with fast switchover times and higher bandwidth PFEs provide support for larger numbers
of PICs.
Related
Documentation
M120 Router Chassis Description on page 7
•
•
M120 Router Physical Specifications on page 82
•
M120 Router Environmental Specifications on page 86
•
M120 Router Power Requirements on page 88
M120 Component Redundancy
A fully configured router is designed so that no single point of failure can cause the entire
system to fail. Only a fully configured router provides complete redundancy. All other
configurations provide partial redundancy. The following major hardware components
are redundant:
•
Host subsystem—The host subsystem requires a Routing Engine to be installed directly
into the CB. The router can have one or two host subsystems. If two host subsystems
are installed, one functions as the master and the other functions as the backup. If the
master host subsystem (or either of its components) fails, the backup can take over
as the master.
•
Power supplies—A router with two AC power supplies or two DC power supplies is fully
power redundant. In both AC and DC configurations, the power supplies share the load
almost evenly.
CAUTION:
Mixing AC and DC power supplies is not supported. The first
power supply powered on will electrically disable the second power supply
without damaging any components in the system.
•
Cooling system—The cooling system has redundant components, which are controlled
by the host subsystem. If one of the fans fails, the host subsystem increases the speed
of the remaining fans to provide sufficient cooling for the router indefinitely.
Related
Documentation
•
M120 Router Chassis Description on page 7
•
M120 Host Subsystem Description on page 21
•
M120 AC Power Supply Description on page 72
•
M120 DC Power Supply Description on page 72
•
M120 Cooling System Description on page 19
Copyright © 2018, Juniper Networks, Inc.
4
M120 Multiservice Edge Router Hardware Guide
Summary of Contents for M120
Page 12: ...Copyright 2018 Juniper Networks Inc xii M120 Multiservice Edge Router Hardware Guide ...
Page 20: ...Copyright 2018 Juniper Networks Inc xx M120 Multiservice Edge Router Hardware Guide ...
Page 26: ...Copyright 2018 Juniper Networks Inc xxvi M120 Multiservice Edge Router Hardware Guide ...
Page 28: ...Copyright 2018 Juniper Networks Inc 2 M120 Multiservice Edge Router Hardware Guide ...
Page 32: ...Copyright 2018 Juniper Networks Inc 6 M120 Multiservice Edge Router Hardware Guide ...
Page 44: ...Copyright 2018 Juniper Networks Inc 18 M120 Multiservice Edge Router Hardware Guide ...
Page 76: ...Copyright 2018 Juniper Networks Inc 50 M120 Multiservice Edge Router Hardware Guide ...
Page 104: ...Copyright 2018 Juniper Networks Inc 78 M120 Multiservice Edge Router Hardware Guide ...
Page 106: ...Copyright 2018 Juniper Networks Inc 80 M120 Multiservice Edge Router Hardware Guide ...
Page 118: ...Copyright 2018 Juniper Networks Inc 92 M120 Multiservice Edge Router Hardware Guide ...
Page 136: ...Copyright 2018 Juniper Networks Inc 110 M120 Multiservice Edge Router Hardware Guide ...
Page 144: ...Copyright 2018 Juniper Networks Inc 118 M120 Multiservice Edge Router Hardware Guide ...
Page 154: ...Copyright 2018 Juniper Networks Inc 128 M120 Multiservice Edge Router Hardware Guide ...
Page 176: ...Copyright 2018 Juniper Networks Inc 150 M120 Multiservice Edge Router Hardware Guide ...
Page 204: ...Copyright 2018 Juniper Networks Inc 178 M120 Multiservice Edge Router Hardware Guide ...
Page 208: ...Copyright 2018 Juniper Networks Inc 182 M120 Multiservice Edge Router Hardware Guide ...
Page 220: ...Copyright 2018 Juniper Networks Inc 194 M120 Multiservice Edge Router Hardware Guide ...
Page 238: ...Copyright 2018 Juniper Networks Inc 212 M120 Multiservice Edge Router Hardware Guide ...
Page 264: ...Copyright 2018 Juniper Networks Inc 238 M120 Multiservice Edge Router Hardware Guide ...
Page 280: ...Copyright 2018 Juniper Networks Inc 254 M120 Multiservice Edge Router Hardware Guide ...
Page 286: ...Copyright 2018 Juniper Networks Inc 260 M120 Multiservice Edge Router Hardware Guide ...
Page 288: ...Copyright 2018 Juniper Networks Inc 262 M120 Multiservice Edge Router Hardware Guide ...
Page 308: ...Copyright 2018 Juniper Networks Inc 282 M120 Multiservice Edge Router Hardware Guide ...
Page 320: ...Copyright 2018 Juniper Networks Inc 294 M120 Multiservice Edge Router Hardware Guide ...
Page 322: ...Copyright 2018 Juniper Networks Inc 296 M120 Multiservice Edge Router Hardware Guide ...
Page 336: ...Copyright 2018 Juniper Networks Inc 310 M120 Multiservice Edge Router Hardware Guide ...
Page 344: ...Copyright 2018 Juniper Networks Inc 318 M120 Multiservice Edge Router Hardware Guide ...
Page 354: ...Copyright 2018 Juniper Networks Inc 328 M120 Multiservice Edge Router Hardware Guide ...
Page 382: ...Copyright 2018 Juniper Networks Inc 356 M120 Multiservice Edge Router Hardware Guide ...