What Rogers call 'service' [was: Micro Routers (Was: : Raspberry PI (as router))]

[Bob Jonkman]

:)  In Ethernet there's preamble bits, Ethernet framing header bits, IP
header bits, TCP header bits, application protocol header bits...  On
average, it still works out close enough to 1 byte of data for 10 bits
transmitted, depending on the size of the data payload. Close enough for
a for a back-of-the-envelope calculation, anyway.

Good to see the old technology is remembered not just by me, though.

--Bob.


On 06/13/2012 08:22 AM, James Knott wrote:
> Bob Jonkman wrote:
>> accounting for start bits, stop bits, and other bits
> ????
> 
> Start & stop bits went out with dial up modems.  Ethernet uses
> synchronous communications, not async.  With async, each character was
> sent independently from the rest and contained it's own start and stop
> bits, so you'd have 1 start bit, 8 data bits and one stop bit (assuming
> ASCII at greater than 110 b/s).  With Ethernet, you have frames
> containing address info, data, check data and more, sent as one large
> block.  With Ethernet, the data portion is limited to 1500 bytes, but IP
> supports up to 65K bytes, IIRC.
> -- 
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