 radio loop pro- system.) vided by carriers in the US.) Distinguishing Name. Digital Crossconnect. (See also DCX and DCS.) Dynamic Non-Hierarchical Routing. (Traffic rout- ing method implemented by AT&T.) Data Network Identification Code. (Part of an inter- European Unit of Account. (Earlier monitory unit of national telephone number.) the EEC which was created in 1974 and replaced by Department Of Defence. (US agency.) the ECU in 1981.) Disk Operating System. (Popular operating system EBCDIC Extended Binary Coded Decimal Interchange Code. for personal computers.) (Eight bit character code set.) DOTAC Department of Transport And Communications. European Broadband Interconnect Trial. (Collabor- (Australian.) ative effort between PTOs to support RACE appli- Data Over Voice. (Technique for simultaneous trans- cation pilots into switched broadband. Initial trial mission of voice and data over telephone lines. This was planned at 2Mbit/s switched, progressing to is a less sophisticated technique than ISDN.) 140Mbit/s.) Differential Pulse Code Modulation. European Broadcasting Union. DPNSS Digital Private Network Signalling System. (Inter- European Commission. PABX signalling system used in the UK.) Embedded Communication Channel. (Channel used Distributed Queue Double Bus. (IEEE standard within SDH to carry communication information 802.6 for Metropolitan Area Networks.) rather than data.) DQPSK Differential Quaternary Phase Shift Keying. Error Control Coding. (Coding used to reduce errors Direction a la Reglementation Generale. (Director- in transmission.) ate for General Regulation, in France.) ECITC European Committee for IT Certification. DRIVE Dedicated Road Infrastructure for Vehicle safety in European Court of Justice. Europe. (European Community programme in the Emitter Coupled Logic. (Integrated circuit technol- area of information technology and telecommunica- logy.) tions, associated with road transport.) European Computer Manufacturers Association. 62/8 Glossary ECREEA European Conference of Radio and Elec