[SI-LIST] Re: Tip & Ring Signals -Reg

Suresh,

The big issue is safety.  You need to start with your clearance 
requirements for safety.  Assuming that they are adequate, your next 
concern would be unbalanced coupling.  At 1Mhz and below a thin sheet of 
copper do not shield effectively.


Steve.

At 10:36 AM 12/23/2004 +0000, RamachandranSuresh Kumar wrote:
>
>
>Hi steve,
>Thankyou, here if I provide  Earth ,whether Capacitive loading of the 
>tip&ring plays role ? also  how I can  make a trade off between 
>the  crosstalk shielding  and capacitive loading.
>
>Whether Capacitive loading actually reduce the bit rate ?
>
>
>With Regards,
>Suresh Kumar.R
>
>
>
>
>On Wed, 22 Dec 2004 steve weir wrote :
> >Suresh, your primary concern with tip and ring should be meeting the 
> safety standards.  Earth can provide some crosstalk shielding, but at the 
> low frequencies of DSL you are primarily talking about shielding from 
> other nearby RF sources.
> >
> >Steve
> >At 05:14 AM 12/22/2004 +0000, RamachandranSuresh Kumar wrote:
> >>
> >>Hi all,
> >>I am a new user.
> >>
> >>This is the 12 layer ADSL  line card and regarding giving
> >>earth shield pouring.
> >>
> >>I am routing  24 differential pairs of tip@ring signals from the 
> transformer to the  CPCI Connector in the layout.
> >>I would like to know
> >>
> >>1. How if Earth Shield is poured in between the  tip@ring signal
> >>    routing plays the role.
> >>
> >>Whether earth shield helps in any way to this differential signal.
> >>
> >>The shield is shorted in the backplane with the ground,and kept 
> sperately in the line card.
> >>
> >>Expecting your reply
> >>
> >>With Regard,
> >>Suresh Kumar.R
> >>
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