"Cypress Industries introduces a new proprietary LED Cat5E Patch Cable that is guaranteed to drastically increase the speed of your upgrades, installations, troubleshooting, and routine adds/drops while decreasing your most valued expenditures — TIME & MONEY.
Each custom molded strain relief includes a bright LED (light emitting diode) that illuminates each end of this revolutionary patch cable. Simply insert the easy-to-use battery unit in either end of the cable and quickly find the other end. The same battery unit can be used to light up every cable in your network, without which identification is difficult and time-consuming."
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Original URL, circa 2007: http://www.cypressindustries.com/products/ledcable.html