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网络设备包括路由器,调制解调器,和共享存储器的维修信息。

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Tool to plug in to an ethernet jack to sense whether it is active

I don't know what to call this, and have thus far had no luck googling an answer. Ideally, I'd have a small meter that would plug in to a female RJ45 wall jack. It would give me a green light (or whatever) to indicate that there was an active network available.

There must be a tool that does this? What's it called and where can I find one?

Thanks.

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if you are just looking for "hot" ports, where a router or switch is already in place, you just need something like this:

http://www.frys.com/product/3824317?site...

We use a spare IP phone where I work...

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Perfect. This is just what I needed. Thanks.

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Does anyone know if anything smaller exists? I remember a long time ago when I worked at a big networking center one of the technicians had a thumb-sized terminator on his keychain he'd just plug into ports to see if they're active. I'm looking for something similar.

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What you're looking for is a Network Testing Device. I'm not sure what the price for such a device is, but I can guarantee you that it does the job. The tool that I've used in the past is a Fluke LinkRunner. Keep in mind this is a professional model, but there should be similar devices available.

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Thanks, that would do it. I need something simpler. Might use this in the future, though.

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Something like this http://is.gd/4Yvek is probably a little more cost effective if it is just for hobby purposes - A Laptop would also suffice ;)

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This is good too. The laptop option is what I've been doing, but wanted something simpler. Thanks for the advice.

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Bruce and David,

Hey, does that device have a mac address? or does it grab a dhcp address if available?

Ken

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This must be the oldest question that was reawakened. It is 4 years old and Bruce and David have not been active in a while. You might want to try to ask your question right here

http://www.ifixit.com/Answers/Ask/Networ... :-))

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I'm still here but haven't asked or answered anything! I just use a laptop to see if there's a connection.

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u can use wireshark or Mot tester with sensor for activity

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I use one of these, but it only test 10/100 lines not 1000 Mbps lines.

https://www.amazon.com/Smartronix-Linkch...

Back in the day, I’ve made a few testers out of these as well. Soldered a push button and a battery inside.

https://www.revamp-it.ch/index.php/en/sh...

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