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> It's modulated and demodulated into analog format. Hence
> MoDem.
Actually, even though DSL and Cable "modems" perform their signaling in the
RF spectrum, they don't use frequency modulation for the physical signaling,
so they aren't really modems.
> Im sure the
> modem does error checking on THAT process, but the tcp/ip
> error checking is
> done when the packet is sent up the stack, which happens at
> the driver level,
> not the modem level.
Correct. Although some of the new Ethernet cards to TCP/IP CRC checksum
validation in hardware now, instead of sending it up the stack, alleviating
this burden on the host CPU.
> I'm sure Stan can describe this process better.
I'd really rather not spend the time necessary to explain DSL or cable
"Modem" signaling in depth right now... :) Suffice it to say that most DSL
and cable "modems" are capable of over 10Mb/s of raw signaling rate with
full CRC. This is not going to cause any OSI Layer 3 (TCP/IP) packet
latency.
StanTheMan
TheHardwareFreak
www.hardwarefreak.devastation.cc
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