[SI-LIST] Dead Ethernet Controller chip suspecting due to high ESD
- From: gcemobile gcemobile <gcemobile@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 11 Aug 2011 22:09:27 +0800
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
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