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Thread: Hubs and ethernet speeds

  1. #1
    Will Honea NNTP User

    Default Hubs and ethernet speeds

    I just replaced an old D-Link 10mb hub with a newer Linsys 100mb hub and I
    have a couple of questions just out of curiosity:

    Will all the 100mb capable machines connected to the hub re-negotiate and
    speed up when power is applied to the hub or do the individual machines
    need to be re-booted?

    I know that older hubs all negotiated down to the lowest speed - is that
    still generally true? I have a couple of connected stations with 10mb
    adapters still.

    All academic - the D-Link failed and the Linksys was what I had that worked
    so what I get I get but I'm curious.

    --
    Will Honea

  2. #2
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    Default Re: Hubs and ethernet speeds

    Autonegotiation should happen automatically, on power-up or plugin. It should negotiate to the highest speed supported by both parties. That's should, but of course sometimes things go wrong. As long as it works, you're fine. BTW, it would be a switch, not a hub. A hub can have only one packet going through at a given time.

  3. #3
    Will Honea NNTP User

    Default Re: Hubs and ethernet speeds

    ken yap wrote:

    >
    > Autonegotiation should happen automatically, on power-up or plugin. It
    > should negotiate to the highest speed supported by both parties. That's
    > should, but of course sometimes things go wrong. As long as it works,
    > you're fine. BTW, it would be a switch, not a hub. A hub can have only
    > one packet going through at a given time.


    Switch/hub/router - I have generally treated these components as black box
    functions. Being a shut-in for a few days I got sidetracked and started
    looking at the hardware design of all theses. Sure makes that $39.95 "blue
    box" look like a bargain! We both agree - I put signals in, they go out to
    where I want and I get replies back - mission accomplished so get on with
    things.

    --
    Will Honea

  4. #4
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    Default Re: Hubs and ethernet speeds

    Confusing a hub and a switch is mostly harmless, but confusing them with a router is likely to hinder one's understanding of networking. They work at different levels of the network stack.

  5. #5
    Will Honea NNTP User

    Default Re: Hubs and ethernet speeds

    ken yap wrote:

    >
    > Confusing a hub and a switch is mostly harmless, but confusing them with
    > a router is likely to hinder one's understanding of networking. They
    > work at different levels of the network stack.


    Sloppy wording - attention to detail is inversely proportional to age.
    Thanks for the comments. Just as a test, I checked a large file transfer
    with and without the 10mb connections. Made a small but measurable
    difference so overhead is likely eating more throughput than hardware. I
    found several tx905 cards in the junk box so the issue is moot. Being a
    packrat has it's advantages ;-)

    --
    Will Honea

  6. #6
    PV NNTP User

    Default Re: Hubs and ethernet speeds

    On Fri September 11 2009 11:54 pm, Will Honea wrote:

    <snip>
    >
    > Sloppy wording - attention to detail is inversely proportional to age.

    <snip>
    Honea;
    Can you prove this! I provide a counter example.
    --
    P. V.
    "We're all in this together, I'm pulling for you." Red Green

  7. #7
    Will Honea NNTP User

    Default Re: Hubs and ethernet speeds

    PV wrote:

    > On Fri September 11 2009 11:54 pm, Will Honea wrote:
    >
    > <snip>
    >>
    >> Sloppy wording - attention to detail is inversely proportional to age.

    > <snip>
    > Honea;
    > Can you prove this! I provide a counter example.


    Only anecdotally. I just spent several days with a group of my AF Academy
    classmates and it was easy to see the lack of attention to detail in the
    war stories that abounded - we all flew exciting, perfectly executed
    missions and never dropped a bomb off-target. After 50 years of these
    gatherings this disregard for details is quite obvious ;-)

    --
    Will Honea

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