List of Figures
Part 1 Overview
Chapter 3 Chassis Components and Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 1: Front View of a Fully Configured M120 Router Chassis . . . . . . . . . . . . . . . . 8
Figure 2: Rear View of a Fully Configured AC-Powered M120 Router Chassis . . . . . 8
Figure 3: Rear View of a Fully Configured DC-Powered M120 Router Chassis . . . . . 9
Figure 4: M120 Midplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 5: M120 Cable Management System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 6: Front Panel of the M120 Craft Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Chapter 4 Cooling System Components and Descriptions . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 7: Airflow Through the M120 Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 8: M120 Front Fan Tray . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 9: M120 Rear Fan Tray . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Chapter 5 Host Subsystem Components and Descriptions . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 10: M120 Routing Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 11: RE-A-1800x2 Routing Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 12: USB Memory Device in an M120 Routing Engine . . . . . . . . . . . . . . . . . . . 24
Figure 13: RE-A-1800x2 Routing Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 14: USB Memory Device in an Routing Engine . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 15: M120 CB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Chapter 6 Line Card Components and Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 16: FPC and CFPCs Installed in an M120 Router Chassis . . . . . . . . . . . . . . . 52
Figure 17: FPC1, FPC2, and FPC3 for the M120 Router . . . . . . . . . . . . . . . . . . . . . . . 53
Figure 18: FPC and CFPCs Installed in an M120 Router Chassis . . . . . . . . . . . . . . . 55
Figure 19: Ethernet 10GBASE XFP CFPC for the M120 Router . . . . . . . . . . . . . . . . 55
Chapter 7 Power System Components and Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . 71
Figure 20: M120 DC Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Figure 21: M120 AC Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Chapter 8 Switch Fabric Components and Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . 75
Figure 22: M120 FEB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Part 2 Site Planning, Preparation, and Specifications
Chapter 9 Preparation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Figure 23: Typical Open-Frame Rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Figure 24: M120 Chassis Dimensions and Clearance Requirements . . . . . . . . . . . 86
Figure 25: M120 DC Power and Grounding Cable Lug . . . . . . . . . . . . . . . . . . . . . . 88
Chapter 10 AC Power Requirements and Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 93
xiiiCopyright © 2018, Juniper Networks, Inc.
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