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DSL (Digital Subscriber Line)

DSL (Digital Subscriber Line) is a technology used to transmit digital data over telephone lines. The term DSL usually refers to ADSL (Asymmetric Digital Subscriber Line) a technology that enables digital data transmission over copper telephone lines.

The bit rate of consumer DSL services typically ranges from 256 Kbit/s to over 100 Mbit/s but actual speeds vary depending on the quality of the copper phone line installation. The length of the phone line needed to reach the service provider's equipment (sometimes called the "central office") also can limit the maximum speed a DSL installation supports.

High frequency riding on top of low frequency

DSL service can be transmitted simultaneously with voice band telephone service on the same line because DSL uses a much higher frequency that rides on top of the low 3400 Hz voiceband. A telephone outlet blocks the high digital data frequency to enable simultaneous use of the voice and DSL services.

DSL has been a common type of Internet service for many years, but the experience of individual customers can vary greatly depending on their location, their provider, the quality of telephone wiring in their residence and some other factors.

VDSL (Very-high-bit-rate Digital Subscriber Line) which is available when the site has fiber-optic cabling and allows speeds up to 52 Mbit/s and 16 Mbit/s and can be used for HDTV.

More Networking Protocols and Standards:
• OSPF (Open Shortest Path First) Protocol
• A Simple Description of the IPv6 Header and Datagram
• The OSI Session Layer
• Introducing OpenStack
• IEEE 802 Standards Specify the Basics of Physical and Logical Networking
• What is PPP, PPPoA and PPPoE?
• IP Addressing
• Classless IP Addressing
• Major Protocols in the TCP/IP Suite
• The OSI Application Layer

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