Juniper Networks MX240 Manual de usuario descargar pdf (Pagina 41)

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.

■ Control 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.

■ Ethernet switch—Provides 1-Gbps link speeds between the Routing Engine and

the DPCs.

■ Circuits for chassis management and control.

■ Power circuits for the Routing Engine and SCB.

■ LEDs—Provide status (see “SCB LEDs” on page 13)

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 9 on page

13 describes the functions of the SCB LEDs.

Table 9: Switch Control Board LEDs

DescriptionStateColorLabel

Fabric is in active mode.On steadilyGreen

FABRIC

ACTIVE

SCB operates in fabric-only mode.On steadilyGreen

FABRIC

ONLY

SCB operates in fabric/control board mode.Off

SCB is online.On steadilyGreen

OK/FAIL

SCB is offline.Off

SCB has failed.On steadilyRed

Host Subsystem ■ 13

Chapter 2: Hardware Components

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Juniper Networks MX240 Manual de usuario Pagina 41