04-26-2015 03:02 AM - edited 03-07-2019 11:44 PM
Hi,
Please can you tell me if I have got this right.
PC > PC
Cable needed Crossover cable
PCs NIC transmits on Pin 1/2 and receives on 3/6. So you need to use a crossover cable to avoid transmission collisions.
i.e Transmission 1/2 from the PC NIC will be routed to receiving PINS 3/6 at the other end, and vice versa.
PC > Switch
Cable needed standard Straight through cable.
PCs NIC transmits on Pin 1/2 and the PINs on the switch port are reversed so you don't need to use a crossover cable.
i.e The PC transmits on 1/2 and is received by 3/6 at the switch, and the switch also transmits on 1/2 which corresponds to 3/6 at the PC.
Thanks
04-26-2015 07:21 AM
Hi,
Your descriptions are correct. Also, note for PC > Switch scenario, it depends on the switch as some models support MDIX, meaning you can use straight or crossover to connect a PC to a switch. The switch with MDIX capability will correct the pin issue.
http://www.cisco.com/c/en/us/td/docs/wireless/workgroup_bridge/350/installation/guide/350hig/WGBappC.html
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960x/software/15-0_2_EX/int_hw_components/configuration_guide/b_int_152ex_2960-x_cg/b_int_152ex_2960-x_cg_chapter_011.html
HTH
04-26-2015 09:27 AM
Thanks Reza.
I didn't know anything about MDIX, but I do now.
I will just continue to use straight cable for connecting PC>Switches even if the device supports MDIX.
Thanks
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