Juniper CBL-M40-PWR-AU ユーザーズマニュアル
Field-Replaceable Units (FRUs)
M40 Internet Router Hardware Guide
4
Field-Replaceable Units (FRUs)
Field-replaceable units (FRUs) are router components that can be replaced at the customer
site. Replacing FRUs requires minimal router downtime. There are three types of FRUs:
site. Replacing FRUs requires minimal router downtime. There are three types of FRUs:
Hot-removable and hot-insertable FRUs—You can remove and replace these
components without powering down the router or disrupting the routing functions.
Hot-pluggable FRUs—You can remove and replace these components without powering
down the router, but the routing functions of the system are interrupted when the
component is removed.
component is removed.
FRUs that require powering down the router—You must power down the router before
removing these components.
Table 2 lists the FRUs for the M40 router.
Table 2: Field-Replaceable Units
For FRU replacement instructions, see “Hardware Maintenance and Replacement
Procedures” on page 131.
Procedures” on page 131.
Component Redundancy
The router is designed so that no single point of failure can cause the entire system to fail.
The following hardware components contribute to system redundancy:
The following hardware components contribute to system redundancy:
Cooling system—When the temperature inside the router is below the acceptable
maximum, the cooling system’s components function at less than full speed. If the
temperature becomes excessive—for example, because a cooling system component is
removed—the SCB automatically increases the speed of the remaining components to
reduce the temperature. The cooling system can function at the higher speed
indefinitely. For more information, see “Cooling System” on page 23.
temperature becomes excessive—for example, because a cooling system component is
removed—the SCB automatically increases the speed of the remaining components to
reduce the temperature. The cooling system can function at the higher speed
indefinitely. For more information, see “Cooling System” on page 23.
Power supply—The router has two load-sharing power supplies to distribute power to the
other components. If one power supply fails, the second power supply can provide full
power to the router's components indefinitely. For more information, see “Power
Supplies” on page 20.
power to the router's components indefinitely. For more information, see “Power
Supplies” on page 20.
Hot-Removable and
Hot-Insertable FRUs
Hot-Insertable FRUs
Hot-Pluggable FRUs
FRUs That Require Powering
Down the Router
Down the Router
Fan tray assembly
Flexible PIC Concentrator
(FPC)
Front and rear impeller
assemblies
Physical Interface Card
(PIC)
Power supply
Routing Engine
System Control Board
(SCB)
Craft interface