Mx240 Component Redundancy - Juniper MX240 Hardware Manual

Table 5: MX240 Router Hardware Components and CLI Terminology (continued)
Component
DC power supply
Power supply blank
panel
SEE ALSO
MX240 System Overview | 29
MX240 DPC Port and Interface Numbering | 115
MX240 MIC Port and Interface Numbering | 150
MX240 PIC Port and Interface Numbering | 126
MX Series Router Interface Names

MX240 Component Redundancy

The MX240 chassis provides redundancy and resiliency. The hardware system is fully redundant, including
power supplies, Routing Engines, and SCBs.
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 consists of a Routing Engine functioning together with an SCB.
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. To operate, each host subsystem requires a
Routing Engine installed directly into in an SCB.
In the high-line (220 V) AC power configuration, the MX240 router contains one or two AC power
supplies, located horizontally at the rear of the chassis in slots PEM0 and PEM2 (left to right). The
high-line configuration requires one power supply, with the second power supply providing redundancy.
Hardware Model Number
PWR-MX480-DC
PWR-MX480-1600-DC
PWR-MX480-2400-DC
PWR-BLANK-MX960
CLI Name
DC Power Entry Module
DC Power Entry Module
DC 2.4kW Power Entry
Module
N/A
Description
"MX240 DC Power Supply
Description" on page 55
"MX240 Power System
Description" on page 46
37