MX SCBE Components
Each MX SCBE consists of the following components:
•
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
•
External clock interface—Allows BITS or GPS clock source input to the centralized
timing circuit, or allows centralized timing to be output to BITS or GPS
•
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
•
1000Base-T Ethernet controller—Provides a 1-Gbps Ethernet link between the Routing
Engines
•
Circuits for chassis management and control
•
Power circuits for the Routing Engine and SCBE
•
LEDs—Provide status of the SCBE and clocking interface
Related
Documentation
MX240 SCB Description on page 97•
• MX240 SCBE LEDs on page 101
• Upgrading an MX240 SCB on page 347
MX240 SCBE LEDs
The FABRIC ACTIVE, FABRIC ONLY, and OK/FAIL LEDs indicate the status of the MX
SCBE. The BITS, GPS, and UTI LEDs, located next to the EXT CLK port, indicate the status
of the respective clocking interface. Table 58 on page 101 describes the functions of the
MX SCBE LEDs.
Table 58: MX SCBE LEDs
DescriptionStateColorLabel
Fabric is in active mode.On steadilyGreenFABRIC
ACTIVE
MX SCBE operates in fabric-only mode.On steadilyGreenFABRIC
ONLY
MX SCBE operates in fabric/control board mode.Off–
101Copyright © 2017, Juniper Networks, Inc.
Chapter 8: Switch Fabric Components and Descriptions
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