|Ok, So What is Bandwidth?
Bandwidth is the amount of data that can be transmitted via a given communications
channel (such as a computer network) in a given unit of time (generally
does that mean? It means that all internet connections are limited to a
certain amount of data transfers over time. For example, if you try to
download too many files at once, your internet connection becomes lagged.
Why? Because the speed of your dialup connection (assuming you are on a
dialup) cannot handle transferring that amount of data at once. If
you upgraded to a higher bandwidth connection, ie: a cable modem, then
you would be able to download more files before becoming lagged.
How Is Bandwidth Measured?
connections to the internet are limited in the same way. We measure dialups
by kilobytes per second (Kbps), thus 14.4k, 28.8k, 33.6k, 56k, 64k, 128k.
A kilobyte is a measurement of storage capacity equal to approximately
1024 bytes. We measure other connections in megabits per second (mbps).
A megabit is a measurement of storage capacity equal to approximately 1
million bits (1,048,576).
What Is a Hop and a Backbone?
backbone is a high-speed, high-capacity medium designed to transfer data
over thousands of miles. The internet is made of an enormous system of
hop is the path that data travels from one router to the next. A
router is an electronic device that examines each packet of data it receives
and then decides which way to send it onward toward its destination.
So that the data can reach the backbone, several hops may be necessary.
require processing time. When the message must be read and passed on by
several routers before it reaches its destination it can result in jitter.
Jitter is an annoying and perceptible variation in the time it takes various
"workstations" to respond to messages. Some respond quickly, while some
What Does All of This Mean
you are looking at buying a shell you need to know its bandwidth and possibly
how many hops it is from its backbone connection. Now you know what the
measurements mean, what a backbone is, and what hops mean. Let's move on
the the different types of connections and their speeds.
you either understand or don't care about dialup, ISDN, ASDL, or Cable
connections, skip to here.
Dedicated or Non-Dedicated?
"unlimited" internet account is not the same as a dedicated connection.
A dedicated connection means that someone is paying their provider to keep
them connected 24 hours a day, 7 days a week. An unlimited internet account
generally does not include "idle" time and many internet service providers
will disconnect dialup accounts after a certain length of time (sometimes
whether idle or not). A dedicated connection however allows a system to
connect to their internet service provider continuously whether idle or
not, with no time constraints.
Connections are connections that are established when a user calls into
the system that connects them to the backbone and then to the internet.
Ok, So What Are all these
28.8K, 33.6K, 56K
Signal. 64 kbps
SDN Connections are also a type of dialup, however they use digital lines
as opposed to analog lines and are much faster.
Digital Line. These use regular copper lines for a faster connection. 512
kbps to 6.1 mbps
||This is a connection to
the internet via the same cable lines that you would get cable television
through. The actual bandwidth for Internet service over a cable TV line
is up to 27 mbps on the download path to the subscriber with about 2.5
mbps of bandwidth for interactive responses in the other direction. However,
since the local provider may not be connected to the Internet on
a line faster than a T-1 at 1.5 mpbs, a more likely data rate will be close
to 1.5 bpbs, although some cable subscribers have been known to get up
mbps (equivalent of quite a few ISDN lines)
very high speed North American, dedicated phone connection, costing generally
$750-$1500 per month. Normally it is used to connect internet access providers
or other internet businesses to nodes. 1.544 mbps
Signal. 1.544 mbps
Tributary 1.728 mbps
European connection. 2.048 mbps
Tributary 2.304 mbps
Tributary 6.912 mbps
is also a European connection. 34.368 mbps
Digital Signal. 44.736 mbps
can vary. up to 44.736 mbps (depending on the type of T3)
Carrier 51.84 mbps
Transfer Signal 51.84 mbps
connection. 139.264 mbps
Carrier 155.52 mbps
Transfer Module 155.56 mbps
Transfer Signal 155.56 mbps
Carrier 622.08 mbps
Transfer Module 622.08 mbps
Transfer Signal 622.08 mbps
Link (approximately $1.5 million per month)
If you are wondering why 1 kilobyte isnt equal to 1,000 bytes and one megabyte
isnt equal to one million bytes, here is your answer. The computer
world is based on twos, not tens. Two to the tenth power equals 1024. Because
one byte is the same as one character in personal computing, 1K of data
can contain 1024 characters. Want to know the difference between a byte
and a bit? Eight bits make a byte :)