Cross-over Cable >> Problem

[MOTARO]

Hi
I made a Cross-over cable with > 20 meter Length between 2 Computer
but network does not work ( DOS or WINDOWS ) I test the network with
PING - IPCONFIG > but nothing .... : (
but when i use a cable with > 1 meter length network work fine
( DOS or WINDOWS )

Cable type : Micronet UTP Cat.5E - SP1101E 24AWG - TIA/EIA-568-B.2
405183 M
Connector : RJ45
Speed : 100 Mbps

NIC : Computer 1 Onboard and Computer 2 PCI >> Realtek
RTL8139 10/100


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DOS - WINDOWS 2000 Pro - WINDOWS 2003

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Thanks

Best Regards,

FARSHAD DASHTI

 

[Sue]

Did you test the 20 meter length cable itself. I've got
about that length on my home network, and works ok. Also
could check the NIC cards on the two computers.
Good luck

 

[Jupiter Jones [MVP]]

The cable is probably defective.
If the network works with 1 meter, it should easily work with 20 feet.

 

[Ron Lowe]

Hi
I made a Cross-over cable with > 20 meter Length between 2 Computer
but network does not work ( DOS or WINDOWS ) I test the network with
PING - IPCONFIG > but nothing .... : (
but when i use a cable with > 1 meter length network work fine
( DOS or WINDOWS )

Cable type : Micronet UTP Cat.5E - SP1101E 24AWG - TIA/EIA-568-B.2
405183 M
Connector : RJ45
Speed : 100 Mbps

NIC : Computer 1 Onboard and Computer 2 PCI >> Realtek
RTL8139 10/100


===
DOS - WINDOWS 2000 Pro - WINDOWS 2003

===
Thanks

Best Regards,

FARSHAD DASHTI

I'm 99.99999% certain you have wired the cable wrong.

An incorrectly wired cable may work OK at 10Mbit,
and for short lengths at 100Mbit, but will fail totally on longer lengths.

The correct twisted pairs are not being observed.

It's not enough just to connect 1-1, 2-2, 3-3 and 6-6.
You need to look at the twisted pairs inside the cable.

The most common error is to use use one pair for pins 1&2,
another pair for pins 3&4, another pair for pins 5&6, and a pair for 7&8.
The wires sit neatly inside the connectors if you do it this way.

Unfortunately, this will not work.
( Well, sometimes on a short run it will, but probably not at 100 )

pins 1&2 need to be a pair.
pins 3&6 need to be a pair.

This causes the wires to cross over each other inside the plugs, and it
seems a bit ugly. But this is the ONLY way it will work. Look at the
pictures at the bottom of this page:

How to Wire a Network
http://www.linksys.com/faqs/default.asp?fqid=20

 

[MOTARO]

Hi

So thanks

My network worked gooooooood
I wired the cable again >>

1-3 2-6 4-7 5-8

and it worked good


//
Thank you very much



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Feri