Ethernet link tester

Ethernet link tester
This how-to makes a handy tester that lets you quickly identify if your connection or Ethernet cable that you just made is going to link-up with your network.
If you work in a corporate IT environment you know there are generally more network ports in the building than there are ports on your switches. This means that not all ports are patched in or linked and can be troublesome when setting up a new workstation. Also most managed switches have a feature that allows you to selectively disable ports, so even if the port is patched in it may not be active.
This handy little pocket sized device will allow you to check a port for a link state without having to run down to your wiring closet or having to log into the switch. We use these when prepping server room installs to ensure the networking is good to go when the server may not show up for several weeks or months. (Special thanks to Scott Glick for finding the time to actually make and document one of these)
 
Remove these adsRemove these ads by Signing Up
 

Step 1Gather the goods

Gather the goods
Don't throw those old AUI devices out just yet!
You will need :
1 AUI to 10baseT adapter (I have 2 pictured because different models are slightly different)
a soldering gun or pencil
solder
some solder wick or de-soldering tool (wick works best)
1) 9 volt battery
1) 9 volt battery connector
a small length of 18awg wire
and small momentary on switch. These can be had at your local Radio Shack store
a drill and drill bit sized appropriately to accommodate the switch
« Previous StepDownload PDFView All StepsNext Step »
8 comments
Jan 6, 2011. 12:46 AMnzsammy says:
I built one about a year ago and it has been the most widely used piece of test gear that i have ever owned. other guys i work with have tried to make one, but most just ask me to do it. I wish there was more Instructables like this.
Apr 15, 2010. 2:47 AMtheibm says:
Another fantastic time saving bit of kit for any IT pro! I was thinking of modding an old PCI NIC card and had priced a commercial version of this tester at $280 when I found this Instructable. So I knew I had a couple of AUI's lying in the junk box. $10 for a plastic 'remote control' project box complete with battery holder and a push button switch and it's all go. I am looking into also adding a phone line sensor, perhaps a LED or a small sounder to test for telephone signal on pins 4&5. 
Aug 3, 2009. 6:05 PMiamchrismoran says:
thoughts on doing this with the AUI to 10 base 2? That's what I have... is there a way to get this baby to work for RJ45? (It's a CentreCOM MX10)
Sep 18, 2008. 5:20 PMLurch says:
Excellent, first instructable I've been excited about because I can build it without having to clear the workbench! Now, where might I have put an AUI adapter......
Aug 11, 2008. 9:42 AMmozkowiz says:
I have a better one... where can I get one of those if everyone else threw theirs away
Feb 3, 2008. 7:49 PMtechnodude92 says:
I wonder how many people actually know what an AUI is...
Sep 18, 2007. 8:46 PMabzman2000 says:
Brilliant, and they laughed when I told them I wanted to keep that old adapter, muahahahaha.

Pro

Get More Out of Instructables

Already have an Account?

close

All Steps Viewing
View all steps of an Instructable on the same page when you're a Pro Member.

Upgrade to Pro today!
0
Followers
2
Author:Psyber