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RE: FCC Part 15 (CFR 47) Class A

I did not reply any more in the previous thread because of your augmentative tone. It seemed unlikely that any light would be shed by further discussion.

I don't know Cisco's certification policy, but I would guess at the time the switch was first marketed that the 16 port switch was not marketed for home use. Therefore there would be no need to certify it as meeting Class B, which would have entailed extra testing and certification costs and well as the risks of being found non-conformant due to manufacturing defects or measurement tolerances, even if the product did conform to Class B. It would be the decision of the Cisco product manager as to what categories to certify a particular product and in which countries. Other factors entering into this decision would include time to market issues and costs of revising published product documentation due to additional certification after initial product shipment.

Emission tests are in two categories, conducted and radiative. Conducted tests concern noise put onto the power lines, and these go down to 150 kHz. Radiated tests start at 30 Mhz and go up. The discussion in the other thread concerned the impact of spurious audio on the analog outputs of a DAC, something that is not covered by these government regulations, except possibly indirectly.

Tony Lauck

"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar

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