•
In the low-line (110 V) AC power configuration, the MX240 router contains either two
AC power supplies (nonredundant), located horizontally at the rear of the chassis in
slots PEM0 and PEM1 (left to right); or four AC power supplies (redundant), located in
slots PEM0 through PEM3 (left to right). The low-line configuration requires two power
supplies, and the third and fourth power supplies provide redundancy. Each AC power
supply provides power to all components in the router. When two power supplies are
present in a non-redundant system or when four power supplies are present in a
redundant system, they share power almost equally within a fully populated system.
If one power supply in a redundant configuration fails or is removed, the remaining
power supplies assume the entire electrical load without interruption. Two power
supplies provide the maximum configuration with full power for as long as the router
is operational.
•
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
MX240 Chassis Description on page 8•
• MX240 Midplane Description on page 22
MX240 Chassis Description
The router chassis is a rigid sheet metal structure that houses all the other router
components (see Figure 1 on page 8, Figure 2 on page 9, Figure 3 on page 9,
Figure 4 on page 10, and Figure 5 on page 10). The chassis measures 8.71 in. (22.1 cm)
high, 17.45 in. (44.3 cm) wide, and 24.5 in. (62.2 cm) deep (from the front-mounting
brackets to the rear of the chassis). The chassis installs in standard 800-mm deep (or
larger) enclosed cabinets, 19-in. equipment racks, or telco open-frame racks.
Figure 1: Front View of a Fully ConfiguredMX240 Router
Copyright © 2017, Juniper Networks, Inc.8
MX240 3D Universal Edge Router Hardware Guide
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