Explain ADSL With Advantages & Disadvantages
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ADSL (Asymmetric Digital Subscriber Line)
What is ADSL?
Providing bandwidth is expensive – it needs special equipment at the exchanges and your telephone line has to be of good quality .
Telephone companies realised that most domestic customers would be downloading far more than they would be uploading. And so it made sense to develop a DSL technology that provided fast download speeds but slower upload speeds.
This service is called Asymmetric Digital Subscriber Line (ADSL) otherwise known ‘Broadband’.
Providing bandwidth is expensive – it needs special equipment at the exchanges and your telephone line has to be of good quality .
Telephone companies realised that most domestic customers would be downloading far more than they would be uploading. And so it made sense to develop a DSL technology that provided fast download speeds but slower upload speeds.
This service is called Asymmetric Digital Subscriber Line (ADSL) otherwise known ‘Broadband’.
Advantages of ADSL
Faster downloads compared to dial-up or ISDN
No need for a second phone line - by allowing voice and data transfer at the same time (you can use the phone as normal while connected to the internet).
Because ADSL transfers data digitally it doesn't need to convert the data from digital to analogue and back again.
ADSL connections are Always on, which makes the usual long wait to connect a thing of the past.
Disadvantages of ADSL
ADSL connections are not available to everyone, you need to be within 3 miles of an ADSL enabled exchange.
The hardware costs can be quite significant as you will need a special ADSL modem and ADSL filters to use the service, most ISPs allow you to hire these items which can reduce the initial cost.
Because ADSL connections are Always on you will need a firewall to protect your PC