When to use cross over and straight UTP cables

If you need some help, this should be the first place to look.

Postby MeneM » Thu Jul 25, 2002 1:01 am

<font color='#000000'>Also found <a href="http://menem.mine.nu/cgi/smartfaq/smartfaq.cgi?answer=1027583905&id=1012329006" target="_blank">here</a>.

Crossover vs. Straight Through Cables
(When to use each)
---
Note: NIC = Network Interface Card, HS = Hub/Switch

Use a crossover cable in the following situations:
NIC-to-NIC
NIC-to-HS uplink port
HS uplink-to-HS uplink
HS normal-to-HS normal

Use a straight through cable (normal) in the following situations:
NIC-to-HS normal port
HS uplink-to-HS normal port


Some nicer hubs and switches allow you to choose (via a switch above the port, or possibly through software control) if the uplink port acts like a normal port (like any other on the back of the device) or like an uplink port (RTS/RTR crossed and Send/Recieve crossed).

Crossover cables are not any different from normal cables except that one end has some wires switched so that two devices aren't sending on the same line and listening (to nothing) on the same line.


Many thanks go to bluephile for this tribute</font>
MeneM
 

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