ekom. (Also written DBP- Carriage Return. (Code used on a teleprinter to start T. German PTT.) a new line.) Data Communication Channel. Call Routing Apparatus. Digitally Coded Delta Modulation. (Delta modula- Cyclic Redundancy Check. (Bit oriented protocol tion technique in which the step size is controlled by used for checking for errors in transmitted data.) the bit sequence produced by the sampling and quan- Cathode Ray Tube. tisation.) Central Station. Data Circuit termination Equipment. (Exchange end Circuit Switched Data Network. of a network, connecting to a DTE. Usually used in Carrier Sense Multiple Access. (LAN Multiple ac- packet switched networks.) cess technique.) Data Communications Function. CSMA/CD Carrier Sense Multiple Access with Collision Detec- Data Communications Network. tion. (LAN access technique, with improved Dynamically Controlled Routing. (Traffic routing throughput, under heavy load conditions, compared method proposed by Bell Northern Research, Ca- to pure CSMA.) nada.) Computer Supported Telephony Applications. (Or Digital Cellular System. (For example DCS 1800 Computer Supported Telecommunication Applica- operating at 1800MHz.) tions. For example, telemarketing applications.) Digital Crossconnect System. (See also DCX and Channel Service Unit. (Subscriber line terminating DXC.) unit in North America.) Dynamic Channel Selection. (For example as used Cordless Telephony. (CT1 is first generation; CT2 is on call set-up in the CEPT 900MHz analogue cord- second generation, and CT3 is third generation.) less telephony standard.) Cable Television Association. (UK trade association Discrete Cosine Transform. (Technique used in of cable television suppliers.) transform picture coding.) CTCSS Continuous Tone Controlled Squelch System. Digital Crossconnect. (See also DXC and DSC.) (Method for calling in paging systems.) Data Country Code. (Part of an international tele- Centre for Telecommunications Development. (Part phone number.) of ITU.) Direct Distance Dialling. (Generally refers to con-