UTP Cables

Hi guys, i know what type of a cable to use between equipments, but
what i wanna ask about is:
if we are connecting a PC to a Switch or a Hub we would use a Straight
through cable, i wanna know how does the Switch recieve them on the
Transmit pair because its Straight. Thx.

Andy

Andy wrote:
> if we are connecting a PC to a Switch or a Hub we would use a Straight
> through cable, i wanna know how does the Switch recieve them on the
> Transmit pair because its Straight. Thx.

Hi Andy,

An "Interface" Port (like from the LAN-Card of a PC or from
a NM-FE) usually uses MDI wireing.

Hub/Switch-Ports usually have MDI-X wireing.

That's why you can use straight cables, when connecting an
Interface to a Switch-Port, and that's why you need crossover,
when connecting interfaces to each others.

Some modern Switches have MDI/MDI-X autosensing. (For you this
means, that you can use both types of cables here).

Rainer

Rainer Temme

Pin Name Direction Description
1 TD+ HUB <-- NIC Transmit data +
2 TD- HUB <-- NIC Transmit data -
3 RX+ HUB --> NIC Receive data +
4 nc ---
5 nc ---
6 RX- HUB --> NIC Receive data -
7 nc ---
8 nc ---

Merv

Thx Guys, you have been a great help.

Andy