Re: [SI-LIST] : Cable Shielding: How do you connect the drains?

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From: Farrokh Mottahedin (farrokh@cisco.com)
Date: Mon Apr 02 2001 - 09:52:21 PDT


If terminated only at one end, your shield will provide no magnetic
shielding effect. You can hard wire both ends to the chassis providing
both racks are serviced by the same green wire ground. If both racks are
not serviced by the same green wire ground, you run serious safety risks
due to potential difference in different ground wires.

At 05:46 AM 4/2/01, Stacy_L_Gore@raytheon.com wrote:

>If you are running differential signals between to racks through a
>shielded cable, what should you do with the cable drains?
> * Hard wire both-ends to the chassis?
> * Hard wire one end and let the other float?
> * Float both ends?
> * Connect through a series resistor, or series cap, or series cap and
> resistor in parallel?
> * Is there a rule of thumb or formula based on something to help you
> determine how to connect the shielding?
> * I have seen it done several different ways but never have been real
> sure which way is correct.
>
> * Thanks,
> * Stacy

==============================================
Farrokh Mottahedin, Cisco Systems, Inc.
Gigabit Systems Business Unit GSBU
(408) 525-9185
farrokh@cisco.com

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