Dialup UK Article - Introduction to Cable Modems
The modems have been used for ages in the history of the
internet. Modems are primary devices to connect to internet.
One of the most predominantly used modem in the developed
countries like United States, Canada and members of European
Union. Here, we try to put focus on this very useful and popular
device. Cable modem technology offers high-speed access to
the Internet and World Wide Web services.
In simple words, a Cable Modem is a modem that operates over
the ordinary cable TV network cables. In technical terms,
a cable modem is a special type of modem that is designed
to modulate a data signal over cable television infrastructure.
Hence, cable modems are primarily used to deliver broadband
Internet access with the aim of taking advantage of unused
bandwidth on a cable television network. After this explanation,
we must confess that the term "Cable Modem" is ambiguous.
This is because the cable modem works more like a Local Area
Network (LAN) interface than as a modem.
In terms of connection speed and range, a typical simple
modem connection can range from 25Kbps to about 50 Kbps. It
is used point-to-point technology. The distance is virtually
unlimited. This includes data transfer through multiple satellite
networks if necessary. On other end, a local area network
or LAN connection is 10 Mbps or 100 Mbps. It is used to connect
many computers at a very high speed and amount of data transfer
so that the terminal at a distance of a few hundred meters
can virtually "talk" to each other with servers
and printers at some time. A Cable Modem connection is something
in-between these two. The speed can range from 3 Mbps to 15
Mbps at times. The distance can be up to 50 Km to 100 km or
Under standard procedure, you just connect the Cable Modem
to the TV outlet for your cable TV and the cable TV operator
connects a Cable Modem Termination System (CMTS) in his Head
End. The end-to-end network architecture enables a user cable
modem to connect to a CMTS. The CMTS in turn connects to a
regional data center for access to Internet services. Thus,
through a system of network connections, a cable data network
is capable of connecting users to other users anywhere in
the global network. The Cable Modem Termination System (CMTS)
can talk to all the Cable Modems. However, the Cable Modems
can only talk to the CMTS. If two Cable Modems need to talk
to each other, the CMTS will have to relay the messages.
Cable modems integrates the elements necessary to progress
beyond standard modem technology and provide better internet
access with privacy, security and best quality service features.
The main advantage of the cable modem technology is that that
people who have cable TV can now also get a high-speed Internet
connection from their cable provider. The propagation of cable
modems has advanced the age of Internet access in the developed
countries. Today, cable modems compete with technologies like
digital subscriber lines (DSL) and asymmetrical digital subscriber
lines (ADSL) and has a great future ahead.