I didn't see the cisco comment and I'm not complaining. I want engineers to
use proper terms when describing such things as are being discussed here.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Sebastian Garcia
Sent: Saturday, January 7, 2017 5:24 PM
To: SI-LIST <si-list@xxxxxxxxxxxxx>
Cc: leeritchey <leeritchey@xxxxxxxxxxxxx>
Subject: [SI-LIST] Re: An Article on what ground is
Hi Lee, don't complain, just a comment/question on the provided Cisco
recommendation. I thought you could have a valuable contribution on that.
Regards,
Sebastian.
PS: A couple of bad formatted messages from you also entered in my mailbox.
leeritchey wrote:
If the discussion is about EMI why do you jeep using the words chassisground,
Sent via the Samsung Galaxy S® 6, an AT&T 4G LTE smartphone--------Original message --------
From: Sebastian Garcia <sg-listas@xxxxxxxxxxxx>circuit's GND to chassis (i.e., local earth).
Date: 01/07/2017 4:21 PM (GMT-08:00)
To: SI-LIST <si-list@xxxxxxxxxxxxx>
Cc: 'Boris Bakshan' <bbakshan@xxxxxxxxx>, 'Lee Ritchey'
<leeritchey@xxxxxxxxxxxxx>
Subject: Re: [SI-LIST] Re: An Article on what ground is Hi Bert, It is
not clear for me this Cisco recommendation of connecting the
Note that in case of inter-building (copper) communication between twoequipment racks, you'll most probably fry boards every time a you have a
Regards,MGX8800
Sebastian.
Bert Simonovich wrote:
As a follow-up to my previous posts in this thread, I came acrossdoument from Cisco on Earthing and Bonding Recommendations for their
this
labeled differently at different points.routers. It is consistant with "grounding" schemes I had worked on,many
and
other telco equipment providers.number of "gnds" there are, but ultimately they are all one node just
Since pictures are worth a thousand words look at Figure C-2 to see
the
GND?http://www.cisco.com/c/en/us/td/docs/switches/wan/mgx/hardware/mgx880s/installation/guide/hig/8850_apC.html
0_serie
Hope this clears confusion,LAMSIM Enterprises Inc.
Bert Simonovich
Signal/Power Integrity Practitioner | Backplane Specialist | Founder
Web Site: http://lamsimenterprises.comexists in a system. Is there any connection between this GND and
Blog: http://blog.lamsimenterprises.com/
________________________________
From: Boris Bakshan [mailto:bbakshan@xxxxxxxxx]
Sent: 7-Jan-17 2:40 PM
To: bertsimonovich@xxxxxxxxxx
Cc: Lee Ritchey; si-list
Subject: Re: [SI-LIST] Re: An Article on what ground is Bert, Sorry,
I'm not following... You previously mentioned that only one GND
Chassis
connectedLee - by "card cage" do you mean the chassis itself?the
On Sat, Jan 7, 2017 at 9:30 PM, Bert Simonovich
<bertsimonovich@xxxxxxxxxx>
wrote:
Boris,
It isn't any different. The actual "Chassis Gnd" of the shelf is
connected to the frame or rack which is connected to the IBN of CBN
of
facility which is effectivly "earth gnd".to
________________________________
From: Boris Bakshan [mailto:bbakshan@xxxxxxxxx]
Sent: 7-Jan-17 2:03 PM
To: bertsimonovich@xxxxxxxxxx
Cc: Lee Ritchey; si-list
Subject: Re: [SI-LIST] Re: An Article on what ground is
Hi Bert, Lee,
This makes completely sense.
However, as with any commercial electronic device that has a
metallic enclosure (VCR, amplifiers, multimedia boxes, etc')
connected
Earth/Safety ground via third contact in a power cord, I would expectthe
same thing with a Shelf/Chassis. Why should this be different ? Forsafety
reasons, why shouldn't the (conductive) body of any chassis be
all ofto
earth ground?
Thanks.
On Sat, Jan 7, 2017 at 8:54 PM, Bert Simonovich
<bertsimonovich@xxxxxxxxxx> wrote:
Boris,
I have done essentially the same thing Lee has described in
case thethe
backplanes I have designed in the past, except that in our
edgeouter
PCB layers on both sides were "GND" plane, and the PCB was
backplaneplated. This
created a faraday shield for all the internal layers. The
withoutwas
metalically connected to the shelf framework with screws
cardsisolation.
There was only one "GND" in the system, including the line
compatibilitythat
plugged into the shelves.
This "grounding" scheme was compatible with single-point
ground/integrated
bonding network (SPG/IBN) and mesh/common bonding
network(Mesh/CBN). Our
systems had to meet GR-1089-CORE - Electromagnetic
isolatedand
electrical safety for network telecommunications equipment.
-48V Battery and Battery return powering the system was
"chassisfrom the
"Chassis GND" with an option to join the battery return to
ground"
at the single power entry point.
Regards,
Bert Simonovich
Signal/Power Integrity Practitioner | Backplane Specialist |
logicFounder<mailto:si-list-bounce@xxxxxxxxxxxxx>
LAMSIM Enterprises Inc.
Web Site: http://lamsimenterprises.com
Blog: http://blog.lamsimenterprises.com/
<http://blog.lamsimenterprises.com/>
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx
]
On
Behalf Of Boris Bakshan
Sent: 7-Jan-17 1:16 PM
To: Lee Ritchey
Cc: si-list
Subject: [SI-LIST] Re: An Article on what ground is
Hi Lee,
Thank you for prompt reply.
So, in fact, you are making a direct connection between the
backplaneground of
the cards and the metalic chassis enclosure so that
enclosureground (return
path of signals) , cards logic ground and metalic chassis
planeare all
connected, did I get it right?
On Jan 7, 2017 7:57 PM, "Lee Ritchey"
<leeritchey@xxxxxxxxxxxxx> wrote:
> Thanks for the nice feedback.
> Aha! You have asked an EMI question! I use the ground
backplanein a
> backplane as one side of my Faraday cage. Where that
top layermeets
> the flanges on the card cage, I leave the copper on the
backplane.Âand
> connect that with vias to the ground plane in the
FaradayNow,
> there is the one connection between logic ground and the
if onecage.
> There can be no other connections such as on face places
whenis to
> avoid "leaking" at the cracks which is a common complaint
Faradaymore
> than one connection is made between logic ground and the
good EMIcage.
> Notice, I did not use the phrase "chassis ground" in this
discussion.
> I have used this method in dozens of systems with very
results.
> Hope this helps.
> Lee
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx
<mailto:si-list-bounce@xxxxxxxxxxxxx> ]
> On
> Behalf Of Boris Bakshan
> Sent: Saturday, January 7, 2017 5:24 AM
> To: Lee Ritchey <leeritchey@xxxxxxxxxxxxx>
> Cc: si-list <si-list@xxxxxxxxxxxxx>
> Subject: [SI-LIST] Re: An Article on what ground is
> Hi Lee,
> Very good, comprehensive article, thank you.
> What is your recommendation when it comes to backplanes? a
mechanicalbackplane
> is attached to the chassis with bolts/other conductive
backplane?> parts. Do you recommend plating these PCB holes in the
electrical net?If
> you do, should these holes be connected to (any)
the> Thanks Lee.
> On Fri, Jan 6, 2017 at 10:43 PM, Lee Ritchey
> <leeritchey@xxxxxxxxxxxxx>
> wrote:
> > I have written an article on ground following the brisk
exchange on
> > this subject last month. I hope it clears up some of
Subjectconfusion
> > around this subject.
> > Here is where it is on the web.
> > http://ubm.io/2ikEDat
> > Lee Ritchey
> > Speeding Edge
> > P.O. Box 2194
> > Glen Ellen, CA
> > 95442
> > 707-568-3983
> > I just used the energy it takes
> > To get mad and wrote some blues.
> > Count Basie
> > Or:
> > Worry is like a rocking chair,
> > It keeps you busy but.
> > It doesn't get you anywhere.
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