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From: eclarke@pisces.paloalto.ibm.com (Eric S. Clarke)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: FCC Class A / Class B Certification
Message-ID: <1990Jul31.212826.6636@ibmpa>
Date: 31 Jul 90 21:28:26 GMT
References: <526@wjh12.harvard.edu>
Sender: news@ibmpa (news id)
Reply-To: eclarke@pisces.paloalto.ibm.com (Eric S. Clarke)
Distribution: usa
Organization: IBM Advanced Workstations Division, Palo Alto
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I have a bit of experience in this area.  First, class A & B certifications
are not a guarantee of anything.  If either a class A or a class B
device causes
interference with someone's TV, radio or other reception device (including
telephones), you will be required to take what ever steps are necissary to 
eliminate the interference.  For the good news, this is not really a problem.
Most devices that are either class A or B will not cause any trouble.

If a device does cause problems, there are several easy steps to solve most
problems.  First you can just move the device.  Most computers don't transmit
their interference more than a few feet.  You can also add a more reliable
ground than the original.  The FCC has a good book, if you still need more
help.  The FCC has been hanging around a lot of computer shows recently to
ensure certification compliance.

As far as home-brew systems go, they have no certification.  If they cause
problems you will have to fix it.


Eric S. Clarke                             UUCP: uunet!ibmsupt!eclarke
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