The host subsystem is composed of a Routing Engine installed directly into a slot on the faceplate of the
SCB. When there is no Routing Engine is a SCB, its slot must be covered with a blank panel.
Figure 38: Switch Control Board SRX5K-SCB
Each SCB consists of the following components:
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Chassis management Ethernet switch.
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I2C bus logic, used for low-level communication with each component.
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Component redundancy circuitry.
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Gigabit Ethernet switch that is connected to the embedded CPU complex on all components.
•
Switch fabric—Provides the switching functions for the IOCs.
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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.
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Ethernet switch—Provides 1-Gbps link speeds between the Routing Engine and the IOCs.
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Circuits for chassis management and control.
•
Power circuits for the Routing Engine and SCB.
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SCB with slot for Routing Engine
•
Maximum throughput: 75 Gbps per slot
Description
•
Junos OS Release 9.2 and laterSoftware release
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