Quantcast Crossover cable - still needed?

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  1. #1
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    Default Crossover cable - still needed?

    So I want to connect two GigE network interfaces together to create a small two PC network. I'm not sure if a crossover cable is still required, or if the internal circuits auto-detect when the RX/TX lines should be swapped.

    ???
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  2. #2
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    Default Re: Crossover cable - still needed?

    I think routers generally auto-detect crossover cables, and PC's generally don't. I could very well be wrong, but I remember talk of that a year or two back--perhaps newer PC ethernet jacks are also auto-detecting.

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    fear the MONKEY!!!
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    Default Re: Crossover cable - still needed?

    I don't know if this helps, but I've had mixed success networking to computers with a regular cat5 cable...but it has worked.
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  4. #4
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    Default Re: Crossover cable - still needed?

    If the mfg added the detection in as per spec it should work. Some work some don't, give it a try and let us know.
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  5. #5
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    Default Re: Crossover cable - still needed?

    You would normally need a crossover cable unless;

    Automatic crossover

    Automatic MDI/MDI-X Configuration is specified as an optional feature in the 1000BASE-T standard[1], meaning that straight-through cables will usually work between Gigabit capable interfaces. This feature eliminates the need for crossover cables, obsoletes the uplink/normal ports and manual selector switches found on many older hubs and switches, greatly reducing installation errors. Note that although Automatic MDI/MDI-X is generally implemented, a crossover cable would still be required in the occasional situation that neither of the connected devices has the feature implemented and enabled.

    Even for legacy 10/100 devices, many NICs, switches and hubs automatically apply an internal crossover when necessary. Besides the eventually agreed upon Automatic MDI/MDI-X, this feature may also be referred to by various vendor-specific terms including: Auto uplink and trade, Universal Cable Recognition and Auto Sensing.





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    Default Re: Crossover cable - still needed?

    Alright, I'll try a standard cable tonight.

    Question two: Is Cat5e good for GigE connections?
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    Default Re: Crossover cable - still needed?

    Quote Originally Posted by Greg View Post
    Alright, I'll try a standard cable tonight.

    Question two: Is Cat5e good for GigE connections?
    Absolutely, Cat5e is actually full spec for Giga Ethernet.





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  8. #8
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    Default Re: Crossover cable - still needed?

    Cat5e is fine for gig ethernet. However, on all the switches i set up i use a cross over cable between them. I also like to use a different colored cable (yellow) for cross over, and blue for between patch panels and switches. It looks much nicer that way and is easier to find cables...but i think your just doing it at your house so you probably don't have many devices, or even a patch panel.

    Err edit. i thought you were connecting 2 gig switches together.

  9. #9
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    Default Re: Crossover cable - still needed?

    Nope...just two GigE adapters. I think both are Broadcom ICs, which gave me hope that I didn't need a crossover.

    And it turns out that it looks like I do not need one . Just tried.

    Turns out I'm pretty lucky too...a random Cat5 cable I found allowed the two to auto-negotiate to a 1Gbps link...perfect.
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  10. #10
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    Default Re: Crossover cable - still needed?

    Good for you, enjoy it





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