NetworkingNetworking

Types of Internet ConnectionTypes of Internet Connection

http://www.bbc.co.uk/news/technology-11864350

Dial-upDial-up

► Slowest and (usually) the most inexpensive. Slowest and (usually) the most inexpensive. ► Allows you to connect to the internet using a Allows you to connect to the internet using a

standard 56k modem (56 Kbps). Your standard 56k modem (56 Kbps). Your computer literally dials a phone number and computer literally dials a phone number and connects to your ISP server. connects to your ISP server.

Advantages of Dial-upAdvantages of Dial-up

► Can be economic - the cost is per minute. Can be economic - the cost is per minute. ►widely availablewidely available► hardware costs are minimal.hardware costs are minimal.► You only need a standard phone line. You only need a standard phone line.

Disadvantages of Dial-upDisadvantages of Dial-up

► Slow compared to other connection types.Slow compared to other connection types.►when connected to the internet the same when connected to the internet the same

phone line cannot be used for phone calls.phone line cannot be used for phone calls.

ADSL (Asymmetric Digital ADSL (Asymmetric Digital Subscriber Line)Subscriber Line)

►Works by splitting your phone line Works by splitting your phone line into two separate channels, one for into two separate channels, one for data and one for voice, therefore, data and one for voice, therefore, you can be on the phone and the you can be on the phone and the internet at the same time. internet at the same time.

►Charge flat monthly fee – Charge flat monthly fee – ►Usually between 2 & 25Usually between 2 & 25MbpsMbps

ADSL - AdvantagesADSL - Advantages

►Very fast download speedsVery fast download speeds►Transfers data digitally, therefore no Transfers data digitally, therefore no

need to translate data from analogue need to translate data from analogue to digital and vice versa.to digital and vice versa.

►ADSL connections are always on – no ADSL connections are always on – no connection time.connection time.

ADSL - DisadvantagesADSL - Disadvantages

►Not available to everyone, need ADSL Not available to everyone, need ADSL coverage in your area.coverage in your area.

►Hardware costs are higherHardware costs are higher

Cable modem Cable modem

► One of the best types One of the best types of internet of internet connection available connection available to the home user, to the home user, very fast and reliable very fast and reliable connections with a connections with a fixed monthly fee. fixed monthly fee. Uses Fibre Optic Uses Fibre Optic Cable to deliver Cable to deliver television channels television channels and Internet i.e. NTLand Internet i.e. NTL

Cable modem - AdvantagesCable modem - Advantages

►Very fast download speeds – Very fast download speeds – theoretical maximum of 36Mbpstheoretical maximum of 36Mbps

►Like ADSL connections, cable Like ADSL connections, cable connections transfer data digitally, connections transfer data digitally, eliminating conversion overhead. eliminating conversion overhead.

►Like ADSL, connections are Always on. Like ADSL, connections are Always on.

Cable modem - Cable modem - DisadvantagesDisadvantages

►Cable connections are not available in Cable connections are not available in every area. every area.

ISDN (Integrated Services ISDN (Integrated Services Digital Network)Digital Network)

►Provides two high speed lines each Provides two high speed lines each capable of running at 64Kbps capable of running at 64Kbps (128Kbps) through existing phone (128Kbps) through existing phone networknetwork

►Transfers data digitally.Transfers data digitally.

ISDN - AdvantagesISDN - Advantages

►Two phone lines – can be invaluable to Two phone lines – can be invaluable to a small businessa small business

► ISDN may be available in areas where ISDN may be available in areas where ADSL is not.ADSL is not.

ISDN - DisadvantagesISDN - Disadvantages

►Additional hardware required – ISDN Additional hardware required – ISDN cardcard

►Expensive compared with other types Expensive compared with other types of connectionof connection

Leased LineLeased Line

►A dedicated data line that connects A dedicated data line that connects companies to the internet. The user companies to the internet. The user will have exclusive access to the will have exclusive access to the leased line, meaning a guaranteed leased line, meaning a guaranteed level of quality and speed – 1.5 to level of quality and speed – 1.5 to 274 Mbps274 Mbps

►Can be used to link two Can be used to link two geographically distant arms of the geographically distant arms of the same business and are always same business and are always activeactive. .

Leased Line - AdvantagesLeased Line - Advantages

►Dedicated line – fast access and data Dedicated line – fast access and data transfertransfer

►Secure connection – only one user Secure connection – only one user

Leased Line - DisadvantagesLeased Line - Disadvantages

►ExpensiveExpensive

BroadbandBroadband

►DO NOT USE THE TERM DO NOT USE THE TERM ‘BROADBAND’ IN ANY EXAM ‘BROADBAND’ IN ANY EXAM ANSWERANSWER

BandwidthBandwidth

►This describes the amount of data that This describes the amount of data that can be transferredcan be transferred

►Measured in bps (bits per second)Measured in bps (bits per second)