•
1000Base-T Ethernet controller—Provides a 1-Gbps Ethernet link between the Routing
Engines
•
Ethernet switch—Provides 1-Gbps link speeds between the Routing Engine and the
DPCs, FPCs, and MPCs
•
Circuits for chassis management and control
•
Power circuits for the Routing Engine and SCB
•
LEDs—Provide status
Related
Documentation
MX240 Host Subsystem Description on page 21•
• MX240 Routing Engine Description on page 23
MX240 SCB LEDs
Three LEDs on the SCB indicate the status of the SCB. The LEDs, labeled FABRIC ACTIVE,
FABRIC ONLY, and OK/FAIL, are located directly on the SCB. Table 57 on page 99 describes
the functions of the SCB LEDs.
Table 57: SCB-MX LEDs
DescriptionStateColorLabel
Fabric is in active mode.On steadilyGreenFABRIC
ACTIVE
SCB-MX operates in fabric-only mode.On steadilyGreenFABRIC
ONLY
SCB-MX operates in fabric/control board mode.Off–
SCB-MX is online.On steadilyGreenOK/FAIL
SCB-MX has failed.On steadilyRed
SCB-MX is offline.Off–
Related
Documentation
MX240 Host Subsystem Description on page 21•
• MX240 SCB Description on page 97
• MX240 Routing Engine Description on page 23
MX240 SCBE Description
The MX SCBE serves the carrier Ethernet services router and carrier Ethernet transport
markets that require higher-capacity traffic support demanding greater interface density
(slot and capacity scale), as well as improved services. The upgraded SCB is supported
on MX960, MX480, and MX240 routers. Some key attributes of the MX SCBs are:
99Copyright © 2017, Juniper Networks, Inc.
Chapter 8: Switch Fabric Components and Descriptions
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