Glossary.

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D
Data rate

The data (transmission) rate, colloquially also called the transmission speed, describes the quantity of digital data which can be transmitted within a unit of time. It is measured in bps (bits per second).

DECT (Digital Enhanced Cordless Telecommunications)

DECT is a standard for wireless transmission of voice and multimedia data between a base station and up to eight end-devices. This standard ensures high voice quality.

Dematerialization

This term means the replacement of material things with immaterial things – e.g., paper invoices with online invoices).

Dematerialization

Dematerialization  refers to the replacement of tangible products such as letters, photographic prints and CDs with digital files.

Digital divide

The term refers to a situation in which people do not have the same degree of access to modern digital information and communications technologies (ICT) and, for this reason, do not have the same opportunities for social and economic development. As a leading ICT enterprise, Deutsche Telekom sees itself responsible for giving people within its sphere of influence broad access to ICT and, in this way, for preventing inequality.

Digitale dividend

The expression „digital dividend" refers to the increase in transmission capacity that is achieved by changing over to digital technology. In the course of digitizing TV and radio broadcasts (DVB-T), signals will be transmitted in future over one frequency or one channel. This will free up valuable frequency bands - used to date solely for the transmission of analog signals - for the broadband Internet service.

DJSI (Dow Jones Sustainability Indexes)

Launched in 1999, the Dow Jones Sustainability Indexes (DJSI) are the leading global stock market indexes for sustainable capital investment. They measure and track the sustainability performance of companies. In cooperation with the Dow Jones Indexes, the STOXX Limited index for renewable energy, and ratings agency Sustainability Asset Management (SAM), they provide asset managers with important benchmarks to establish and manage sustainability portfolios. More than 300 companies are listed in the DJSI.

Double play products

Double play means that telephony and Internet can both be used via a single access. Deutsche Telekom's Call & Surf rate plans are examples of this.

Download

Refers to the downloading of files from a remote server over networks such as the Internet or mobile communications connections onto a local computer or other client, such as a cell phone.

Downstream

Downstream  is data transmission from the Internet to the user's computer. Files are also downloaded this way.

DSL (Digital Subscriber Line)

In Deutsche Telekom's service portfolio as:

  • ADSL (Asymmetrical Digital Subscriber Line): Technology used to transmit data at fast rates (between 16 kbit/s and 640 kbit/s upstream; up to 8 Mbit/s downstream) via standard copper wire pairs within the local loop within a radius of approximately three kilometers.
  • ADSL2+: Successor product to ADSL that raises the maximum data rate to 16 Mbit/s (downstream) or 1 Mbit/s (upstream).
  • VDSL  (Very high bit rate Digital Subscriber Line) is a new technology used to transmit exceptionally high data rates (5 Mbit/s upstream, 50 Mbit/s downstream) via a fiber-optic network.
DSLAM port

A DSLAM (Digital Subscriber Line Access Multiplexer) is typically an exchange that connects DSL lines. The DSLAM collects DSL data traffic to be transmitted to customers on a local level and, on the other side, establishes the connection to a regional broadband access server. Each individual outlet to a subscriber is referred to as a port. Each port is comprised of a transmission unit and a splitter.