Theoretical Data Transfer Speeds

This data was originally compiled by Cannon Smith and posted to the Mac EvangeList, Digest #296. It is a great comparison, and I knew I had to convert the email to tables and save as a web page. Content is unchanged. Has been reformatted.

Subject: [Follow up] Summary of different device, etc. speeds
From: "Cannon and Nicole Smith" <can-nyk@agt.net>
Date: Wed, 11 Oct 2000 00:40:04 +1100
 
------------------------------------------------
Shane's Antler!
My own personal thanks to all who contributed to
this! You guys (generic) SHINE!!  :)
------------------------------------------------
 
First a big thank you to all who pointed me to an article or gave me
information directly.  I had a LOT to wade through and try to match up.  I
thought this would make a nice little project and as you can see, it turned
into something fairly large.  I need to put a bit of a disclaimer in here
since there was a little bit of conflicting information between different
sources so I took the liberty of putting down what made sense to me.  Also,
I haven't even heard of many of these technologies so I wasn't able to
realize if they made sense of not.  And some of the technologies seemed to
have different designations for the same thing, but I was never 100% sure.
And lastly, as I read in one article, we have to remember that this is the
theoretical throughput, not counting stop bits, parity bits, headers,
compression of data, line static, etc.  Anyway, this was very interesting
and useful to me and hopefully it will be useful to others as well.  If
anyone sees some mistakes I've made (typing or otherwise), please let me
know.  Thanks.
 
Cannon Smith
 
-  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -
 
First, a bit (pun intended :) )  to understand the notation used; watch
uppercase and lowercase.
 
1 bit is either a zero or a one
1 byte is 8 bits (the amount of bits needed to represent a character on a
page)
 
Most of the time in computerdom, each prefix is 1024 of the previous prefix.
For example, 1 Kb is 1024 bits and 1KB is 1024 bytes. 1 Mb is 1024 Kb  and 1
MB is 1024 KB.  There has seemed to be a bit of a movement toward rounding
this off to 1000 instead of 1024 at times, so keep this in mind when reading
these symbols in some places.
 
ps as in Kbps is for per second (Kilobits per second).
baud is equal to bps (bits per second)

Prefix Symbol Bit Notation Byte Notation (bit * 8) Equivalent to
====== ====== ============ ======================= =============
kilo K Kb KB
mega M Mb MB 1024 K's
giga G Gb GB 1024 M's
tera T Tb TB 1024 G's
peta P Pb PB 1024 T's
exa E Eb EB 1024 P's
zeta Z Zb ZB 1024 E's
yotta Y Yb YB 1024 Z's

Here's the list.  In the end I decided to sort it by relative data transfer
rate (speed).  Oh, I decided to add some raw speeds at the beginning to show
the difference between bps and Kbps, etc.

Carrier Technology Theoretical Throughput Transfer a 1 MB file
=================================== ====================== ================
bps 1 bps 8,388,608 sec (~97 days)
Bps 1 Bps 1,048,576 sec (~12 days)
Kbps 1 Kbps 8,192 sec (~2 1/4 hours)
KBps 1 KBps 1,024 sec (~17 minutes)
Mbps 1 Mbps 8 sec
MBps 1 MBps 1 sec
Gbps 1 Gbps 1/128 of a sec
GBps 1 GBps 1/1024 of a sec

300 baud modem 300 bps 27,962 sec
1200 baud modem 1200 bps 6,990 sec
2400 baud modem 2400 bps 3,495 sec
9600 baud modem 9600 bps 873 sec
GSM mobile telephone service 9.6 to 14.4 Kbps 853.3 to 568.8 sec
ADB 10 Kbps 819.2 sec
14.4K modem 14.4 Kbps 568.9 sec
28.8K modem 28.8 Kbps 284.4 sec
POTS Regular telephone service Up to 56 Kbps Low as 146.3 sec
Dedicated 56 Kbps on Relay 56 Kbps 146.3 sec
Frame Relay 56 Kbps to 1.544 Mbps 146.3 to 5.1 sec
General Packet Radio System (GPRS) 56 to 114 Kbps 146.3 to 71.9 sec
One-channel ISDN 56 to 64 Kbps 146.3 to 128.0 sec
56K modem 56.6 Kbps 144.7 sec
DSO 64 Kbps 128.0 sec
High-speed circuit-switched data service (HSCSD) Up to 90 Kbps 91.0 sec
Two-channel ISDN 115.2 to 128 Kbps 71.1 to 64.0 sec
IDSL 128 Kbps 64.0 sec
Serial Port 230 Kbps 35.6 sec
AppleTalk (LocalTalk) 230.4 Kbps 35.6 sec
Fractional T-1 256 Kbps 32.0 sec
Enhanced Data GSM Environment (EDGE) 384 Kbps 21.3 sec
"384K" DSL 384 Kbps 21.3 sec
Satellite (DirecPC) 400 Kbps 20.4 sec
Fractional T-1 512 Kbps 16.0 sec
DSL 512 Kbps to 8 Mbps 16.0 to 1.0 sec
DSL/Fractional T-1 768 Kbps 10.7 sec
Standard parallel port 115 KBps 8.9 sec
DS1/T-1 1.544 Mbps 5.1 sec
Universal Mobile Telecommunications Service (UMTS) Up to 2 Mbps Low as 4.0 sec
Geoport 2 Mbps 4.0 sec
E-1 2.048 Mbps 3.9 sec
T-1C (DS1C) 3.152 Mbps 2.5 sec
Token Ring/802.5 4 Mbps 2.0 sec
DS2/T-2 6.312 Mbps 1.2 sec
E-2 8.448 Mbps 0.9400 sec
Cable Modem Varies; about 10 Mbps 0.8000 sec
Ethernet 10 Mbps 0.8000 sec
USB 12 Mbps 0.6600 sec
IBM Token Ring/802.5 16 Mbps 0.5000 sec
SCSI 1 3 MBps 0.3300 sec
ECP/EPP parallel port 3 MBps 0.3300 sec
Sustained data transfer of 1 GB hard drive/PM 7500 3.2 MBps 0.3100 sec
IDE 3.3 to 16.7 MBps 0.3000 to 0.0600 sec
E-3 34.368 Mbps 0.2300 sec
SCSI 2 5 MBps 0.2000 sec
DS3/T-3 44.736 Mbps 0.1700 sec
HSSI Up to 53 Mbps Low as 0.15 sec
OC-1 51.84 Mbps 0.1400 sec
Sustained data read of Ultra Wide SCSI IBM 9GB HD 8.2 MBps 0.1220 sec
Fast SCSI 2 10 MBps 0.1000 sec
Fast Ethernet 100 Mbps 0.0800 sec
FDDI 100 Mbps 0.0800 sec
T-3D (DS3D) 135 Mbps 0.0590 sec
E4 139.264 Mbps 0.0570 sec
OC-3/STM-1 155.52 Mbps 0.0510 sec
Wide (SCSI 3) 20 MBps 0.0500 sec
Ultra (SCSI 3) 20 MBps 0.0500 sec
Ultra Wide (SCSI 3) 40 MBps 0.0250 sec
Firewire 50 MBps 0.0200 sec
E5 565.148 Mbps 0.0140 sec
Ultra 2 (U2W or SCSI 3) 80 MBps 0.0125 sec
OC-12/STM-4 622.08 Mbps 0.0120 sec
Rumored next version of Firewire 100 MBps 0.0100 sec
Ethernet 1 Gbps 0.0070 sec
Ultra 160/m (SCSI 3) 160 MBps 0.0062 sec
OC-24 1.244 Gbps 0.0060 sec
OC-48/STM-64 2.488 Gbps 0.0030 sec
SciNet 2.325 Gbps 0.0030 sec
Sytem Ram, Blue G3 800 MBps 0.0012 sec
OB-192/STM-64 10 Gbps 0.0007 sec
OC-256 14.271 Gbps 0.0005 sec
CPU to CPU, 500 MHz G4 8.0 GBps 0.0001 sec
3 1/2 drive ?? ??
5 1/4 drive ?? ??

P.S.
I haven't tried to give credit to all the sources but I should mention a lot
of the info did come from:
<http://www.whatis.com/Flat_Files/The_Speed_of/0,282006,,00.html>;
This site also explains (briefly) what each technology is used for.





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