[Elphel-support] Elphel 353 no connection after RTSP interuption

[support-list]

Oleguer, thanks for the comment.

Yes, there is definitely a limit to what ESD the chip can withstand and some can pass through the transformer, so I put "rather" before "immune".

Andrey 

---- On Wed, 30 Jul 2014 02:05:22 -0700 Oleguer Nogués Correig<oleguer at gmail.com> wrote ---- 

 > Dear all, but particularly to Andrey,
 > 
 > I just would like to comment the fact that just one year ago I saw a very similar failure in one instrument I had designed. This instrument
 >  had an Ethernet interface, too, which was implemented with the Ethernet interface of an Altera FPGA development board (2s60 Nios II devkit). 
 > That board was inside a scientific instrument, custom built, and the instrument was placed during months inside a small house at the
 >  top of a hill, for scientific observation purposes. Seems that the environment on that place was prone to ESD, and one day the instrument
 > just did not respond any more: exactly the same failure as hugo is describing. So to summarize, I wouldn't say that "those chips are rather 
 >  immune to ESD". I would say they are actually sensible at some level, and even though this failure might not be the most frequent,
 >  this failure may appear specially in environments in which ESD are more frequent, or stronger.  
 >  
 > 
 > Kind regards to all,
 > 
 > 
 > Oleguer 
 > 
 > 
 > 
 > 2014-07-29 18:56 GMT+02:00 support-list <support-list at support.elphel.com>:
 >  Hugo, I've never seen such failure before, and such chips are rather immune to ESD, it is also connected through the transformer to the network connector, not directly. And the failure is definitely in the chip itself, not in the connection to the CPU.
 >  
 >  I did not have the replacement chip, now our contract manufacturer is building more boards and are ordering components, we'll try to fix the board
 >  
 >  Andrey
 >  ---- On Tue, 29 Jul 2014 03:19:45 -0700 hugo chauvet  wrote ----
 >  
 >  >Hi Oleg,
 >  >
 >  >
 >  >Do you have any idea why the network chip burnt ? 
 >  >Please let us know when you send back the camera with the new network chip.
 >  >
 >  >
 >  >Regards,
 >  >
 >  >
 >  >Hugo.
 >  >
 >  >
 >  >
 >  >2014-07-21 23:35 GMT+02:00 Oleg <support-list at support.elphel.com>:
 >  > Hi Hugo, 
 >  >
 >  >Sorry, it took me to long to answer.
 >  >Yes, we received the camera. 
 >  > The network chip on the system board doesn't work - burnt. It is possible to replace it.
 >  >
 >  >
 >  >
 >  >Best regards,
 >  >Oleg Dzhimiev
 >  >Electronics Engineer
 >  >phone: +1 801 783 5555 x124
 >  > Elphel, Inc.
 >  >
 >  >
 >  >
 >  >
 >  >
 >  
 > 
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 >  >Support-list at support.elphel.com
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 >  >
 >  
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