MX SCBE Components
Related
Documentation
MX240 SCBE LEDs
Copyright © 2016, Juniper Networks, Inc.
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
MX240 SCB Description on page 91
MX240 SCBE LEDs on page 95
Upgrading an MX240 SCB on page 327
The
,
FABRIC ACTIVE
FABRIC ONLY
SCBE. The
,
, and
BITS
GPS
of the respective clocking interface.
MX SCBE LEDs.
Table 54: MX SCBE LEDs
Label
Color
Green
FABRIC
ACTIVE
Green
FABRIC
ONLY
–
Chapter 8: Switch Fabric Components and Descriptions
, and
LEDs indicate the status of the MX
OK/FAIL
LEDs, located next to the
UTI
Table 54 on page 95
State
Description
On steadily
Fabric is in active mode.
On steadily
MX SCBE operates in fabric-only mode.
Off
MX SCBE operates in fabric/control board mode.
port, indicate the status
EXT CLK
describes the functions of the
95