Re: [uCsimm] HV capacitors on the LAN transformer

From: Daniel Haensse (daniel.haensse@fhk.usz.ch)
Date: Wed Aug 15 2001 - 03:21:13 EDT


Am Mit, 15 Aug 2001 schrieben Sie:
> Folks, who can answer this...
>
> There is a LAN transformer on the ucsimm (VALOR- PULSE
> ENGINEERING part PT4153S). On most Ethernet designs,
> there are 2 1kV 0.01 capacitors connected to this
> transformer on the ethernet side. On the ucsimm these
> transformer pins are left unconnected. Question: what
> these capacitors normally for, why they are missing
> and is there any penalty for not having them?
Those capacitors will discharge to gnd if the voltage is above 1kV.
So if the LAN transformer can't stand the voltage anymore, on the uCSimm
it will discharge to the uCSimm and may blow the ethernet controller or
anything else that the high voltage enjoys to destroy.

Dani

>
> I will really appreciate somebody answering this
> question...
>
> Regards,
> Dmitry Slepov
>
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-- 
**********************************************************

Daniel Haensse Dipl. Ing. ETH Klinik fuer Neonatologie UniversitaetsSpital Zuerich Frauenklinikstr. 10 8091 Zuerich Switzerland Tel: ++41 / 1 / 255 5342 Fax: ++41 / 1 / 255 4442 email: daniel.haensse@alumni.ethz.ch This message resent by the ucsimm@uclinux.com list server http://www.uClinux.com/



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