ADSL stands for Asymmetric Digital Subscriber Line. It is called "asymmetric" as it allows the fast movement of data from the telephone exchange to the customer than from the customer to the exchange. It is suitable in situations where it is expected to receive more data than they transmit. An example would be "surfing the internet", where more information is received than is sent. How does ADSL Work?The copper wires that are used to carry telephone lines into most homes and offices are capable of transmitting information at much higher speeds than is necessary to convey a telephone conversation. The extra bandwidth that the wire could support is wasted at the moment. ADSL is able to take advantage of the available bandwidth by using additional equipment to transfer data at a higher frequency than that used for voice calls. Sophisticated electronics are employed to cope with electrical noise on the line and to ensure that there is no interference between the voice and data sharing the line. The higher the frequency that is used to send a signal over a piece of wire, the faster the signal will degrade over distance. Because ADSL uses very high frequencies, there are limits over the distance that the signal can be reliably received. The 512K ADSL services have a maximum range of 6 km. Because of the higher bandwidth required, 2Mb ADSL services have a slightly smaller radius of 3.5km. Who is ADSL aimed at?ADSL service is aimed at consumers market, teleworkers and SME's. It offers a faster connection than conventional dial-up, but at a lower cost than a leased line Internet connection (a preferred connection for a high bandwidth requirement). What does RADSL mean?RADSL (Rate-Adaptive Digital Subscriber Line) is the very latest advancement in Broadband technology. It has been created to allow more customers to receive a 512K ADSL services by increasing the range of ADSL from 3.5km to 6km. (All 512K ADSL connections now use RADSL technology). The download speed available to customers using RADSL is still up to 512kbps, whilst the upload speed will vary between 64kbps and 256kbps. What does the term “Contention Ratio” mean? This is the sharing of available bandwidth between a pre-determined number of other users. Example, a contention of 20:1 means that you share the bandwidth with up to 19 other users, i.e; the performance of an ADSL connection will vary according to time of day and day of the week, depending on how many other users are online at the same time. The Contention ratios available with ADSL are either 50:1 or 20:1. The lower the contention ratio the better chance of reaching the optimum data transfer speeds. Is ADSL available to everyone?No. In order for customers to receive ADSL connection they must have a standard BT telephone line which is connected to an ADSL enabled local telephone exchange and is within 6km from the exchange. What is the difference between ADSL and Dial-up connection?ADSL offers far superior connection speeds and provides you with a 24/7 connection for a fixed monthly fee. At present the fastest access speeds available through standard dial connections are 56 Kbps for download and 48 Kbps for uploads. ADSL can provide speeds of up to 2 Mb for downloads and a maximum of 256 Kbps for uploads. As you are connected 24/7 you don’t have to wait to be connected before browsing the web. Can ADSL work on any telephone line?No, you can only receive ADSL if you are connected through a standard BT telephone line. Will I need to change my telephone number?No, because ADSL has been designed to use your existing BT telephone line, your telephone number remains the same. Will I still be able to make telephone calls through my ADSL line?Yes, with ADSL you will be able to make telephone calls even while you are accessing the Internet. Will I still need to pay for my telephone line rental and telephone calls?Yes, as ADSL only enables you to use the Internet without paying ongoing call charges to BT. You will still have to pay for voice telephone calls and line rental charged by BT.
There is a minimum contract period of 12 months when you sign
up with 21st Click Limited, should you wish to cancel
your 21st Click account after the minimum contract
period, you are require to give 30 days written notice. Once you have ordered a 21st Click Business Package your ADSL service will be available to you within approximately 14 working days. What is an IP Address?An IP (Internet Protocol) address, are numbers which identifies the exact position of a computer on the Internet, for example, 212.168.8.225. All equipment connected to the Internet has an IP address as it is the only way it can be found by other computers or servers trying to send it information. What is the difference between a Dynamic IP address and a Static IP Address?Having a dynamic IP address simply means each time you connect to the internet you receive a new IP address, whilst a Static address provides a range of fixed IP addresses. Is there a limit on the amount of data I can download or upload?No, there are no limits on the amount of data you can upload or download. Your only restriction is the Upload and Download speed of the ADSL connection you have chosen.
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