DSLlinjoja

DSLlinjoja are digital subscriber line connections that provide broadband access over existing copper telephone lines. They rely on separating high-frequency data signals from the voice channel, allowing users to make telephone calls while online. The service is enabled by a network element known as a DSLAM (digital subscriber line access multiplexer) at the telecommunications provider's side and a customer premises equipment such as a modem or gateway at the user end. A splitter or filter is typically installed to keep voice traffic on the telephone line free from data signals.

The DSL family includes several standards, among them ADSL, ADSL2+, VDSL and VDSL2, and the short-range G.fast. ADSL and ADSL2+ generally provide higher downstream speeds than upstream, with typical commercial offerings ranging from a few to a couple of tens of Mbps. VDSL and VDSL2 deliver higher speeds over shorter copper distances, often reaching tens or hundreds of Mbps, while G.fast aims at gigabit performance over very short lines. Actual experience depends mainly on distance from the DSLAM, line quality, and crosstalk between lines.

In deployment, the provider places the DSLAM in a central office or street cabinet, and the customer connects through a modem or router. Splitters or microfilters separate voice service from data to preserve traditional telephone use. DSLlinjoja are relatively inexpensive to deploy on existing copper networks and are commonly used where fiber is not yet available, or to extend broadband coverage to rural areas; however, their speed and reliability are generally lower and more distance-sensitive than fiber or fixed wireless alternatives.