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    T640 Router Major Hardware Components

    Table 1 lists the major T640 router components and characteristics.

    Table 1: T640 Router Major Hardware Components

    Component

    Quantity

    Function

    Redundant

    Field-
    Replaceable

    Offline Button

    Connector Interface Panel (CIP)

    1

    Provides ports for external management and alarm relay devices

    Hot-pluggable

    Control Board

    1–2

    Monitors and controls router components

    Yes

    Hot-pluggable

    Yes

    Cooling system

    2 front fan trays,
    1 rear fan tray

    Cools router components

    Yes

    hot-removable,
    hot insertable

    Craft interface

    1

    Displays status and provides an interface for controlling router functions

    Hot-removable.
    hot-insertable

    FPC

    1–8

    Connect PICs to other router components, contains Packet Forwarding Engines

    Hot-removable,
    hot-insertable

    Yes

    PIC

    1–4 per FPC

    Provides an interface to various network media

    Hot-removable,
    hot-insertable

    Yes

    Power supply (DC only)

    2

    Distributes needed voltages to router components

    Yes

    Hot-removable,
    hot-insertable

    Routing Engine

    1–2

    Provides routing functions and routing tables

    Yes

    Hot-removable,
    hot-insertable

    Yes

    SONET Clock Generator (SCG)

    1 - 2

    Provides Stratum 3 SONET/SDH clockings

    Yes

    Hot-pluggable

    Yes

    SIB

    5

    Provides switch fabric

    4 active,
    1 standby

    Hot-removable,
    hot-insertable

    Yes

    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