SDSL is a high-speed internet service with equal upstream and downstream data rates, suitable for businesses and those requiring fast upload speeds. It requires a dedicated phone line and a special modem, and is more expensive than ADSL.
SDSL (Symmetric Digital Subscriber Line) is a high-speed Internet access service with corresponding 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. Typically, DSL service is asymmetrical (ADSL), with most of the bandwidth reserved for receiving data, not sending it.
Typically, SDSL is used by companies with Web, VPN, extranet or intranet presence needs. In these cases, the client server may be required to regularly upload large streams of data to the Internet. ADSL would be slow and inadequate for this purpose, as the bandwidth available for upload is typically less than 1 megabit per second (mbps). SDSL bandwidth can reach 7 Mbps in both directions.
An ISP that offers SDSL may offer different grades at varying prices. The faster the data rate, the more expensive the service. Usually, long-term contracts are required for the service, regardless of the degree chosen.
SDSL uses a digital frequency that travels over existing copper telephone lines to send and receive data. When using the telephone line for this service, telephone and fax services on that line must be suspended. Therefore, a second dedicated or additional line is typically required. It differs from ADSL, which “leaves room” for both standard analog telephone sets and a digital signal, so you can talk on the phone or use a fax machine while online.
This is an “always-on” service, which means that your computer is actively connected to the Internet every time it’s turned on. If the computer is always on, the Internet connection will always be active.
SDSL service requires a special modem, usually provided by your Internet service provider, and the equipment is often proprietary. The SDSL modem will probably require same vendor equipment in the LAN or common DSL chipset.
In addition to businesses, SDSL can also serve people who require fast upload speeds. Network sharing, for example, has become very popular and with it the need to upload programs and files, often large files. SDSL is a good choice for heavy network sharing, as long as the user has a second phone line to dedicate to the service or chooses to suspend phone services while online.
SDSL is not available in all areas and speeds may vary depending on the user’s physical distance from local hubs. The service is also more expensive than ADSL, but it’s worth the difference for those with demanding upstream needs.
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