Not really web-hosting but I have a question that the people in here could probably answer while sleeping.

What connection speeds are there and what is their actual speed ?

28k = 28k a second ?
56k = 56k a second ?
cable = ?
? = ?

Also, what about upload and download speeds. Are they the same ?

I am on a 56K dial-up and when I download something it starts at about 10k a second and then slowly drops down and down to about 2-3K a second. What is up ?

Thanks heaps for your help, it is very gratefully appreciated.

Stephen.

28k is actually 28.8 kbps. That is, 28,800 bits per second. Divide that by ten (8 bits plus a start/stop bit), and you get 2.8 kilobytes per second. The math follows for 56k connections. (Of course, nowhere can you actually get a full 56k connection.)

Cable connections can often go up into the megabits per second range, as in over 1000 kilobits per second. That's substantially faster than a modem can provide.

The download speed you're seeing is an estimate provided by your browser (or FTP program) and is inaccurate until it averages out a bit. Unless you're downloading a text file and taking advantage of the modem's hardware compression, you'd never actually see transfer rates like that.

So how many different types of connections are available.

28k
56k
Cable
T1
T2
T3
ADSL
DSL

Are these correct and are there more ?

Thanks kindly.

There aren't any T2's. Your list covers the most of them, although with fiber running all over the place, we'd have to include:

OC-3
OC-12
OC-48
OC-192

...and so on. Each "1" on an optical circuit is about 45mbps, or the same as an old T3. So, an OC-3 is equivalent to three T3's (DS3's), and on up from there.

A friend of mine is using a 14.4 kbps modem. Slow, I know, but if all you're doing is e-mail it works.

You missed one, as I would have also. I just learned the other day that there is such a thing as a T-8. My cable provider is installing them. New one on me...

Originally posted by Travis
There aren't any T2's. Your list covers the most of them, although with fiber running all over the place, we'd have to include:

OC-3
OC-12
OC-48
OC-192

...and so on. Each "1" on an optical circuit is about 45mbps, or the same as an old T3. So, an OC-3 is equivalent to three T3's (DS3's), and on up from there.



Each one on OC is actually about 52mbps not 45. Hence OC-3 is 155mbps.

For our Eurpoean friends, there are E2s.

A T8 is probably just 8 bonded T1s, similarly you can bond 4 T1s together as well to get a T4, most vendors have router cards for this.

Originally posted by Travis
There aren't any T2's. Your list covers the most of them, although with fiber running all over the place, we'd have to include:

OC-3
OC-12
OC-48
OC-192

...and so on. Each "1" on an optical circuit is about 45mbps, or the same as an old T3. So, an OC-3 is equivalent to three T3's (DS3's), and on up from there.



OC-3 is about 155 mbps...
OC-192 is about 10 Gbps...
Do you know what? In the lab next door, they are start researching fiber transmission at about 80Gbps - 160Gbps :)
Don't ask me how, though... ;)

cheers,
:beer:

I was reading some article that they have made light travel faster than the speed of light (which would make time travel true). They are going to be able to use this technology later to transmit fiber they said. Like this is the best way I can show how this works

Normal Flash light.

Turn on Light
{==O- o
1 ms later
{==o----- o
4 ms later
{==o-----------------------o

How they did it

Turn on light
{==o- -o

It basically eliminates the travel, everything is instantaneous WHICH rules out the whole idea of cause and effect. The cause now comes instantly with the effect. I think its pretty cool, I will try to dig up the article later.

James R. Clark II
Nethosters Inc.
http://www.nethosters.com

I forget what kind of gas. However we are still a good 15-20 years before we could ever come close to making it usable.

Also, it isn't exactly time travel either. The light beam is just already there because of this gas and mechanisim they used, there is speculation about the whole thing because about 65% of the communities that I talk on say it was only faster than light by numbers, and not truely faster than light.

Just like a company firing it's best employee because "the numbers" were working against him. It doesn't matter if he/she just sold a 50 billion dollar company and can easily do it again. But since the numbers rule all for many people, this is where we become blind.

Originally posted by uuallan
A T8 is probably just 8 bonded T1s, similarly you can bond 4 T1s together as well to get a T4, most vendors have router cards for this.

No, Tn is not n T1s bonded together, and (for the other poster above), T2s do exist.

A T1 transmits at 1.544 Mbps and is designed to carry 24 64 kbps data (voice) channels plus an 8 kbps control channel.

A T2 transmits at 6.312 Mbps and is designed to carry 4 bit-interleaved T1 channels, plus a 136 kbps channel for framing and error recovery.

A T3 transmits at 44.736 Mbps and is designed to carry 7 bit-interleaved T2 channels, plus 552 kbps for framing and recovery.

And finally a T4 transmits at 274.176 Mbps and is designed to carry 6 bit-interleaved T3 channels, plus 5.76 Mbps for framing and recovery.

And nothing else was ever defined. After that point, AT&T was broken up, everyone switched to fibre-optics, the US telecoms finally started to listen to their European counterparts, and SONET was born.

FWIW, non-US telecoms used 2.048, 8.848, 34.304, 139.264, and 565.148 Mbps channels which carried 32, 128, 512, 2048, and 8192 voice channels respectively. Now, of course, we see the OC-1/3/9/12/18/24/36/48/72/96/144/192 hierarchy that everyone is so familiar with.

Ok, class dismissed ;)

Not DSL, but the DS-1 DS-3 etc.

Whats the schtik about those?

Originally posted by mysitehost
Not DSL, but the DS-1 DS-3 etc.

Whats the schtik about those?


DS-n means T-n.

Technically, T1, T2, T3 and T4 refer to the carriers while DS-1, DS-2, DS-3 and DS-4 refer to the format. (So T1 means "signalling at 1.544 Mbps", while DS-1 means "containing 24 byte-interleaved 64kbps voice channels plus an 8kbps signalling channel").

Why name them differently?

Or is it like renaming fried squid to calamari so that people will eat it?

OC-3 is about 155 mbps...
OC-192 is about 10 Gbps...
Do you know what? In the lab next door, they are start researching fiber transmission at about 80Gbps - 160Gbps :)
Don't ask me how, though... ;)

cheers,
:beer:

any chance of elaborating on who the company is 'next door', or where you are ?

Also, how did you find the beer smiley. Got a link where there are more to learn ?

Gopher,
Not to digress the topic,
You might wanna click on "smilies" at the bottom of this page, just above the footer line. A good starting point for getting smilies would be http://smilecwm.tripod.com
Also click on the "vBcode" link at the line above smilies to know more about embedding whatever in your messages.

Yeah, I read about accelerating light too.

And in a different experimetn, they made two particles of a quantum pair separated over a looooooooong distance. They found that one reacted to the quantum state change of the other at a speed faster than the speed of light.

Will post more on this in the general conversation forum later sometime.

Wing.

These smilies only work in this website
:flamethrower: