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I hear these terms a lot. I can't figure out the difference though. I have a T1 line for my internet (I'm fairly sure). It can do a max of 1.5 megabytes per second (well like 56k dialup it won't get that fast but you know what I mean). When it was installed, the guy went to a website to clock the speed. The site said I was going at 2.2 megabits per second. Just today I got an advertisment for a computer with a gigabit networking card. i had always thought that networking cards worked in mega/gigabytes. Like a normal card is 10/100 megabytes per second. (This card was 10/100/1000). Could someone please explain what the differences are, and when they're supposed to be used to classify something? Thanks.
<><><>Tope<><><>
Nearly all data transssmission speeds are measured megabits oer second, including 10/100 Mbps network cards. A 56K dielup is 56 megabits. 1.5 megabytes per second is an enormous data transmission speed. The sort of speeds used on the internet backbone. Not something the average user would have direct access to.
Confusion arises as Mbps if often used for both Magabits and Megabytes. The context can usually determine which one it is. However, if there is liekly to be confusion it better to spell it out Megbits per second or Megabytes per second.
Stuart
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i was always told that megabits should be Mb and that megabytes should be MB but a lot of people don't follow that..
and of course
1 MBps = 8 Mbpsi think :)
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Jill is right. Also the correct abreviasion for mega should be a lowercase m, but a lot of people dont follow that either, including me sadly.
Tope: Typing error in my last post. A dial up is 57 kilo bits per second. 2.2 mega bits pers second on a dial up is impossible. We are talking DSL speeds there and fast ones at that.
Stuart
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I amazed that this is still so condusing for everyone
The most important divisable is 1048756
sleep on that
OUT!!!!!!!!!!!!!!!!!!!!!!!!!!
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1048756 = 2^20
A megabyte.
Great thing about the system is that you don't have to actually count in binary. You can follow metric conventions (by 10's), so 2^30 would be a gigabyte, 2^40 a terabyte, etc. Nice convenience for unconverted minds.
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Stuart, I have cable. In the first few lines of my first post I said I have a T1 line (as far as I know I do).
<><><>Tope<><><>
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Don't know what a T1 line is. American terminology I'm not familiar with. I always thought a T1 line was some kind of telephone line.
Stuart
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Stuart
FYI T1, T2, T3 is covered at
http://computing.net/hardware/wwwboard/forum/20770.html
Cheers
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Stuart,
If you are in Europe, the T1 is more like a E1 link, but slower.
Tope: The T1 bandwidth, isn't 1.5Megabytes, but 1.5 Megabits!!!
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Danny:
I'm in the UK, and thanks to British Telecom, out internal communications system is different than the rest of the world. So E1 doesnt mean much to me either although I'm beginning to get the gist of it.
Stuart
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hi
in transmission, you have the differences between the Europe, Asia and US.
a
T1 = used in asia and US has @ speed of 1536 kbs. ( 24* timeslots of 64 kbs )if you have a structured one (G704, you wil lose 1 (64 kbs) timeslot for the managment of this line.
E1 = used in Europe @ a speed of 2048kbs (as called a 2 megabit) if used a structured one you will have 31 ts (64kbs) which makes 1984kbs payload, and one for the management. if you use a plain 2meg (g703), it makes you win one ts and your speed will be 2048kbs/s so here comes the name: a 2 meg.
if you want to interconnect the vs or asia with Europe (eg a leased line) in Europe, they need to connect with a structured E1 (G704), with the last 6 timeslots closed(this makes 1536kbs =T1)
in Europe, we have a
E1 = 2048 mb/s
T3 = 34 mb/s
E3 = 45 mb/s
STM-1 = 155mb/s
STM-4 = 622mb/s
STM-16 = 2.5 gb/s
STM-64 = 10 gb/sThe last 4 lines are only backbone lines used by providers and verrry expencieve, the transport of these lines happens most of the time by Dence Wave Division Multiplexing (but that's to long for explaining, my post is already long enough ;-)
Hope this clear some things outregards
ZZ
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G'day,
Just a slightly off topic question. Stuart, since when did Mega become a small m? I've just looked at my SI standards of units (it is a little old)and it clearly states Mega as a capital. Does this mean that we also write mHz (milli Hertz or Mega Hertz)and what exactly is 1.0 mohm? If someone said they were going to send 10mTonnes of manure, would you need a big bucket or a small one.
I've also seen kbs/s, kbs, kb/s and kbps; which one is correct? (Surely the s in there represents seconds and not the plural!)
Think I'll have to brush up on my units of measurement given this new paradigm.
regards,
Elric
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Your right Eric. Mega should be an upper case M. Milli is a lower case m. Kilo is a lower case k. Terra and Giga are also uppercase.
So why is kilo lowercase?
I think convention puts bytes with an upercase B and bits with lower case as this is not an SI unit.
Stuart
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G'day Stuart,
Those questions were not directly aimed at you particularly, but I was interested in the thread and just couldn't follow the units that were being used. I think that there is a little bit of confusion with my engineering experience of SI units and how modern IT units are defined.
The unit bit is b and byte is B and that is recent and fine by me ( I wasn't aware of that before I read this thread). But 1 Mb is 1 million bits and 1 MB is 1 million bytes ( that is exactly 1 000 000 bytes).
This has bothered me for some time, and if you follow the link at the end of this post, you will see what I mean. Accordingly, 1 kB is 1000 bytes and 1 KiByte is 1024 bytes (note the change from lower case k to capital K) But 1 KiB means 1 kibibyte (no I'm not joking..)so 1 KB does not exist.
I think the computing and IT advances in the last years have thrown up these inconsistences (hence my question about since when...)and they are just settling in.
To answer your question about lower case k:
it was to avoid conflict with Kelvin the unit of absolute temperature measurement.
Have a look at this link anyway:
http://www.unc.edu/~rowlett/units/prefixes.html#binary
Go to the definition of MHz.
regards,
Elric
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ok, first off. you dont have a T1 connection, they're extremely expensive. if you want to prove to yourself that you dont have a T1 connection go take a connection connection test and tell me what you get. if your upload is higher than 256, you have a T1, if its 128, then you dont. and to answer your question instead of all this other gibirish that these people are saying, a megabit is used in data transfer and a megabyte is using in stored data. like your internet connection speed would be in kilo bits and your hard drive would have a maximum of lets say 24000 mega bytes
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I got 3146 for the download (something like that, it was 3,000 something I know for sure). The upload was 238.
<><><>Tope<><><>
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hmmm... sounds like you got a very good cable connection, not T1 though, sorry. if you had T1 you'd have at least 600kbps upload and you wouldnt have a download that fast
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hmmm, not agree, fbi agent,
@ a T1 connetion, you can have upload up to 1.5 mb, depending on the traffic and if there are no bottelnecks on the rout to you dest.
if your upload is > then 256, it doesn't mean you have a T1. As I told before, take 64, that's one timslot, you can take upto 31 if u like ( and u pay offcourse ) pay for 4, you have a 256kb/s, take 8 and you have ... a 512kb/s and so on...aslong if 64 fits into it, and u pay for it, you can have anything you want ;-)
greetz
zz.
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hello!?!? try and read
"..very good cable connection, not T1 though.."
and most commonly you'd see a T1 conneciton as 1.5mbps up/down
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oops, sorry, late in the office makes me blind :-( a little bit....
a good site for this kind of things is http://whatis.techtarget.com/definition/0,289893,sid9_gci214198_s:d9,00.html
here, you can find allot of info..
cheers (and sorry again)
zz.
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