What is SDSL?
SDSL stands for ‘Symmetric Digital Subscriber Line’ and provides fast access internet service using existing copper telephone links. By installing SDSL, you can take advantage of high speed internet access through an ‘always on’ service making it much easier to download information from the internet or to share information between offices or remote workers. SDSL services are symmetrical – which means that data can be uploaded as fast as it can be downloaded.
Symmetric DSL offers balanced upload and download data rates more suitable for businesses that send as much data as they receive. SDSL uses the portion of the frequency spectrum usually occupied by telephone voice traffic. This means that the two services cannot coexist on the same circuit – and thus there is no need for a microfilter. As befits a more business-orientated connection method, SDSL services generally offer lower contention ratios than ADSL. The roll out of SDSL in the UK has been very slow and it is still subject to limited availability. With ADSL2+ offering even higher performance, and leased line and ethernet prices coming down in the major cities, SDSL services may continue to be of limited utility.
SDSL (Symmetric Digital Subscriber Line) is a technology for transmitting digital information at high bandwidths on telephone lines to homes and businesses. Unlike regular dial-up telephone services, SDSL provides a continuously available connection. SDSL is symmetrical in that it evenly divides the channel to transmit data upstream and downstream to the user at the same speed. SDSL does not accommodate simultaneous analog (voice) information on the same line. SDSL service is capable of symmetrical speeds ranging up to 1.5 Mbps in both directions. Access Point currently does not offer SDSL service but has other products to fill this need. Contact our Customer Service Department to discuss our available options.
• Send and receive large files • Need to connect from remote sites via VPN • Video conference • Host email servers and websites • Transfer large files to remote backup locations • Make phone calls over the Internet Unlike standard ADSL broadband, upload and download speeds are the same (symmetric) with SDSL. SDSL is only available as a business product. Please see the SDSL product page for more information. [Top] 2. Why choose SDSL instead of a leased line? SDSL is much cheaper than leased line alternatives, also known as private circuits. You simply pay a flat monthly subscription, with no additional charges. Leased lines are also very expensive to reinstall if you move premises, unlike SDSL – see Q10. [Top] 3. What SDSL speeds are available? PlusNet SDSL is available at speeds of 250k, 500k, 1Mb and 2Mb. Speeds apply to both uploading and downloading. Line speed depends on the length of the cable to your local telephone exchange – the shorter the cable, the faster the connection.
SDSL (Symmetric Digital Subscriber Line) is high-speed Internet access service with matching upstream and downstream data rates. That is, data can be sent to the Internet from the client machine or received from the Internet with equal bandwidth availability in both directions. Normally, DSL service is asymmetrical (ADSL), with the bulk of the bandwidth reserved for receiving data, not sending it. SDSL is normally used by businesses with a Web presence, VPN, extranet or intranet needs. In these cases the client server may be required to upload large streams of data to the Internet on a regular basis. ADSL would be slow and inadequate for this purpose, as the bandwidth available for uploading is normally less than 1 megabit per second (mbps). SDSL bandwidth can be as high as 7 mbps in both directions. An Internet service provider offering SDSL may offer different grades for varying prices. The faster the data rate, the more expensive the service. Usually, long-term contracts are require
