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POE hubs

Discussion in 'Networks' started by Boycie, Dec 30, 2005.

  1. Boycie
    Honorary Member

    Boycie Senior Beer Tester

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    Do they function as quickly as their powered equivelants?
    Seem quite handy to have a hub in the middle of nowhere and not have to worry about the mains...
     
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  2. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    There is no reason that they wouldn't IMHO.

    However you need to be carefull about cabling. I have seen some badly made cables that would cause damage with POE, but were OK with just Ethernet.

    Harry.
     
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  3. AJ

    AJ Administrator Administrator

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    We use POE quite a lot with our wireless network, not heard of a switch being POE. After a quick Google found THIS decribing a Gigabyte POE switch :blink

    So I guess it can be as fast as a normal switch.
     
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  4. Boycie
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    Boycie Senior Beer Tester

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    Harry,

    Thanks for the reply. Can you expand a bit on that please. I mean, the hub will get its power from the ethernet cables plugged in.....
     
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  5. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    If it is a standard POE hub/switch then it will take its power from the spare wires in the ethernet cable.

    My warning comes from the fact that as the spares (4,5,7,8 ) are not normaly otherwise used then many cables either have these unwired, or wrongly wired.

    The most worrying I have seen was a 'cross-over' cable where the spares were crossed as well!

    Looking into this further - there seems to be several implementations of this. IEEE 802.3af doesn't use the spare pairs, but you need to be sure of the standards used!

    Harry.
     
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  6. AJ

    AJ Administrator Administrator

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    I think what Harry means is that is the install isn't cabled properly then you stand a damn good chance of perhaps crossing the pairs and causing a short. Imagine the problems that's gonna cause :ohmy

    Edit:Harry is quick on the keyboard and answed before I posted this. Or in otherwords, What He Said :oops:
     
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  7. Boycie
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    Boycie Senior Beer Tester

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    Ah, it is clear now. Thanks :thumbleft
     
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  8. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    I have updated my post - perhaps I should have posted a new item....

    Harry.
     
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  9. Boycie
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    Boycie Senior Beer Tester

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    Thanks for the input Harry. :thumbleft
     
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  10. simongrahamuk
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    simongrahamuk Hmmmmmmm?

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    Some good information in this thread guys! :thumbleft
     
  11. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    I happened to be looking into something else and came across some info that surprised me.

    For 1000Base-T all 4 pairs are used, and a crossover cable for that standard will therefore have the spares crossed as well! Most sites that talked about this pointed out that the standard also includes auto-MDI/MDIX so there should be no need for such a cable.

    Harry.
     
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  12. Boycie
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    Boycie Senior Beer Tester

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    yeah, most hubs are autosensing now aren't they Harry? I mean, it know when to switch the send/receive around..
     
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