Cat5E for Voice

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	Question by David Takanashi posted 16 Oct 2002
	Cat5E for Voice
Hello, I have installed CAT5E for data/voice network. I teminated the RJ45 jacks following the 568B color schema. I terminated the data to a patch panel which works fine. I then terminated the voice cables to a 66 block using the following colors, blue/blue-white, orange/orange-white, green/green-white/ and brown/brown-white down the block. I am using an Intertell digital system. My problem is when a user accidentally plugs a data cable in the telephone jack on the wall it blows a fuse. Do you have any idea why it is blowing fuses and what are your recommendations? Thanks, David
	Answer by Dmitri Abaimov posted 16 Oct 2002
Dear David, This is because Ethernet uses pairs #2 and #3, in some NIC cards unused pairs #1 and #4 are shortened and connected to the ground. Intertel system, on the other hand, uses either just #1 or #1 and #2 with #1 used for power. Then you connect power to the ground, the fuse can't stand it. I would recommend to label jacks clearly, preferrably with colored plastic icons so that it's easy to tell a phone one from a data one. Sincerely, Dmitri Abaimov, RCDD
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