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The term e-learning refers to all forms of learning that are supported by electronic media such as the Internet.

E-TASC (Electronics-Tool for Accountable Supply Chain)

The electronics industry's information tool – E-TASC – is an innovative instrument that helps us to establish transparency with regard to the social and ecological aspects of our supply chains.

ECO Mode

ECO Mode  designates a function in wireless data transmission between the base station and the phone handset or computer. It enables a significant reduction in the transmission power of the devices, along with the associated electromagnetic radiation, without any sacrifice in performance.

EDGE (Enhanced Data Rates for GSM Evolution)

Modulation on the air interface to enhance data rates in GSM (Global System for Mobile Communications) and TDMA (Time Division Multiple Access) networks.


EMF (electromagnetic fields) are a combination of electric and magnetic fields. They are produced when electric current and charges change. This forms an electromagnetic wave, which propagates in space or through matter. This wave transports energy and is used in mobile communications to transmit data.

EMF (electromagnetic fields)

Electromagnetic fields (EMF) are produced when electric currents and charges change and form an electromagnetic wave which propagates in space or through matter. The wave transfers energy. Some EMFs occur in nature – daylight, for example – while others are generated by technical devices.

End-of-life management

The goal of end-of-life management is to recycle materials and resources at the end of a product's life. Its central tasks include not only material and energy recycling but also responsible disposal of residual materials. End-of-life management  is a key element in a completely sustainable product lifecycle, and plays a crucial role for ICT products.

Energy performance certificate

The energy performance certificate is used to assess the energy performance of buildings according to the Energy Saving Ordinance (Energieeinsparverordnung—EnEV). The EnEV translates the EC Directive on Energy Efficiency into national law.

Escalation process

Deutsche Telekom has defined a progressive escalation process to handle cases in which a supplier refuses to undergo audits or provide self-assessments or violates Deutsche Telekom standards. The company classifies the risks associated with the supplier's behavior and develops escalating measures based on the risk category. Measures range from targeted development programs for suppliers, sanctions or even termination of the contractual relationship.


ESG  describes a company's conduct from an environmental, social and governance perspective.

EU Corporate Leaders Group on Climate Change

The EU Corporate Leaders Group on Climate Change  (EU CLG) initiative, which was founded by the Prince of Wales, is an association of 18 leading European companies from different industries. As a founding member of the EU CLG, Telekom is dedicated to an ambitious, fair agreement on the global reduction of CO2 emissions.

eBest ordering system

eBest is Telekom's electronic ordering system. It is available to all employees in Germany and offers more than 900 environmentally friendly office items in addition to conventional office supplies.