Internet Connection Types - Internet & World Wide Web, E-Commerce Video Lecture | E-Commerce - B Com

one of the more popular internet
connection types these days is on a
cable modem this is a network that
originally was a video network but we
were able to use those same coax lines
to run data communication using these
cable modems this uses a standard called
DOCSIS doxa stands for data over cable
service interface specification it
allows us to send data over these
networks anywhere from 4 megabits
through 250 megabits and even higher
with the newer DOCSIS standards we often
will see data video and voice
communication running over these cable
modem networks another popular internet
connection type is one that also used a
set of existing wires that was coming
into our businesses and into our homes
this is dsl or more specifically a dsl
asymmetric digital subscriber lines it
uses the existing telephone lines that
are coming into our homes and the reason
it's asymmetric is because the download
speed on these networks is usually
faster than the upload speed and so
therefore it's not a symmetric or
identical amount of speeds it's
asymmetric usually there is a distance
limitation to these networks generally
it's somewhere around 10,000 foot
limitation from the central office if
your wiring is going to go farther than
that to your home you may not be able to
have dsl service these days we generally
see speeds for DSL that's 24 megabit
down and 3.3 megabit upstream but there
are other standards along these lines
that will increase the speeds even
further one of these is V DSL or very
high bitrate DSL where you can get a
three megabit through 100 megabit
download speeds before we had DSL we
were running our network communications
over those phone lines using a dial-up
configuration these allowed us to take
the same connections we were using for
voice and instead send digital signals
over these networks the speeds however
relatively small you had 56 kilobits but
with compression you could sometimes get
a throughput that approached 320
kilobits per second so obviously this is
relatively slow when you compare it to
the megabit speeds that you get with DSL
or cable modem configurations and
because this is
just slow throughput and we had to have
a separate phone line for every
connection it did not scale very well
however if you're in a location that
doesn't have a cable modem it doesn't
have dsl connectivity and you need to
transfer just a little bit of
information during the day this may be
useful to have especially on legacy
systems that were designed around these
dial-up networks the latest trend in
Internet connectivity is to bring the
fiber directly to you so will connect to
your home or your business directly
allowing you to run internet connections
voice communication and video over this
single fiber optic connection and the
speeds for fiber optic are much improved
over these older technologies you
generally get 100 or more HD channels
there can be one gigabit per second
internet access with a terabyte of cloud
storage and two terabyte DVRs because
you have so much bandwidth available you
really have a larger number of services
that are now available to you there may
be some cases where you don't have
access to a cable modem network you're
too far to run DSL and maybe a phone
line communication is just too slow so
in those cases you might want to
consider using a satellite network this
is a non terrestrial communication you
are communicating directly to a
satellite and then back down to earth to
be able to have internet connectivity
this obviously is a little more
expensive than a cable modem or a DSL
connection but you still get pretty good
speeds these days you can get about 15
megabits down and 2 megabits up when
you're working on a satellite network
because you're going all the way up to
space and back down again however you
generally have high latency so you'll
see that the latency just to go up to
the satellite is about 250 milliseconds
and another 250 milliseconds to come
back down so it's half a second every
time you send information back and forth
over this non terrestrial link so you
want to be sure the applications you're
using can tolerate this much slower
network communication these connections
between the ground station and the
satellite itself are usually running
frequencies in the two gigahertz range
this works over a line of sight
communication and it's very sensitive to
anything that might be in the way if you
have rain that's coming through you may
have what we call rain fade that
early disrupts the communication link
between the ground and the satellite
another type of niche networking would
be is TM the stands for integrated
services Digital Network you often see
ISDN packaged and delivered in two
different ways one called a basic rate
interface or a Bri you may see this
described as two B plus D the B channels
are called bearer channels these are the
channels that are actually sending the
data through the network and with Bri
you get to 64 kilobit bearer channels
you also have one channel that is the
signaling channel or the management
channel for ISDN and for Bri there is
one sixteen kilobit D Channel the other
type of ISDN is called PRI or primary
rate interface this is one that is
usually delivered over a t1 or e1 leased
line this is something on a t1 where
you're getting 23 bearer channels and
one of the channels is set up as that D
channel for control in an e1 which is
usually seen in Europe we have 30 bearer
channels one single D Channel and a
separate alarm channel these days we
don't generally see is d n being used in
a home we usually have a DSL or cable
modem or even fibre to our homes but in
larger organizations where you have a
lot of legacy phone systems you may
still see a number of ISDN PRI
connections coming into those
environments these days we're familiar
with our mobile devices and being able
to communicate from wherever we happen
to be we often call these cell phones
this goes back to the original
configuration of our mobile networks
where plots of land were separated into
cells we then placed antennas and very
strategic points so that we could cover
all of those different cells of land
these days a number of our mobile
devices can even be used as a wireless
router we can enable a functionality
called tethering that turns on your
mobile device as a central point for
multiple devices to communicate over
these cellular networks another device
that works very similarly is a mobile
hotspot this is a device that looks like
a normal wireless network to all of your
devices but it's using this cellular
network to communicate out to the
Internet
another popular type of network
communication is one that uses
line-of-sight with
line-of-site there's usually a central
antenna it's usually very high and at a
central point and everybody has
individual antennas at their house or
their business that are able to see and
communicate directly to this central
antenna this is very common to see in
very populous areas that need high-speed
communication and it's easy to have a
central antenna that everyone can
communicate with there are also options
for lower bandwidths especially if
you're not able to get an exact
line-of-sight to these types of networks
it's very common to see this was
something called WiMAX
this is worldwide interoperability for
microwave access it uses very high
frequencies to communicate over this
line-of-sight network to provide some
very high-speed Internet connectivity
you