CHAPTER 8
Switch Fabric Components and
Descriptions
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MX240 SCB Description on page 97
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MX240 SCB LEDs on page 99
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MX240 SCBE Description on page 99
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MX240 SCBE LEDs on page 101
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MX240 SCBE2 Description on page 102
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MX240 SCBE2 LEDs on page 104
MX240 SCB Description
The SCB provides the following functions:
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Powers on and powers off DPCs, FPCs, and MPCs
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Controls clocking, system resets, and booting
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Monitors and controls system functions, including fan speed, board power status, PDM
status and control, and the craft interface
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Provides interconnections to all the DPCs, FPCs, and MPCs within the chassis through
the switch fabrics integrated into the SCB
The Routing Engine installs directly into a slot on the SCB (see Figure 36 on page 98).
97Copyright © 2017, Juniper Networks, Inc.
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