F
FatBytestard
- Jan 1, 1970
- 0
Some other clever fellow figured out how to send voice signals through the
wires - voila! The telephone.
That person was NOT A. G. Bell, however.
Some other clever fellow figured out how to send voice signals through the
wires - voila! The telephone.
Have not seen anything from her today. Perhaps *she* has crossed over.Rich Grise wrote:
[snip]
Maybe it would be easier to explain to Sylvia that the
reason we have cross-over cables is because cross-under
cables are too expensive to build.
Sure it was, he just wasn't the only one or necessarily the first.
Exactly who invented the telephone first is largely a question of how you
define "telephone"
and whether or not you want to trust people who might have
built such a device but didn't document it for posterity...
You don't have to tell me. I have known about him for years.
Obviously, I think she is right in this sub-thread. I also tend to
agree with her original post although others have explained why,
historically, a crossover cable was not standard and why there was a
distinction between terminal and communication equipment.
The only point I might disagree with her on is the assumption that
"this situation persists". Modern interfaces, like USB, use a single
pair of wires for communication which avoids the problem.
Just means those pins would be tied to ground. This would have required
more than the 9 pins on modern serial ports, but would have been easily
done with the original 25 pin standard.
Did something similar with a telephone in my teens, by pulsing the
handset rest.
No luck about it. Make-and-break dialing STILL works.
Want to play a game?IIRC it was used in "War Games" (1983)
And if they're two identical NICs?
Jasen said:there's not such thing,
derive the timimngs from the mac address
AnimalMagic said:A cross-over cable most certainly WAS and IS the standard for attaching
two like terminals through this interface (serial)
There may be a standard that describes the process of identifying the
wires. Whether there is is what I asked.
David said:I don't think it requires a "standard" to identify the wires. A NIC
must be able to identify a valid packet so swapping two wires until it
does so is not a demanding task now that a microprocessor is
incorporated on every device.
Sylvia Else said:I was thinking that a standard would be required that specified the
delays, or the means of calculation of the delays, to be used between
trying different combinations, so as to avoid the situation where two
NICs undermine each other's attempts to find a working combination.