MX80 Base Board Description
The base board is located in the center of the chassis and forms the rear of the MIC card cage. The base board is not replaceable. The MICs and power supplies install into the base board from the front of the chassis. Data packets are transferred across the base board from the MIC to the Packet Forwarding Engine, and from the Packet Forwarding Engine across the base board to the destination MIC.
The base board provides the following functions:
- Powers on and powers off MICs
- Controls clocking, system resets, and booting
- Monitors and controls system functions, including fan speed, board power status, PDM status and control, and the front panel
- Provides interconnections to all the MICs within the chassis
Base Board Components
The base board consists of the following components:
- Junos Trio chipset—Manages packet data memory, queuing systems, and performs packet lookup and encapsulation.
- MIC connectors for both built-in and replaceable MICs including a WAN interface for the built-in 10-Gigabit Ethernet MIC.
- Intake and exhaust temperature sensors.
- Circuits for chassis management and control.
- Power circuits for the system components and Ethernet interfaces.
- Routing Engine processor, which includes a 1.33-GHz CPU, and 2 GB of SDRAM.
- 2 4-GB NAND flash storage devices.
- Packet Forwarding Engine processor, which includes a 1-GHz CPU, a system controller, and 1Â GB of SDRAM. Connects to the Routing Engine through a Gigabit Ethernet link.
- Clock logic.
