A.3 Abbreviations

• AIE Air Interface Encryption
• ASCI Advanced Speech Call Items
• BAKOM Bundesamt für Kommunikation
• BMI Bundesministerium des Inneren
• BOS Behörden und Organisationen mit Sicherheitsaufgaben
• BSI Bundesministerium für Sicherheit in der Informationstechnik
• CDMA Code Division Multiplex Access
• DIN Deutsche Industrie Norm
• DM Deutsche Mark
• DMO Direct Mode: allows terminals to connect without a base station
• EMLPP Enhanced Multi-Level Precedence and Preemption
• ETSI European Telecommunications Standardization Institutes
• FDMA Frequency Division Multiplex Access
• GAN Gruppe Anforderungen an das Netz
• GPRS General Packet Radio Service: offers packet switched data services, which are well suited for irregular traffic patterns such as Internet and intranet access
• GSM-R GSM for Railway: extension to GSM especially for railway purposes
• GSM Global Systems for Mobile Communications
• HSCSD High-Speed Circuit Switched Data: increases data communication speeds using multiple time slots for a single user
• IP Internet Protocol
• ISI Inter-System Interface: open interface standard used to connect two TETRA networks together
• MHz Mega Hertz (cycles per second)
• MSC Mobile Services Switching Center
• MTP-1327 Ministry of Post and Telecommunications standard 1327
• NATO North Atlantic Treaty Organization
• PAMR Public Access Mobile Radio: the network are owned and operated for commercial purposes by offering the network services to users
• PKI Public Key Infrastructure
• PMR Private Mobile Radio/Professional Mobile Radio: the network is owned and operated by a single user organization with only local coverage
• PSS Public Safety and Security
• PTT Push to Talk
• SIM Subscriber Identity Module
• SMS Short Message Service
• TDMA Time Division Multiplex Access
• TETRA Trans-European Trunked Radio System, later renamed to Terrestrial Trunked Radio
• THW Technisches Hilfswerk
• UMTS Universal Mobile Telecommunications System
• VBS Voice Broadcast Service
• VGCS Voice Group Call Service
• WAP Wireless Application Protocol
• WML Wireless Markup Language: is direved from HTML and allows to create simple pages for mobile purposes
• ZED Zentralstelle zur Vorbereitung der Einführung eines bundeseinheitlichen digitalen Sprech- und Datenfunksystems
• kHz kilo Hertz (cycles per second)