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Home > Support > Technical Documentation > MX Series Routers > MX960 Router Hardware > MX960 Switch Control Board Description
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Related Documentation

  • MX Series
  • MX960 Host Subsystem Description
  • MX960 Routing Engine Description
  • MX960 Switch Control Board LEDs
  • Replacing an MX960 SCB
 

MX960 Switch Control Board Description

The Switch Control Board (SCB) provides the following functions:

  • 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

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).

Table 1: SCB Slot Mapping and Functionality

Functionality

Slot 0

Slot 1

Slot 2/6

Full fabric

SCB

Routing Engine

SCB

–

Full fabric and redundant Routing Engine

SCB

Routing Engine

SCB

Routing Engine

–

Redundant fabric and Routing Engine

SCB

Routing Engine

SCB

Routing Engine

SCB

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, 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
 

Related Documentation

  • MX Series
  • MX960 Host Subsystem Description
  • MX960 Routing Engine Description
  • MX960 Switch Control Board LEDs
  • Replacing an MX960 SCB
 

Published: 2011-09-08

 
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