Interfaces s0/s1 are not coming up on cisco 2500 Router

By imi6969
Apr 16, 2008
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  1. Im trying to to set up cisco routers (2500 series) for CCNA studies but due to some reasons the serial interface s0/s1 are not coming up.

    Before assigning ip address ,clockrate at DCE interface and no shutdown commands the show interface command says the following:
    Serial0 is administratively down, line protocol is down
    Hardware is HD64570......

    And after ip address,clockrate,no shutdown command ,
    show interface reads like
    Serial0 is down, line protocol is down........

    show controller command does not show the type (DTE or DCE) interface.(as it shows in simulator)
    I changed the cables changed the routers (I have four) , reload the routers, even set back every thing to default factory default settings but nothing works.

    One thing I noticed that the led were off on all seria interfaces on all four routers but ethernet leds were flickering.
    Your professional advice/help would be highly appericiated.

    Thanks

    (I managed to configure the routers , completely in the simulator but not with real hardware)
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