CCNA + RJ45/HUB Pins

[ElijahBaley]

I do not understand the pin confuguration of hubs, it seems to me that most devices are in either a "a" or "b" configuration, that is to say that you can connect a Server NIC "a" to a Switch "B" with a plain old straight through piece of CAT5 but if you want to connect two "a" devices together (two worksations) you use a crossover cable.

How is it then that a hub port can be connected to another hub port with a straight through cable?

Thanks for your help,

G
"r tape loading error"

 

[tcvander]

Some Ethernet network devices (10/100BaseT hubs) have what is referred to as a MIDI port. This type of port allows the device to be connected to an Ethernet port on a switch using a straight-through patch cable by activating an internal cross-over function. This is typically done by turning the MIDI switch on. When the MIDI switch is in the out position the port is expecting to be connected to an end-user device.

 

[ElijahBaley]

So all the ports on the hub can change state by using the MIDI switch?

Thanks for your help,

 

[ChrisAC]

No, only the MIDI port! This is usually used to provide an uplink to another hub/switch using a straight through cable.

Chris

************************
Chris Andrew, CCNA
chris@iproute.co.uk
************************

 

[tcvander]

Ditto!!

 

[ecafracs]

in a crossover cable, the transmit pairs are connected to the receive pairs, thus enabling data transmission/exchange.
hubs can be connected to another hub using a straight through cable but the MIDI button has to be pressed.

 

[ElijahBaley]

Thanks for your help,