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Mouse locks up on 'Auto negotiate' network card bit rate.
GbF Aug-25-01 12:30 PM
Hi, I recently had a network between two computers using crossover cat5 cable and two SMC 10/100 ethernet cards, and everything worked fine until I moved the second computer further away (25 metres) and since then, when logged onto the network they can't see each other and the mouse locks up on the host computer. I started playing with the network settings and found that in the properties section for the network card on the host, by switching from Auto negotiate to 'UTP 10 Mbps Full Duplex' it seems to fix the problem and the computers can see one another and the mouse works fine.
My question is why would this be the case ? I was of the impression that you could safely run 100 metres of cat5 without problems. Also when the two computers were next to each other I tested the cable (coiled up) to see if it worked and there didn't seem to be any probs.
Boy this is getting rather long winded...anyway I haven't changed anything except unravelled the lead and run it under the house (checked for possible cable interferance but didn't see anything)
If you have any possible explanation for this (slower bit rate) thanks.


1. RE: Mouse locks up on 'Auto negotiate' network card bit rate.
lbyard Aug-25-01 09:17 PM
In response to message 0

The mouse “locking-up” may or may not indicate an interrupt conflict with a network adapter, which could slow-down the network. Or the lack of mouse responsiveness could occur because the system is busy. What kind of mouse is it: PS/2 or serial? Larry

Q. Why would 100BASE-TX network adapters only operate at 10 MHz when two computers are connected with a long cable?

A. This can be caused by a defective cable, the wrong kind of cable, a cable that is improperly installed, the wrong kind of RJ-45 plugs, cables that are not wired properly, a bad crimp, or defective network adapters. It can also happen with poorly made or improper cables of any length.
The cable should be solid core and rated CAT 5 or higher (jacks and short lengths of stranded cable can be used at either of both ends of the cable--see reference at the bottom of this page).
The cable should be installed following the rules at http://duxcw.com/digest/Howto/network/cable/cable9.htm.
The RJ-45 plugs should be rated CAT-5 or higher and designed for solid core wire (there are RJ-45 plugs for stranded wire).
The cables should be wired according to http://duxcw.com/digest/Howto/network/cable/cable6.htm. The important thing is that the Ethernet transmitters be connected to the Receivers with wires for the SAME twisted pair. If they are not you may see the symptoms you describe, especially with longer cables.
Bad crimp: see All About Crimping at http://duxcw.com/digest/Howto/network/cable/cable8.htm.
Run diagnostics and C:\>net /diag on the adapters.
Also see:
What are the maximum and minimum cable lengths allowed for a 100BASE-TX unshielded, twisted-pair (UTP) Ethernet? at http://duxcw.com/faq/network/cablng.htm.
Does the order of the colors of the wires in a straight-thru twisted-pair network cable matter as long as both ends are the cable are wired the same? at http://duxcw.com/faq/network/ends.htm.
Why would the Link (or LNK) LEDs be on solid, if there is a faulty cable connecting two Ethernet devices? at http://duxcw.com/faq/network/link.htm.

2. RE: Mouse locks up on 'Auto negotiate' network card bit rate.
GbF Aug-26-01 02:42 PM
In response to message 1
Hi lbyard,
Thanks for the information. The mouse is PS2, and I also notice the computer is slow with just about everything else as well (distorted sound etc). If the host computer is trying to find the other and can't, would this preoccupy it to the detrement of all else ?
Also the cable is of unknown quality as I bought it at an auction where the guy said he would connect the RJ45 plugs himself dependant on how I wanted it. Guess I might have been dudded.
So there is no significant disadvantage of having 25 metres, so long as the wiring and positioning of the cable is correct ?

4. RE: Mouse locks up on 'Auto negotiate' network card bit rate.
lbyard Aug-26-01 06:39 PM
In response to message 2
There is no since doing anything else until you have a known-good cable. Auctions, computer
fairs... #@$%^&* Larry

5. RE: Mouse locks up on 'Auto negotiate' network card bit rate.
GbF Aug-27-01 02:45 PM
In response to message 2
Alright, thanks lbyard. I guess I'll go buy the crimpers and try reconnecting the ends and if that fails go buy another cable.
It was just the price of crimpers that was detering me from making one up myself. ##### it.

6. RE: Mouse locks up on 'Auto negotiate' network card bit rate.
abNORMal Aug-29-01 03:15 PM
In response to message 5
You mentioned that "everything else" seemed to have slowed down, as well. Maybe you've jarred something loose in the machine you moved, like the NIC, CPU or one of the expansion slot cards.
Check them all.

7. RE: Mouse locks up on 'Auto negotiate' network card bit rate.
GbF Aug-29-01 08:07 PM
In response to message 5
I'll look into that as well abNORMal. Thanks.

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