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 Posted: Sat Oct 22, 2005 7:00 pm Post subject: Help - connecting a laptop to a PC |
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I have a laptop using a USB to ethernet adapter. I have a
10/100 ethernet card in an IBM desktop PC. Both running XP.
Can I connect these directly using a cat 5 cable or do I need a hub or a switch in between? Ive tried to just connect them both together but it does not work ?
Thanks |
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| Posted: Tue Oct 25, 2005 10:57 am Post subject: |
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| You need whats called a cross over cable - you can't just directly plug in a cat 5 cable between to NIC's |
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| Posted: Wed Oct 26, 2005 5:31 pm Post subject: |
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| Certman wrote: | | You need whats called a cross over cable - you can't just directly plug in a cat 5 cable between to NIC's |
What's the difference between a cat 5 cable and a crossover cable? |
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| Posted: Thu Oct 27, 2005 1:59 am Post subject: |
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| Newbie wrote: | | Certman wrote: | | You need whats called a cross over cable - you can't just directly plug in a cat 5 cable between to NIC's |
What's the difference between a cat 5 cable and a crossover cable? |
Perhaps this will help you a bit ? 
10BASE-T and 100BASE-TX use one pair for transmission in each direction. The Tx+ line from each device connects to the tip conductor and the Tx- line is connected to the ring. This requires that the transmit pair of each device be connected to the receive pair of the device on the other end. When a terminal device is connected to a switch or hub, this crossover is done internally in the latter. A standard straight through cable is used for this purpose where each pin of the connector on one end is connected to the corresponding pin on the other connector. Because the connector pin pairings are the same in TIA-568A and TIA-568B, any given cable may be wired to either standard and it will work; the choice between TIA-568A and TIA-568B is arbitrary.
One terminal device may be connected directly to another without the use of a switch or hub, but in that case the crossover must be done externally in the cable. Since 10BASE-T and 100BASE-TX use pairs 2 and 3, these two pairs must be swapped in the cable. This is a crossover cable. A crossover cable must also be used to connect two internally crossed devices (e.g., two hubs or switches) as the internal crossovers cancel each other out.
Because the only difference between TIA-568A and TIA-568B are that pairs 2 and 3 are swapped, a crossover cable is just a cable with one connector following TIA-568A and the other TIA-568B. Such a cable will work for 10BASE-T, 100BASE-TX, and 100BASE-T4 (which uses all four pairs).
Many newer Ethernet NICs, switches and hubs automatically apply an internal crossover when necessary. This feature is known by various vendor-specific terms, e.g., Netgear calls it Auto uplink and trade; and other common vendor terms include Auto-MDI/MDI-X, Universal Cable Recognition and Auto Sensing. This eliminates the need for crossover cables, obsoletes the uplink/normal ports and manual selector switches found on many older hubs and switches, and vastly reduces installation errors, especially by non-technical users. |
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Sarah of Certz.com
CCNP
Joined: 09 Dec 2002
Posts: 723
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| Posted: Tue Nov 08, 2005 1:26 am Post subject: |
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It is possible to make your own, offcourse it only costs a few dollars to buy, but could be a good learnign experience to make your own cable.
Many sites out there, perhaps certz.com will make an article as part of our new networking series  |
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