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Home > Archive > alt.certification.network-plus > August 2003 > Crossover Conundrum
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Crossover Conundrum
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| Logan W. 2003-08-01, 6:24 pm |
| Pages 136-137, Mike Meyers 2nd N+.
He says, "To spare network techs the trouble of making special crossover
cables, most hubs have a specific crossover port that crosses the wires
inside the hub."
On the next page, he says, "Connecting two crossover ports with a regular
piece of twisted pair cabling is among the most common Ethernet
misconfigurations."
In other words, the first says to use regular cable, and the second says to
use crossover cable. Which is it?
The only thing I figure is that in the second statement, he's talking about
plain old nic cards and not hubs.
Still though, I don't understand how two hubs both can cross the signals
internally. Or does one of them just auto-sense which wires the data is
coming in on? There would have to be a sort of handshaking process for
this.
Thanks,
Logan
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| C. Philip Cutler II 2003-08-01, 8:24 pm |
| Depends on what you are doing, if your switch/hub device has a crossover
port then use a regular cable, if it doesn't have a crossover port you use a
cross over wire.
And yes I have seen instances when there was a crossover port set to
crossover and a cross over cable plugged in, making it a regular cable.
Philip
"Logan W." <rlwebb@SPAMAWAYchartertn.net> wrote in message
news:vilpo8r4r9iu85@corp.supernews.com...
> Pages 136-137, Mike Meyers 2nd N+.
> He says, "To spare network techs the trouble of making special crossover
> cables, most hubs have a specific crossover port that crosses the wires
> inside the hub."
> On the next page, he says, "Connecting two crossover ports with a regular
> piece of twisted pair cabling is among the most common Ethernet
> misconfigurations."
>
> In other words, the first says to use regular cable, and the second says
to
> use crossover cable. Which is it?
>
> The only thing I figure is that in the second statement, he's talking
about
> plain old nic cards and not hubs.
>
> Still though, I don't understand how two hubs both can cross the signals
> internally. Or does one of them just auto-sense which wires the data is
> coming in on? There would have to be a sort of handshaking process for
> this.
>
> Thanks,
> Logan
>
>
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| There is usually a button that you push in that activates the cross link
port, usually the last port, I have a 3com 8 port hub and port 8 is the
cross link port. so I think that he means the if you have 2 hubs and you
activate the crosslink port by pushing both buttons in and you use a
straigt-thru cable to try and connected them together both ends will get
crossed making both ends the same again so now what you have is a regular
cable again.
"Logan W." <rlwebb@SPAMAWAYchartertn.net> wrote in message
news:vilpo8r4r9iu85@corp.supernews.com...
> Pages 136-137, Mike Meyers 2nd N+.
> He says, "To spare network techs the trouble of making special crossover
> cables, most hubs have a specific crossover port that crosses the wires
> inside the hub."
> On the next page, he says, "Connecting two crossover ports with a regular
> piece of twisted pair cabling is among the most common Ethernet
> misconfigurations."
>
> In other words, the first says to use regular cable, and the second says
to
> use crossover cable. Which is it?
>
> The only thing I figure is that in the second statement, he's talking
about
> plain old nic cards and not hubs.
>
> Still though, I don't understand how two hubs both can cross the signals
> internally. Or does one of them just auto-sense which wires the data is
> coming in on? There would have to be a sort of handshaking process for
> this.
>
> Thanks,
> Logan
>
>
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| Logan W. 2003-08-02, 4:25 am |
| > There is usually a button that you push in that activates the cross link
> port, usually the last port, I have a 3com 8 port hub and port 8 is the
> cross link port.
Yes, I believe I have it now. I was thinking that you are supposed to
connect the crossover ports to each other, but actually you are supposed to
connect a crossover port to a regular port.
Although, I suppose you COULD connect two hubs with changeable ports like
that with both set to crossover. You would just have to use a crossover
cable. heheheheheh
If they have any questions like that on the test, I'll keel over.
Logan
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| Paul Devlin 2003-08-14, 1:25 am |
| here is the answer to your question:
You should only use the crossover port on one hub/switch/whatever.
(otherwise your are doing a cross-crossover, which is a sort of double
negative).
Paul Devlin
A+ Net+
On Fri, 1 Aug 2003 18:19:22 -0400, "Logan W."
<rlwebb@SPAMAWAYchartertn.net> wrote:
>Pages 136-137, Mike Meyers 2nd N+.
>He says, "To spare network techs the trouble of making special crossover
>cables, most hubs have a specific crossover port that crosses the wires
>inside the hub."
>On the next page, he says, "Connecting two crossover ports with a regular
>piece of twisted pair cabling is among the most common Ethernet
>misconfigurations."
>
>In other words, the first says to use regular cable, and the second says to
>use crossover cable. Which is it?
>
>The only thing I figure is that in the second statement, he's talking about
>plain old nic cards and not hubs.
>
>Still though, I don't understand how two hubs both can cross the signals
>internally. Or does one of them just auto-sense which wires the data is
>coming in on? There would have to be a sort of handshaking process for
>this.
>
>Thanks,
>Logan
>
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| Barry OGrady 2003-08-30, 11:27 am |
| On Fri, 1 Aug 2003 18:19:22 -0400, "Logan W." <rlwebb@SPAMAWAYchartertn.net> wrote:
>Pages 136-137, Mike Meyers 2nd N+.
>He says, "To spare network techs the trouble of making special crossover
>cables, most hubs have a specific crossover port that crosses the wires
>inside the hub."
>On the next page, he says, "Connecting two crossover ports with a regular
>piece of twisted pair cabling is among the most common Ethernet
>misconfigurations."
>
>In other words, the first says to use regular cable, and the second says to
>use crossover cable. Which is it?
>
>The only thing I figure is that in the second statement, he's talking about
>plain old nic cards and not hubs.
>
>Still though, I don't understand how two hubs both can cross the signals
>internally. Or does one of them just auto-sense which wires the data is
>coming in on? There would have to be a sort of handshaking process for
>this.
Connecting two hubs or switches together is done by simply connecting
any one port of one to any one port of the other. That would need a
cross over cable unless one of the ports is crossed over. The crossed
port can be used with a computer if a crossover cable is used. Some
hubs have one port that is only crossed while some have two
connectors for one of the ports.
>Thanks,
>Logan
-Barry
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