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Juniper was the first North American IP routing vendor to achieve the prestigious TL 9000 certification by the Quality of Excellence for Suppliers of Telecommunications (QuEST) Forum in the router category, for design, development, provision and service and support.
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MX960 Switch Control Board (SCB) Description
The Switch Control Board (SCB) provides the following functions:
- Powers on and powers off DPCs and FPCs
- 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 and FPCs 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).
Table 1: SCB Slot Mapping and Functionality
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 and FPCs
- 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 and FPCs
- Circuits for chassis management and control
- Power circuits for the Routing Engine and SCB
- LEDs—Provide status (see Switch Control Board LEDs)
