01-08-2008 03:45 AM - edited 03-05-2019 08:20 PM
Dear all,
As i know from my ccna study when i connect a Router(DTE) to a computer(DTE) i need to use a cross cable.
In my lab i tryed to do this with straight cable and it also worked.
How can it be? is the router can work either way?
Solved! Go to Solution.
01-08-2008 04:09 AM
The feature is called auto MDI/MDIX.
Which is there by default on some ports actually it is an hardware based application which detects the signaling.
The port auto detect the nature of the cable and make the necessary adjustments in signaling.
regards,
shri :)
01-08-2008 04:00 AM
HI,
Are U sure its a straight cable.
I see, there are no Techical documents justifying the same.
Best Regards,
Guru Prasad R
01-08-2008 04:01 AM
Yes, you are correct
A DTE is a Host computer system and the DTE main DTE signals are
DTR
RTS
TX
RX
DCE signals are
RTS
CTS
CD
TX
RX
Some devices auto sense the signals from the DTE Host and can change their orientation. That is why it works with a straight as well as a rolled cable. However you should always try to use the proper cabling for not all interfaces on all devices are auto-sensing....
01-08-2008 04:09 AM
The feature is called auto MDI/MDIX.
Which is there by default on some ports actually it is an hardware based application which detects the signaling.
The port auto detect the nature of the cable and make the necessary adjustments in signaling.
regards,
shri :)
01-08-2008 05:53 AM
cisco 2960 to 2960 straight - work
pc(winxp) to pc(win2003) straight - work
2600 to 2500 straight - didn't work
pc to 2600 straight - work
pc to 2960 cross - work
What is happening? is the rules of network is changing?
01-10-2008 04:24 AM
Hi Arik,
You can follow another thread in LAN, Switching and Routing, for another prospective:
If we take this question to the physical level, routers, wireless access point Ethernet ports, and PC NICs all send using pins 1 and 2, whereas hubs and switches send using pins 3 and 6. Straight-through cables are used when connecting devices that use the opposite pairs of pins to transmit data (Tx to Rx and Rx to Tx), if the devices are the same (use the same pins for Tx and Rx) then we must use a cross-over cable to cross the transmission.
And as Edison pointed out, before Auto-MDIX, we had to use a crossover cable to connect a switch to a switch, with Auto-MDIX there is only one thing to consider, if speed/duplex are manually configured Auto-MDIX is disabled, and we'll have to use a crossover cable.
NOTE the 2960 does support the auto-MDIX feature and it is enabled by default
BR,
Mohammed Mahmoud.
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