Hi, I've 2 scopes with LAN issue caused by dead Ethernet Controller chip. All this while, the LAN is working fine through USB-LAN adapter until one day I plug the LAN cable directly to the office network port. Since then, the LAN is not function anymore. The Ethernet Controller chip (*HBM ESD +/-5kV*) is protected by a Railclamp chip. The Railclamp datasheet mentions "ESD protection for high-speed data lines to IEC 61000-4-2: (ESD) ±15kV (air), *±8kV (contact)*". 1. From the Ethernet Controller HBM ESD spec of +/-5kV, any voltage more than 5V could kill the chip. In this case, the Railclamp doesn't protect the Ethernet Controller since it clamps at +/-8kV, right? If I understand the spec correctly, Railclamp will not clamp a 6kV and this kills the Ethernet Controller? 2. I read about PoE/PoE+ and understand huge voltage (~54V) exist. How possible is the PoE/PoE+ kills the Ethernet Controller chip? Appreciate your advice & comments. Thanks. -GCE ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu