RE: Static Discharge - An issue to be added to the technical issues list
Hi all,
I am looking for more information regarding the issue of charges accumulated
on cable.
As I remember Roger has pointed that he measured 750V due to this phenomena.
The information that I need is the following:
1. What will considered to be acceptable circuit model that we can use to
analyze worst case conditions?
1.1 Can we assume that the worst case situation is applying charged
capacitor of TBD nF with TBD voltage and connect it through TBD impedance
between the feeding port and between the feeding port and system
ground?
2. Is it applies only to cables from CAT 5E and up?
Thanks
Yair.
Darshan Yair
Chief R&D Engineer
> PowerDsine Ltd. - Powering Converged Networks
> 1 Hanagar St., P.O. Box 7220
> Neve Ne'eman Industrial Zone
> Hod Hasharon 45421, Israel
Tel: +972-9-775-5100, Cell: +972-54-893019
Fax: +972-9-775-5111
> E-mail: <mailto:yaird@xxxxxxxxxxxxxx>.
> http://www.powerdsine.com
>
>
>
>
> -----Original Message-----
> From: RDLove [SMTP:rdlove@xxxxxxxxx]
> Sent: ו, ספטמבר 15, 2000 7:46 PM
> To: Dieter Knollman; stds-802-3-pwrviamdi@xxxxxxxx
> Subject: Re: Static Discharge - An issue to be added to the technical
> issues list
>
>
> Dieter, thank you for the input. I will record the following as the first
> additional technical issue to be added to our issues list:
>
> Decide if there is a need to specify a discharge path for the
> portential
> on the cable. If the answer is yes, decide if it should be part of the
> requirements or an informative annex. Then complete the work for
> incorporating the information in the draft.
>
> Best regards,
>
> Robert D. Love
> President, LAN Connect Consultants
> 7105 Leveret Circl
> Raleigh, NC 27615
> Phone: 919 848-6773
> Fax: 720 222-0900
> email: rdlove@xxxxxxxx
> ----- Original Message -----
> From: Dieter Knollman <djhk@xxxxxxxxxx>
> To: <stds-802-3-pwrviamdi@xxxxxxxx>
> Sent: Friday, September 15, 2000 12:53 PM
> Subject: Static Discharge
>
>
> >
> > Hi,
> >
> > My background is telephony. I'm totally new to 802.3, so please excuse
> > my ignorance.
> > One thing that appears strange is the lack of an intentional discharge
> > path for the potential on the cable.
> > The only means that I have found is breakdown of the common mode
> > termination capacitors.
> > Are these caps with 2 kV rating intended to be leaky?
> >
> > On POTS line interfaces the Tip lead is typically biased around ground
> > and serves as a discharge path to earth ground for Analog Sets. Do the
> > IP Phones require a discharge path via the LAN?
> >
> > Dieter Knollman
> > DMTS
> > Lucent
> > djhk@xxxxxxxxxx
> >
>