So..... Another validation of my use of shielded cable with the static drain wire and shielded RJ45 connectors? Hmmmmmmmmmmmmm......
And still no radios lost from ESD or surge. Go figure. From: [email protected] [mailto:[email protected]] On Behalf Of Scott Carullo Sent: Thursday, August 26, 2010 9:26 PM To: [email protected] Subject: [WISPA] Plastic jacket is the major cause of ESD damage... Mike Ford says in this post: http://ubnt.com/forum/showthread.php?t=22612 <http://ubnt.com/forum/showthread.php?t=22612&page=3> &page=3 =========== Hello, Using STP with AirGrid/NB give buildup of ESD along the Ethernet cables plastic jacket a place to go other then the radio. The Ethernet cables plastic jacket is the major cause of damage to our devices if they are not grounded at the base of the tower or have no provisions for ground. Once the charge on the outside of that jacket passed 25-30kV it has enough potential to ark OVER the top of the plastic RJ45 connector and onto the Ethernet pins of the Ethernet lines. If you have a grounded cable, that is properly grounded at the base of the tower, this will provide the path of least resistance for the ESD buildup on the Ethernet cabling. The whole goal is to prevent the static from ARcing to the Ethernet lines damaging the devices. =========== I always thought the ESD was picked up and transferred through the metal components on a cable. I never considered the plastic jacket the source or transmission medium for a high-voltage static discharge. This would seem to indicate if you lose the jacket and had a naked cable that you would eliminate the ESD problem - but somehow I don't buy that either. Those of you electrical gurus please enlighten me. Either something isn't right (or needs further explanation) or I just learned something I never knew... maybe both :) Thanks Scott Carullo Brevard Wireless 321-205-1100 x102 <http://www.brevardwireless.com/files/email.gif>
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