ADSL is a digital communication technology that allows for fast data transfer over telephone lines. An ADSL jack is a cable connection point on a computer or wireless networking hub, or a filter jack needed to split signals. A filtering ADSL jack is necessary to remove data rate interference. ADSL is more suitable for home use due to higher download than upload speeds.
An asymmetric digital subscriber line (ADSL) is a digital communications technology that allows for rapid data transfer over standard telephone lines. An ADSL jack can refer to the cable connection point on a computer or wireless networking hub, or the filter jack needed to split signals received through a telephone line into voice call and data transfer signals. ADSL technology achieves speeds faster than those provided by standard modem connections by using unused frequencies in the telephone line to speed up packet transfers.
In reference to direct computer connections and wireless network hub connections, an ADSL jack is the port to which an ADSL data cable is connected. ADSL cable can transfer data by extending the telephone cord connection between a wall jack and the receiving device. An ADSL cable can also be used to connect directly between an ADSL out port on a wireless network hub and an ADSL jack on a computer if needed.
Because the technology uses the unused frequencies on a standard telephone line to transfer data, it is necessary to install a splitter or filtering ADSL jack directly at the telephone connection point on the wall. A voice line will pick up all frequencies on a line and therefore also pick up interference from data signals if this filter is not installed. Filter plugs are usually provided free of charge by an Internet Service Provider (ISP), but additional plugs can be purchased if needed. It is generally recommended that a filtering ADSL outlet be used for each voice telephone connection in a home to filter out data rate interference.
The filtering ADSL jack is a single input to dual output splitter device that contains a simple low-pass frequency filter in the voice line output jack. This filter removes data frequencies from the voice line but allows all frequencies to pass through the ADSL cable connection. A digital subscriber line (DSL) device, such as a wireless hub, is designed to filter low frequencies from the received signal, and therefore, no microfiltration device is needed at this output.
There are other DSL services, but ADSL is the most commonly used type of home connection. An ADSL connection is more suitable for home use due to the higher bandwidth provided in the receive or download direction than in the outgoing or upload signal. This discrepancy in bandwidths provides the asymmetric characteristic indicated in the name of the technology. Business users often require faster upload speeds and therefore will need to invest in a more balanced DSL service or pay for a leased phone line.
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