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    M40 Router Components

    Table 1 lists the major M40 router components and characteristics.

    Table 1: M40 Router Major Hardware Components

    Component

    Quantity

    Function

    Redundant

    Field-
    Replaceable

    Offline Button

    Cooling system

    2 impeller trays and 1 fan assembly (3 fans)

    Cools router components

    Yes

    Hot-removable,
    hot-insertable

    Craft interface

    1

    Displays the status and allows you to perform control functions

    Hot-removable,
    hot-insertable

    FPC

    1–8

    Connects PICs to other components and houses shared memory

    Hot-removable,
    hot-insertable

    Yes

    PIC

    1–4 per FPC

    Provides interfaces to various network media

    Hot-removable,
    hot-insertable

    Power supply

    2 AC or 2 DC

    Distributes voltages to components

    Yes

    Hot-removable,
    hot-insertable

    Routing Engine

    1

    Handles routing protocols and maintains routing tables

    Hot-pluggable

    SCB

    1

    Performs router lookups, monitors systems, and transfers control packets

    Hot-pluggable

    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:

    • Hot-removable and hot-insertable—You can remove and replace the component without powering down the router or interrupting the routing functions.
    • Hot-pluggable—You can remove the component without powering down the router, but routing functions are interrupted until the replacement is installed.
    • Requires router shutdown—You must power down the router before removing the component.
     

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    Published: 2012-08-20