DSL (Digital Subscriber Line) means a wideband high-bit-rate link transmitted through basic phone lines with unreserved bandwidth in 3100 hz typical for dial-up channel. DSL modems transmit data in a digital form and in contrast with traditional analogue equipment omit digital-analog conversion during data receiving.
DSL technology upgrades bandwidth of old copper phone lines connected stations with individual customers increasing connection speed, providing round-the-clock net access and ordinary phoneline operation.
Benefits of DSL connection
- Phone and internet connectivity can be operated simultaneously. In order to provide this possibility, DSL divides high-frequency bands on the client and provider sides using splitters.
- Supplied bandwidth is higher than standard modem provides.
- DSL does not require new-made wiring using available dial line and established infrastructure.
- DSL company ordinarily offers modems for free simplifying installation process.
Downsides of DSL technology
- Your geographical location has a cardinal impact to speed the shorter distance lay between you and provider’s central office, the more reliable DSL performance is.
- Channel linkage rate depends on the main network usage. It performs best results receiving information rather than forwarding data over the Internet.
- Services availabilities do not cover all internet area.
Types of DSL
- Asymmetrical DSL (ADSL) is the most popular mechanism among home users and junior enterprises. In dependence of the download speed exceeds three and more times uploading process, ADSL splits convenient frequencies on the chain and provides benefits for a customer in the form of extra time.
- Very high bit-rate DSL (VDSL) provides extremely fast connection but on a small distance only.
- Symmetric DSL (SDSL) is used by junior companies and does not admit phone and the Internet usage at the same time, but performs similar speeds of receiving and sending data.
- Rate-adaptive DSL (RADSL) is an ADSL version characterized by connection speed control under the modem operating and based on length and quality of the line.
In order to provide DSL operation, both participants use special equipment: first one is responsible for users’ connection; another receives signals from internet provider side.
DSL transceiver, also called as DSL modem, delivers data from user’s computer or network to DSL chain.
DSL Access Multiplexer is a provider’s mechanism connected client DSL links to a single high-speed channel. When provider receives a DSL signal, an ADSL modem catches data and transmits it to DSLAM, where it passes to the Internet. It’s obvious that more DSLAMs provider companies have, the more customers they support.