MX960 Switch Control Board Description

• Powers on and powers off DPCs, FPCs, and MPCs
• Controls clocking, system resets, and booting
• Monitors and controls system functions, including fan speed, board power status, PDM status and control, and the craft interface
• Provides interconnections to all the DPCs, FPCs, and MPCs within the chassis through the switch fabrics integrated into the SCB

The Routing Engine installs directly into a slot on the SCB (see Figure 1).

Figure 1: SCB

SCB Slots

You can install up to three. The SCBs install vertically into the front of the chassis in the slots labeled 0, 1, and 2/6. If any slots are empty, you must install a blank panel.

SCB Redundancy

SCBs installed in slots 0 and 1 provide nonredundant fabric connections. An SCB installed in slot 2/6, in conjunction with SCBs in slots 0 and 1, provides redundant fabrics, but the Routing Engine installed on it receives no power and provides no additional routing functions. If no SCB is installed in slot 2/6, you must install a blank panel in the slot (see Table 1).

SCB 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, FPCs, and MPCs
• 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, FPCs, and MPCs
• Circuits for chassis management and control
• Power circuits for the Routing Engine and SCB
• LEDs—Provide status