原帖由： Walter Galan ,
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 [link|http://www.google.com/products/catalog?q=linkrunner+fluke&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&ie=UTF-8&cid=689722596399937283&ei=CpkES-mEBo-4swPlmJXMCA&sa=X&oi=product_catalog_result&ct=result&resnum=4&ved=0CCMQ8wIwAw#ps-sellers|Fluke LinkRunner]. Keep in mind this is a professional model, but there should be similar devices available.