Juniper MX2010, Hardware Manual

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Table 19: Components on the RE-MX2000-1800x4 (continued)
Description Label Function No.
There is one bicolor LED for each external clock
interface—BITS and GPS.
GPS, and BITS 9
These ports are used for hardware diagnostics
and are for Juniper-internal use only.
XGE-0 and XGE-1 10
There is one bicolor LED for each CB-RE
control. The ONLINE LED indicates that the
CB-RE is transitioning online and functioning
properly. The MASTER LED indicates that this
board is a master Control Board and Routing
Engine (CB-RE) , and the OK/FAIL LED indicates
the CB-RE has failed.
ONLINE, MASTER, and
OK/FAIL
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RE-MX2000-1800x4 CB-RE Components
Each CB-RE consists of the following components:
•
External clock interface—Allows BITS or GPS clock source input to the centralized timing circuit, or
allows centralized timing to be output to BITS or GPS.
•
1000Base-T Ethernet controller
•
Circuits for chassis management and control.
•
Power circuits for the CB-RE.
•
Control FPGA—Provides the Peripheral Component Interconnect (PCI) interface to the routing engine.
•
Gigabit Ethernet switch that is connected to the embedded CPU complex on all components.
•
CPU—Runs Junos OS to maintain the router's routing tables and routing protocols.
•
I2C bus logic, used for low-level communication with each component.
•
DRAM—Provides storage for the routing and forwarding tables and for other routing engine processes.
•
Component redundancy circuitry.
•
USB port—Provides a removable media interface through which you can install the Junos OS manually.
Junos OS supports USB version 1.0.
•
CompactFlash card—Provides primary storage for software images, configuration files, and microcode.
The CompactFlash card is fixed and is inaccessible from outside the router.
•
Solid State Disk (non-removable)—Provides secondary storage for log files, memory dumps, and rebooting
the system if the CompactFlash card fails.
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