Path: EDN Asia >> Design Ideas >> Communications/Network >> LEDs light LAN-cable tester
Communications/Network Share print

LEDs light LAN-cable tester

01 Mar 2011  | Benabadji Noureddine

Share this page with your friends

Cable and connector faults are relatively common in LANs. You can use the circuit in Figure 1 to test straight- or cross-link 10BaseT, 100BaseT, or gigabit UTP and STP cables. The circuit performs a continuity test for each linked pair. An LED representing each linked pair flashes when the corresponding pair connects properly between the cable's RJ-45 connectors. It can also determine whether the cable is a straight-link or a cross-link type.

Figure 1

IC1, a small, six-pin Microchip PIC10F200 microcontroller, performs the test. On power-up, the four I/O pins act as outputs and are driven high for approximately 0.5 second and then are driven low in the following sequence: GP0, GP1, GP2, and GP3. Once this task finishes, the microcontroller has a dead time for about 4 seconds, after which it loops to the beginning to repeat the procedure.


1 • 2 Next Page Last Page


Want to more of this to be delivered to you for FREE?

Subscribe to EDN Asia alerts and receive the latest design ideas and product news in your inbox.

Got to make sure you're not a robot. Please enter the code displayed on the right.

Time to activate your subscription - it's easy!

We have sent an activate request to your registerd e-email. Simply click on the link to activate your subscription.

We're doing this to protect your privacy and ensure you successfully receive your e-mail alerts.


Add New Comment
Visitor (To avoid code verification, simply login or register with us. It is fast and free!)
*Verify code:
Tech Impact

Regional Roundup
Control this smart glass with the blink of an eye
K-Glass 2 detects users' eye movements to point the cursor to recognise computer icons or objects in the Internet, and uses winks for commands. The researchers call this interface the "i-Mouse."

GlobalFoundries extends grants to Singapore students
ARM, Tencent Games team up to improve mobile gaming


News | Products | Design Features | Regional Roundup | Tech Impact