Mx240 Host Subsystem Description; Mx240 Host Subsystem Leds; Mx240 Midplane Description - Juniper MX240 Hardware Manual

MX240 5G Universal Routing Platform Hardware Guide

MX240 Host Subsystem Description

See Also

MX240 Host Subsystem LEDs

MX240 Midplane Description

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The host subsystem provides the routing and system management functions of the
router. You can install one or two host subsystems on the router. Each host subsystem
functions as a unit; the Routing Engine must be installed directly into the Switch Control
Board.
NOTE: We recommend that you install two host subsystems for redundant
protection. If you install only one host subsystem, we recommend that you
install it in slot
0
Each host subsystem has three LEDs that display its status. The host subsystem LEDs
are located in the middle of the craft interface.
MX240 Component LEDs on the Craft Interface on page 36
Maintaining the MX240 Host Subsystem on page 227
Taking an MX240 Host Subsystem Offline
Each host subsystem has three LEDs that display its status. The host subsystem LEDs
are located in the middle of the craft interface. For more information, see
Component LEDs on the Craft Interface" on page
The midplane is located toward the rear of the chassis and forms the rear of the card
cage (see Figure 21 on page
the front of the chassis, and the power supplies install into the midplane from the rear
of the chassis. The cooling system components also connect to the midplane.
The midplane performs the following major functions:
Data path—Data packets are transferred across the midplane between the line cards
through the fabric ASICs on the SCBs.
Power distribution—The router power supplies connect to the midplane, which
distributes power to all the router components.
Signal path—The midplane provides the signal path to the line cards, SCBs, Routing
Engines, and other system components for monitoring and control of the system.
.
36.
59). The line cards and SCBs install into the midplane from
"MX240
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