View Full Version : Copper Wire

Scabrous Birdseed
25-06-2003, 21:14:58
What are the limits on these things? Just a few years ago ISDN's 64k was an absolute, unbreachable roof, and now one company here in Sweden is offering 26 MBit VDSL (http://www.bonet.se/page.php?xml=swe/pages/private/scream.xml&context=private) for people who live less than 300 metres from a telephone exchange (ie. people in appartment buildings basically) at the very reasonable price of 400 kr/month (about $45 or $30). Apparently DSL modems can handle 52 MBit. Through copper wire? Jesus!

Sir Penguin
25-06-2003, 22:15:30
Well, I've read that in theory you can get close to the speed of light through copper. The only limits are length and quality of the wire. In fact, some groups are trying for 5-6 Gbps over copper. Admittedly, only a few feet of copper, but still...


25-06-2003, 22:57:33
It all travels at the speed of light, for short distances, SP.

Sir Penguin
26-06-2003, 01:31:47
Isn't that about what I said?


Qaj the Fuzzy Love Worm
26-06-2003, 16:24:04
It's the same principle behind farts moving at 120 km/h, but you can't smell them on the other side of a large room due to all the air the smelly molecules bump into on the way. At least, that's what they taught us in high school. I had a great 9th grade physics teacher :) There's not too many other people on the face of the earth who would throw the school's entire supply of sodium in a puddle to demonstrate chemical reactions to his class :)

26-06-2003, 16:34:37
our Chemistry teacher only tossed a gram or two into a big beaker of water. Fun.
He also put a goldfish in a beaker of water and put it under enough vacuum to make the water boil. The fish was swimming on its side for the rest of the day, and dead the next. Ruptured swim bladder, I think :) PETA would have got him fired and arrested.

The more you force through that wire, the more bumping around of molecules and electrons - more heat, increased resistance, yet more heat... fire... yes?

27-06-2003, 22:03:52
My chemistry teacher set fire to the classroom.

Scabrous Birdseed
28-06-2003, 09:28:57
My chemistry teacher spoke in a mixed Geordie-Kiwi accent.

28-06-2003, 16:25:43
I never had a chemistry teacher.

29-06-2003, 14:49:16
I got away with not working for three years in secondary school until my chemistry teacher gave me a '5'. (Effort rating 1. Excellent 5. Baaaad).

I can blame her for getting all manner of unwanted GCSE's and A Levels. Dammit. :bash:

Scabrous Birdseed
29-06-2003, 15:14:49
Ahh, chemistry teachers. Can't live with 'em, can't live without 'em.

30-06-2003, 20:33:06
Yes you can...it's called an English degree.

Scabrous Birdseed
30-06-2003, 20:47:04
You got a college degree without going to high school?

30-06-2003, 21:00:12
Yeah...skipped straight from 8th grade to College...quite the prodigy I was.

No...Science was required...just not Chemistry specifically...I took Biology...and Astronomy and Electronics.

No longer Trippin
08-07-2003, 05:04:32
About 300 feet is the limit unless they increase the voltage to overcome the resistance to get good signal transfer. Cable runs on copper, though the signal is boosted once it hits the junction, and you need a booster every 150 feet at a mininum until you reach the main line.

The max for SCSI with one drive is 200 feet IIRC - that's on copper. Sounds like they are pretty much taking a similar approach, just not with the interface SCSI uses and they are going to be pumping a bit more juice into the line since it's outside.