Dear All,
Below is a link that lists ethernet switches that have Class A
compliance. I am not clear how this is being sold in the Europe market.
http://www.foundrynet.com/pdf/ds-ei-cf-g.pdf
Sincerely
K.Balasubramanian
Project Leader - Hardware.
John Woodgate
<[email protected]
o.uk> To
Sent by: [email protected]
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Subject
04/26/2007 06:45 Re: Digital media reader Class A or
PM B
In message
<ofe7c858a0.2d948a07-on652572c9.00427bd1-652572c9.00460...@scmmicro.co.in
>, dated Thu, 26 Apr 2007, [email protected] writes:
> We are planning to sell ethernet based smart card reader in
>Europe (German) for attendance recording. There is no intentional
>radiator in this device. Will this need a Class B approval ? My
>understanding is as per CISPR 22 only telecommunication equipment and
>personal computers / accessories used in home environment need Class B
>approval in Europe.
>1. Usage of the device in small offices will be treated as domestic
>use or business / commercial / industrial use.
>2. I believe a device connected to the network server through
>ethernet is not a personal computer accessory.
>3. Ethernet devices are not telecommunication network devices, I
>hope I am correct.
>4. Personal computers used in business / commercial / industrial
>environment require only Class A.
>
> I request your guidance.
This is a VERY difficult subject. To be CERTAIN of having no problems,
you need to meet Class B.
The basic problem is that in Europe, 'residential, commercial and light
industrial' are ONE environment, and Class B applies. This is
fundamentally because the concept of 'EMC environment' isn't very
satisfactory, but we don't have any better concept to replace it.
For example, consider a retail shop - that's a 'commercial' environment,
at the 'social' level, for sure. But if it were also an EMC environment
differing from 'residential' in allowing Class A, equipment in the shop
could interfere with equipment in a house next door to, or a flat
(apartment) above, the shop, because radio and TV receivers would be
within 10 m of the disturbance source. Class A equipment need to be more
than 30 m away from the receivers to make interference sufficiently
unlikely.
In Europe, it is thus not allowed to operate Class A equipment in the
'residential, commercial and light industrial' environment, whereas in
the Americas it IS allowed, provided that any resulting interference is
eliminated or sufficiently mitigated. This is, of course, likely to be
costly unless an acceptable re-positioning of the equipment provides a
solution.
Because of this difference, a realistic view was taken in Europe of the
provisions in CISPR 22, and it was not considered essential to introduce
a Common Modification in EN 55022 to change those provisions.
This situation continues to result in confusion and doubt, but there
seems to be no practicable resolution.
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
There are benefits from being irrational - just ask the square root of 2.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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