Interconnect (PCI) interface to the Routing Engine
Copyright © 2017, Juniper Networks, Inc.98
MX240 3D Universal Edge Router Hardware Guide
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