Chapter 5 Host Subsystem Components And Descriptions; M120 Host Subsystem Description - Juniper M120 Hardware Manual

CHAPTER 5
Host Subsystem Components and
Descriptions

M120 Host Subsystem Description

Related
Documentation
Copyright © 2018, Juniper Networks, Inc.
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
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
The host subsystem consists of the following components:
Taking the M120 Host Subsystem Offline on page 267
Maintaining the M120 Host Subsystem on page 266
M120 Routing Engine Description on page 22
14.
21