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Technology Stocks : COMS & the Ghost of USRX w/ other STUFF -- Ignore unavailable to you. Want to Upgrade?

To: Scrapps who wrote (8970)	11/11/1997 12:48:00 PM
From: drmorgan	Read Replies (1) \| Respond to of 22053

What about if it were in a socket? They could do that. The thing I want to understand about a modem chip on the motherboard is how are they going to deal with tip and ring voltages? The phone line does carry voltage and precautions have to be taken when designing a modem so not too high a voltage reaches the circuit board and starts a fire from exploding inductors or capacitors. This part of the modem, known as the DAA has some fairly heavy power requirements and as a result of that uses some failry large components like Fuses, inductors, capacitors etc. When the modem is built it has to pass strict FCC and UL requirements by sustaining a very high power surge over a period (short) of time. I think it's a 1,000 volts applied for just a second or two and those power components have to sustain this voltage blast. I've seen modems catch on fire (in the lab) because of component failures usually due to a result of experiementing around with different DAA power components and changing the values of those components for various reasons. So I have to ask, how will the motherboard deal with all the power requirements of the modem chip? Your phone line voltage is not going to change and the same kind of power components are going to need to be used. I don't see that they can put these power components inside that chip, or should I say on the silicon. I sure would like to see a modem chip on a motherboard work, and pass FCC and UL requirements. Derek