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  1. Junior Member
    Join Date
    Oct 2008
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    6

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    CCNA
    #1

    Default Query about cross-over and straight-through cable.

    >>Hi Guys i have a query about Straight -through and Cross-over cable.
    >>Why do we use ,
    1.straight- through cable between Hub and Host .
    2.Cross-over cable between switch and HUB.
    3. Again Straight cable between Router and Switch.
    If it is because HUB don't break collission domains but switches and Routers do.SO why do we still user cross-over cable between Switch and switch. I have lot of confusions- Could any body please clear it for me.
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  3. Senior Member
    Join Date
    Oct 2005
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    1,030

    Certifications
    CCNP (R&S/Voice), CCDP, CCIP, VCP, NCDA, MCSE, CCNA Security
    #2
    You use cross-over cables between like devices.

    Technically it's because off the way the ports are physically designed. In order for communication to work the transmit port needs to be connected to the receive port of the device it's connecting to, and vice versa. So, routers and PCs have the same port wiring, as do switches and hubs. The only thing that makes the two groups different is that their transmit and receive contacts are switched.

    I hope that makes sense.

    -Kale
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  4. Senior Member auos's Avatar
    Join Date
    May 2008
    Location
    IQ
    Posts
    185

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    2xCCIE (RnS, SP)/CCENT/CCNA(R&S/Voice/Security) CCNP/CCIP/CCVP
    #3
    Hi,

    It is very simple just like this:-

    Group 1 (Devices That Transmit on 1,2 PIN and Receive on 3,6 PIN)
    -PC NIC
    -Router
    -AP
    -Network Printer


    Group 2 (Devices That Transmit on 3,6 PIN and Receive on 1,2 PIN)
    -Hubs
    -Switches

    Each devices in same group must use cross-over cable.
    Each devices in different group must use Straight-Through cable.

    Because you can see the cross-over cable reverses the PIN for Transmit and Receive.


    BR,
    Auos
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