Topic filter




  • 4G

    Refers to the fourth-generation mobile communications standard (see LTE).


  • 5G

    Refers to the mobile communications standard launched in 2020, which offers data rates in the gigabit range, mainly over the 3.6 GHz and 2.1 GHz bands, converges fixed-network and mobile communications, and supports the Internet of Things.


  • 6G

    The next-generation mobile communications standard, likely to use terahertz spectrum (0.11 THz to 0.17 THz) to offer increased capacities and lower latency. 6G is expected to launch commercially in 2030 and is being developed as a response to the increasingly distributed Radio Access Network (RAN).


  • AI – Artificial Intelligence

    Describes the ability of a machine or software to imitate human capabilities, such as logical thinking, learning, planning, and creativity. Generative Artificial Intelligence (also known as GenAI) – as a branch of artificial intelligence – is used to generate new content, such as text, images, music, or videos.

  • AL – After Leases

    Since the start of the 2019 financial year, we have taken the effects of the first-time application of IFRS 16 “Leases” into account when determining our financial performance indicators. “EBITDA after leases” (EBITDA AL) is calculated by adjusting EBITDA for depreciation of the right-of-use assets and for interest expenses on recognized lease liabilities. When determining “free cash flow after leases” (free cash flow AL), free cash flow is adjusted for the repayment of lease liabilities.

  • API – Application Programming Interface

    A program component which is made available by a software system for other programs to connect with it.

  • AR – Augmented Reality

    The computer-generated enhancement of the real world with perceptual information. The information can address all the human senses. However, augmented reality often only encompasses the visual representation of information, i.e., the augmenting of images or videos with additional computer-generated information or virtual objects using overlaying/superimposition.

  • All IP – All Internet Protocol

    An all-IP network makes services such as VoIP (Voice over IP), IPTV (Internet Protocol Television), data transfer, etc. available to all users anywhere at all times. The data is transmitted in switched packets using the Internet Protocol (IP).


  • CDP

    An initiative by institutional investors that aims to promote dialog between investors and companies on climate change issues. The project counts the world’s largest companies among its members. The companies disclose data on their greenhouse gas emissions and climate protection strategies. The CDP collects and publishes the data on an annual basis.

  • Carrier

    A telecommunications network operator.

  • Cloud computing

    Refers to the dynamic provision of infrastructure, software, or platform services online. Apart from a high level of automation and virtualization, the services provided have to be multi-client-capable and include standardized hardware and software. Customers source these services on demand and pay based on actual usage. The communication infrastructure may be the internet (public cloud), a corporate network (private cloud), or a mix of the two (hybrid cloud). Dynamic Services is a T-Systems product for the flexible procurement of ICT resources and services.

  • Cybersecurity

    Security against internet crime.


  • E2E – End-to-End

    Meaning from beginning to end, e.g., from the customer through systems, to the organization, and back to the customer. An action on the part of the customer must result in a response (to the customer).

  • ERP – Enterprise Resource Planning

    Refers to systems that help deploy an organization’s resources such as capital, equipment, and human resources as efficiently as possible in order to optimize business processes.

  • Edge Computing

    Computing at the edge of the mobile communications network – not in remote data centers, but close to the customer, in the edge cloud. Edge computing opens up new applications: Anything that requires the rapid processing of large amounts of data, low latency and particularly strong security, such as augmented reality games.


  • FMC – Fixed-Mobile Convergence

    The merging of fixed-network and mobile rate plans for customers that have both fixed-network and mobile contracts with Deutsche Telekom.

  • FTTB – Fiber To The Building / Fiber To The Basement

    In telecommunications, FTTB means that the fiber-optic cable is terminated in the user’s house (basement).

  • FTTC – Fiber To The Curb

    In the FTTC architecture the fiber-optic cable is not terminated inside users’ homes (see FTTH) but in a cable distribution box (gray street cabinet). Existing copper technology is used for the last section of the connection to the user.

  • FTTH – Fiber To The Home

    In telecommunications FTTH means that the fiber-optic cable is terminated right in the user’s home or apartment.

  • FTTx

    This includes the three options for fiber-optic rollout: FTTB, FTTC, and FTTH.

  • Fairphone

    Fairphone is the first smartphone manufacturer to receive the Fairtrade certificate for the gold used in its devices. Fairphone sources rare minerals from conflict-free mining areas and continually monitors the working conditions along its supply chain. The Fairphone is also designed for longevity and easy repair, making it a particularly low-waste device.

  • Fiber-optic lines

    Sum of all FTTx access lines (e.g., FTTC/VDSL, vectoring, and FTTH).

  • Fixed-network lines

    Lines in operation excluding internal use and public telecommunications, including IP-based lines. The totals reported in the combined management report were calculated on the basis of precise figures and rounded to millions or thousands. Percentages were calculated on the basis of the figures shown.


  • GHG Protocol

    The Greenhouse Gas (GHG) Protocol divides emissions of greenhouse gases into the categories of Scope 1, Scope 2, and Scope 3, depending on their source.

    • Scope 1 includes all emissions directly generated in the Company, e.g., as a result of the consumption of fuel or fuel oil.
    • Scope 2 covers all indirect emissions associated with the generation of energy purchased by the Company from external sources, e.g., electricity and district heating.
    • Scope 3 applies to all other emissions generated along the corporate value chain. This comprises both indirect emissions in the company itself (e.g., business trips, commuting), and emissions from upstream value chain stages (e.g., procurement, logistics) and downstream stages (e.g., during customer use of products and services, during disposal).


  • HAPS – High Altitude Platform Systems

    HAPS is a complementary concept to terrestrial networks exploiting base stations on flying platforms in the stratosphere at an altitude from 18 to 22 kilometers. It extends the coverage and capacity for mobile networks.

  • Hybrid router

    Routers that are able to combine the customer’s fixed and mobile bandwidths.

  • Hyper-personalization

    Hyper-personalization is the use of real-time data and artificial intelligence to offer products, services, and content targeted to the specific needs of the customer, who uses a wide array of smartphones, laptops, tablets, and other devices to transmit data.


  • ICT – Information and Communication Technology

    Information and Communication Technology

  • IP – Internet Protocol

    Non-proprietary transport protocol in Layer 3 of the OSI reference model for inter-network communications.

  • IPTV – Internet Protocol Television

    Refers to the digital transfer of television programs and films over a digital data network using the Internet Protocol (IP).

  • IoT – Internet of Things

    The IoT enables the intelligent networking of things like sensors, devices, machines, vehicles, etc., with the aim of automating applications and decision-making processes. Deutsche Telekom’s IoT portfolio ranges from SIM cards and flexible data rate plans to IoT platforms in the cloud and complete solutions from a single source.


  • LTE – Long-Term Evolution

    4G mobile communications technology that uses, for example, wireless spectrum on the 800 MHz band freed up by the digitalization of television. Powerful TV frequencies enable large areas to be covered with far fewer radio masts. LTE supports speeds of over 100 Mbit/s downstream and 50 Mbit/s upstream.

  • Latency

    Latency, or response time, describes the time period between the occurrence of an event and the appearance of a visible reaction to it. In telecommunications, latency limits are governed by the laws of physics – as a function of the length of the pathway that the data need to travel through the networks. One example of this is mobile virtual-reality experiences. Anyone experiencing a virtual world while wearing VR goggles will need to receive something back from a remote server: namely an image that corresponds to the virtual explorer’s expectations. The rule of thumb is quite simple: The shorter the delay, the more realistic the user’s experience of the virtual worlds is likely to feel. The same goes for online gaming.


  • M2M – Machine to Machine

    Communication between machines. The information is automatically sent to the recipient. For example, in an emergency, alarm systems automatically send a signal to security or the police.

  • MPLS – Multiprotocol Label Switching

    Refers to a protocol-agnostic routing technique designed to speed up and control the traffic flow across wide area networks (WANs). Various labels are assigned to IP data packages that enable routers to forward packages through the network very quickly using the best possible route.

  • MVNO – Mobile Virtual Network Operator

    Company that offers mobile minutes at relatively low prices without subsidized handsets. A mobile virtual network operator does not have its own wireless network, but uses the infrastructure of another mobile operator to provide its services.

  • Mobile Termination Rate

    Termination refers to the transportation of a call, for example, from the competitor’s network to the Deutsche Telekom network. When a call is transported to the mobile communications network, this is referred to as mobile termination. If the call is transported to the fixed network, this is called fixed-network termination, or simply interconnection (IC). Termination rates are the fee a telephone company must pay for network interconnection when a call is terminated in a third-party network.

  • Mobile customers

    In the combined management report, one mobile communications card corresponds to one customer. The totals were calculated on the basis of precise figures and rounded to millions or thousands. Percentages were calculated on the basis of the figures shown (see also SIM card).


  • OTT player – Over-The-Top

    IP-based, platform-independent services, e.g., messaging or streaming.

  • Offshore

    Offshoring describes collaboration with partners in other countries. With offshoring, a company outsources activities to other countries. The term nearshore (or nearshoring) refers to a special kind of offshoring. From a European perspective, it generally means outsourcing to countries further to the east.

  • Optical fiber

    Channel for optical data transmission.


  • PUE – Power Usage Effectiveness

    PUE is the ratio of the entire electrical energy consumed in a data center or network node to the energy delivered to the computing equipment.

  • Postpaid

    Customers who pay for communication services after receiving them (usually on a monthly basis).

  • Prepaid

    In contrast to postpaid contracts, prepaid communication services are services for which credit has been purchased in advance with no fixed-term contractual obligations.


  • Retail

    The sale of goods and services to end users. By contrast, the business with wholesale services for other telecommunications companies is referred to as wholesale business.

  • Roaming

    Refers to the use of a communication device or just a subscriber identity in a visited network rather than one’s home network. This requires the operators of both networks to have reached a roaming agreement and switched the necessary signaling and data connections between their networks. Roaming comes into play, for example, when cell phones and smartphones are used across national boundaries.

  • Router

    A coupling element that connects two or more sub-networks. Routers can also extend the boundaries of a network, monitor data traffic, and block any faulty data packets.


  • SBTi – Science Based Targets initiative

    Initiative that helps companies to set climate goals that comply with emissions budgets determined based on scientific data. Companies can forward their goals to the initiative for review. The initiative was set up jointly by several organizations: CDP, United Nations Global Compact (UNGC), World Resources Institute (WRI), and the World Wide Fund for Nature (WWF).

  • SD-WAN – Software-Defined Wide Area Network

    SD-WAN simplifies the management and operation of a WAN by decoupling the network hardware from its control mechanism. This concept is similar to the way in which software-defined networking implements virtualization technology in order to improve the management and operation of data centers. A key application of SD-WAN is to allow companies to build higher-performance WANs using lower-cost and commercially available internet access. This would enable companies to partially or wholly replace private WAN connection technologies.

  • SIM card – Subscriber Identification Module card

    Chip card that is inserted into a cell phone to identify it in the mobile network. Deutsche Telekom counts its customers by the number of SIM cards activated and not churned. Customer totals also include the SIM cards with which machines can communicate automatically with one another (M2M cards). The churn rate is determined and reported based on the local markets of the respective countries.

  • Sovereign Cloud

    Data sovereignty is the central goal of the European initiative GAIA-X. With a European concept, companies of all sizes should be able to take advantage of the flexibility and innovative power of the complete cloud stack, while at the same time having the security of always remaining the master of their data. The Sovereign Cloud from GAIA-X relies on an open software ecosystem for its technical implementation, which on the one hand enables digital solutions and on the other hand can be operated on a wide range of infrastructures.

  • Sustainable Development Goals (SDGs)

    Goals that form the core of the 2030 Agenda, which the member states of the United Nations adopted in 2015 to ensure sustainable global development. The aim is to enable economic development and prosperity – in line with social justice and taking account of the ecological limits of global growth. The Agenda applies equally to all nations of the world. The 17 SDGs define goals to reduce poverty and hunger, promote healthcare and education, enable equality, protect the environment and climate, and make consumption sustainable.


  • TISAX® – Trusted Information Security Assessment Exchange

    TISAX® is a cross-company assessment and exchange process for information security in the automotive industry. It enables shared recognition of assessment results between participants registered for the TISAX® process, generally automotive manufacturers and their suppliers.


  • ULL – Unbundled Local Loop

    Competitors whose own networks do not reach into customers’ premises can rent unbundled local loop lines from Deutsche Telekom. Their networks end at the local exchanges. The ULL bridges the distance between the local exchange and the termination point on the customer’s premises or in their home, so it is also known as the “last mile.”


  • VR – Virtual Reality

    A simulated experience of the real world and its physical characteristics in real time in a computer-generated, interactive virtual environment. Unlike AR, which focuses on enhancing the real world with visual representations of additional data, VR fully immerses the user in a virtual world.

  • Vectoring

    Vectoring is a noise-canceling technology that removes the electro-magnetic interference between lines, enabling higher bit rates. However, in order to cancel noise, the operator must have control over all lines. This means that other operators cannot install their own technology in the street cabinets.


  • Wholesale

    Refers to the business of selling services to telecommunications companies which sell them to their own retail customers either directly or after further processing.


  • XR – extended reality

    Covers the entire virtuality spectrum: augmented reality, virtual reality, mixed reality, and simulated reality, as well as potential future developments.

    • AR – Augmented Reality. The computer-generated enhancement of the real world with perceptual information. The information can address all the human senses. However, augmented reality often only encompasses the visual representation of information, i.e., the augmenting of images or videos with additional computer-generated information or virtual objects using overlaying/superimposition.
    • VR – Virtual Reality. A simulated experience of the real world and its physical characteristics in real time in a computer-generated, interactive virtual environment. Unlike AR, which focuses on enhancing the real world with visual representations of additional data, VR fully immerses the user in a virtual world.