I'd be very curious to see what the others think of the clause that Bill
quoted.
I know the standard specifies ISN and it is "available" - if the definition of
available means one can buy it. Therefore it can be read as ISC "shall" be
used. I also know that what the standard specifies does not alw
Please, can anyone help me clarify this? In telco interfaces, e.g. FXS, FXO,
xDSL, if I have a clamp device for lightning protection connected from lines
to the safety GND, is the safety isolation requirement still met? Assume that
without the clamp device all the clearances and hi-pot are OK. Than
On powered Ethernet interfaces, 48 VDC is delivered from Ethernet switches to
IP phones with + over one twisted pair and - over another pair of a CAT5 cable.
The power is not permanently connected to the connector or cable. It is
switched to the socket/plug only if an IP phone is detected on th
Agreeing with both, I wish to add that while the probes are very useful in
locating the source and are not (very) useful in predicting the absolute level
of far-field emission they may be also useful to predict relative far-field
difference in emission, because with all other things equal the f
The usual parameters given with TEM cells are field uniformity and input
impedance (or VSWR). Although they may appear to be very good up to the
declared frequencies of operation, which depend on the transversal size of the
cell, they are only good for empty cells. Presence of any conductor in
Little belated response, but I thought it may be worth sending it anyway.
Laboratory Report: "Common-mode impedance measurements on cables in the
frequency range 10-1000 MHz", report no. EIE 92004, by Mart Coenen from Philips
in Eindhoven, the Netherlands, is probably the best reference on this
> Pardon my naivety, but how does '100 Mbit' relate to
frequencies of 30 and 60 kHz? Is this 100 Mbit per week?
(;-)
> --
> Regards, John Woodgate, OOO - Own Opinions Only.
http://www.jmwa.demon.co.uk
First, a little background on auto negotiation. The IEEE
802.3u 100BaseTX auto negotiatio
You are seing a spectrum of MLT3 signal, which is 100
Mbit coding. Increased broadband emission is caused
because some of the differential mode (DM) signal is
either converted into common mode (CM) due to imbalance
in the differential signalling or because you have some
power/"ground" "noise"
> >On the other (AUX) side of the transformers conect
the center taps directly to the ground panel. You don't
care about high-voltage isolation in this application,
so you don't need any caps.
>
> How do you cope with ground potential differences,
with centre-taps
> grounded at each end of
Using fiberoptic link is best if you can do it. However
even so you need another end of the twisted-pair cable
connected to another 100 Mbps device. You may check that
device by looping it back on itself first and performing
the immunity test on it. If it passes, it is safe to
asume that it w
Beware that stainless steel has high impedance in GHz
range, about 50 times higher than copper. That seriously
degrades performance at high frequencies relative to
BeCu or other good conductors.
Neven
>
> Rick,
>
> Chomerics' Springline product line is an off-the-shelf solution:
>
> h
Oooops,
my reply was really relevant to Compact PCI panels, not
PCI. Sorry, I just realized it.
I haven't worked on designs using PCI brackets for EMC.
I believe that former Instrument Specielties, now part
of Laird Technologies, can help you. They are very
knowledgeable in the area of shiel
There are several types of gaskets. The ones with a
continuous ridge along the centerline (inverted V-shape)
are not compliant thus they can leave slots and cause
difficulties with board insertion. The spiral gaskets
make good contact but tend to kink, get caught and fall
out of the groove in
Chris,
from what you described, it seems that a common-mode
(CM) filter on all three lines would be a good approach.
That will not reject your single-ended signal.
Coupled RF will mostly come as common-mode carried by
the wire, thus that is what you want to reject in the
first place. A good
Using 1206 will force you to have (probably
significantly) larger inductance than with 0805 or 0603.
Inductance is the most important parameter above about a
couple of MHz, because that will determine the
decoupling impedance. Therefore you may decide to use
all one value (except for the bulk
Then it will work as an electrostatic (DC or low
frequency electric field) shield. For all other
prectical high frequency aplications you'll need it
connected on both ends.
You can find good explanations, beyond this simple
answer, in either Clayton Pauls's book "Introduction to
Electromagne
Based on little info you have provided, I am making the
following assumptions.
1) The noise is broadband noise coming from MLT3 signal
(by "fast" you mean 100 Mbps?).
2) It is not from the power supplly, which can also
radiate similarly looking noise in this portion of the
spectrum.
You can f
Hello Group,
the private company I was with has laid off large number
of people due to current market conditions, and I am in
position to look for a job. I am located in SF Bay Area.
Does anyone know of any opening that would match my
experience, which is in the EMC/SI and Compliance area.
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