WRT160N, auto-negotiation has failed at 100 Mbps, can wall jack be the cause?

Hello

Can someone please help me with may be a simple problem for you, but it starts to drive me crazy. Sorry in advance for the long post.

WRT160N installed in the basement, linking (cable) 3 desktops and 2 laptops (wireless). When connecting by wire, some computers have troubles in autonegotiation speed, always end upward with connection failed. Force the speed of 10 Mbit/s full duplex solves the problem.

Curiously, both computers have no problem to 100 Mbps Full Duplex auto-negotiation (HP nc8430 laptop with 5 years and the Broadcom NetXTreme Gigbyte old IBM ThinkCentre M50 8189-Tower network chip, I do not know the exact network chip, but I think that until the Gigabit). Less than 1 year of office by using a Committee of Asus P5N7A-VM with the integrated Realtek, also Gigabit network chip, still FAILED to negotiate at 100 Mbps. The wall plate has 4 Sockets. The question above is the same regardless of any plug used.

After several attempts, I think I've isolated the cause to the wall outlet. There are about 6 metres of cable (~ 20 ft) between the router and the wall outlet. The computers connect to the wall using a cable of 2 meters (~ 7 ft). Go through the wall outlets, I pulled a 10 meter cable (~ 30 ft) connecting the router directly to the computer, then the computer is not always to 100 Mbps now could connect without any problems. So, this seems to indicate that the wall socket has altered the quality of the signal.

The cables (between the router and the wall) are straight with T568B wiring (http://en.wikipedia.org/wiki/T568A/B#Wiring) the sockets are CAT5 RJ45 Keystone Jack free tool (http://www.amazon.com/CAT5-RJ45-Keystone-Jack-Black/dp/B000BSN7RO)

So here are my questions:

Q1. A wall outlet would cause a loss of significant signal or alteration?

Q2. If the wall outlet is the cause of the loss of signal quality, how is it some computers have no trouble to autonegotiation to 100 Mbps Full Duplex and also when forced to 10 Mbps FD, all network problems disappear?

Q3. And the most important question: can you please provide a solution?

Thank you very much in advance for any help.

Hello

Follow up and FINAL solution to close this thread. The cause was the wall outlet. All sockets are of the type version tool-less Keystone Cat5e. All the exihit speed negotiation issue and can be used at 10 Mbit/s full duplex.

I could borrow a punchdown tool and tried a new plug. This time, I tried Keystone Cat6 jack _WITH_ tool. Can be overkilled my cable is Cat5 only. But I don't want to take any risks because the price difference is negligible between Cat5e and Cat6 decision. The new Jack is working perfectly. The AutoDetect computer easily at 100 Mbit/s/s. The fix is so obvious, as soon as I replace threaded plug by a Jack of tool WITH the speed issue disappeared. I have connect / disconnect several times, even restarted the computer to ensure that the new Jack is working OK

Although I'm not a guru in network cabling. But I'm not computer (using Windows & Linux) and I'm quite a handyman. I can't possibly screw up Assembly of ALL taken without tool, I've had. And the misconfiguration of the network in the operationg system is out of the question. Added to this fact that the new tool WITH jack is much easier to mount and all prectly work on the first attempt. I would say in conclusion that WITHOUT TOOL, CLAMP in Ethernet JACKS are UNSTABLE. At least that's my experience.

It's pretty frustrating, that Jack is the last place I guess as a cause of a wiring problem. I changed to RJ-45 Sockets, wiring maps network and same router. All this has not solved until one day I discovered by chance that the cause was the wall outlet. (New computer loan with Ubuntu, I forgot to reduce the network speed to 10 Mb and directly connected to the switch without going through the wall socket and discovered that the computer can connect immediately to 100 MB).

Hope this might help someone else.

Tags: Linksys Routers

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