Juniper M120 - Host Subsystem Components and Descriptions; M120 Host Subsystem Description

CHAPTER 5
Host Subsystem Components and
Descriptions
•
M120 Host Subsystem Description on page 21
•
M120 Routing Engine Description on page 22
•
M120 Routing Engine LEDs on page 25
•
M120 RE-A-1800x2 Routing Engine Description on page 25
•
RE-A-1800 Routing Engine LEDs on page 27
•
M120 Routing Engine Interface Ports and Status Indicators on page 28
•
Routing Engine Specifications on page 29
•
Supported Routing Engines by Router on page 33
•
M120 Control Board (CB) Description on page 47
•
M120 Control Board (CB) LEDs on page 48
M120 Host Subsystem Description
The host subsystem provides the routing and system management functions of the
router. You can install one or two host subsystems on the router. Each host subsystem
functions as a unit; the Routing Engine must be installed directly into the Control Board.
NOTE: We recommend you install two host subsystems for redundant
protection. If you install only one host subsystem, we recommend you install
it in slot CB0.
Each host subsystem has three LEDs that display its status. The host subsystem LEDs
are located in the middle of the craft interface. For more information about the host
subsystem LEDs, see “Host Subsystem LEDs on the M120 Craft Interface” on page 14.
The host subsystem consists of the following components:
Related
Documentation
Taking the M120 Host Subsystem Offline on page 267•
• Maintaining the M120 Host Subsystem on page 266
• M120 Routing Engine Description on page 22
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