Juniper M120 - Line Card Components and Descriptions; M120 Flexible PIC Concentrators (FPCs) Description

Related
Documentation
• M120 Routing Engine LEDs on page 25
• M120 Routing Engine Interface Ports and Status Indicators on page 28
• Maintaining the M120 Host Subsystem on page 266
• Replacing an M120 Routing Engine on page 195
• Routing Engine Interface Cable and Wire Specifications for the M120 Router on page 105
M120 Routing Engine LEDs
Each Routing Engine has one LED that indicates its status. The LED, labeled ONLINE, is
located directly on the faceplate of the Routing Engine. Table 9 on page 25 describes
the functions of the Routing Engine LED.
Table 9: M120 Routing Engine LED
DescriptionStateColorLabel
Routing Engine is transitioning online.
Routing Engine is functioning normally.
Blinking
On steadily
GreenONLINE
Routing Engine has failed.On steadilyRed
Hard disk is being accessed.BlinkingGreenHDD
Related
Documentation
M120 Routing Engine Description on page 22•
• M120 Routing Engine Interface Ports and Status Indicators on page 28
• Maintaining the M120 Host Subsystem on page 266
• Replacing an M120 Routing Engine on page 195
• Routing Engine Interface Cable and Wire Specifications for the M120 Router on page 105
M120 RE-A-1800x2 Routing Engine Description
•
Routing Engine Components on page 25
•
Routing Engine Boot Sequence on page 27
Routing Engine Components
The Routing Engine (shown in Figure 13 on page 26 ) consists of the following components:
•
CPU—Runs Junos OS to maintain the router's routing tables and routing protocols.
•
DRAM—Provides storage for the routing and forwarding tables and for other Routing
Engine processes.
25Copyright © 2018, Juniper Networks, Inc.
Chapter 5: Host Subsystem Components and Descriptions