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Telecommunications Abbreviations Dictionary: A-D  E-K  L-Z


  • 2BASE-TL - IEEE EFM Standard
  • 3G - the third generation of mobile phone standards and technology; it supercedes 2G.
  • 4G - the fourth generation of mobile phone standards and technology; it supercedes 3G.
  • 8xx - 800, 866, 877 or 888 - prefix for toll free numbers in the USA and Canada.
  • ADSL - Asymmetric Digital Subscriber Line - as opposed to SDSL, the download speed to the customer premises is greater than the upload speed into the Internet, for example, the following are some typical speed options: 1.5 Mb x 128 Kbps, 1.5 Mb x 256 Kbps, 3 Mbps x 384 Kbps, 3 Mbps x 512 Kbps
  • AJAX - Asynchronous JavaScript and XML
  • AMI - Alternate Mark Inversion - a type of line coding that has been used for T1 and E1 services. It has been replaced in more recent networks by B8ZS, HDB3, and other codes.
  • ASN - Autonomous System Number - Used for routing on Internet
  • BCDR - Business Continuity and Disaster Recovery
  • BGP - Border Gateway Protocol - BGP is used to accomplish load balancing when you have more than one dedicated circuit from more than one ISP
  • BI - Business Intelligence
  • BPL - Broadband over Power Lines
  • BTN - Billing Telephone Number
  • BW - bandwidth
  • CallerID - A service which transmits the caller's phone number to the called party along with the ringing signal. See CNAM.
  • CAS - Channel Associated Signaling - a form of digital communications signaling in which the routing information directing the payload to its destination is in band; i.e., within the same channels as voice and/or data transmission, as opposed to out-of-band; i.e., on a separate control channel. See CCS.
  • CBR - Committed Bit Rate
  • CCIS - Common Channel Interoffice Signaling - a form of out-of-band-signaling. See CCS.
  • CCS - Common Channel Signaling aka as CCIS - a form of digital communications signaling in which the routing information directing the payload to its destination is out-of-band; i.e., on a separate control channel than voice and/or data transmission, as opposed to in band; i.e., within the same channels. See CAS.
  • CDMA - Code Division Multiple Access - a wireless technology using TIA/EIA IS-95 protocol that allows multiple cell phones to share bandwidth used by carriers such as Sprint and Verizon Wireless.
  • CDR - Call Detail Record
  • CDR - Committed Data Rate - bandwidth equivalent of the port at each customer location.
  • CE - Customer Edge of network - Customer equipment connected to a Ethernet service
  • CEF - CISCO Express Forwarding - an industry standard for binding data Ts together without voice or video service.
  • CET - Carrier Ethernet Transport - an architectural approach to building scalable transport infrastructure for supporting the evolution to NGNs that integrates Ethernet tunnel switching and intelligent WDM (WDM giving the ability to do multi-degree switching at wavelength and sub wavelength levels).
  • CIR - Committed Information Rate
  • CLEC - Competitive Local Exchange Carrier - a phone company that competes with an ILEC.
  • CNAM - Calling Name Delivery - a service which transmits the caller's name in addition to the caller's phone number to the called party along with the ringing signal. See CallerID.
  • CO - Central Office - This is the building near your location that your phone and internet lines run to.
  • COS - Class of Service - IP traffic prioritization
  • CPNI - Customer Proprietary Network Information - individually identifiable information that is created by a customerís relationship with a communications provider, for example, data about the duration, frequency and timing of calls, information on a customerís bill and call detail information.
  • CRDD - Customer Requested Due Date - Date by which customer would like to have service turned on.
  • CSU - Channel Service Unit - For digital lines, provides termination for the digital signal and ensures connection integrity through error correction and line monitoring.
  • CSU/DSU - Channel Service Unit/Data Service Unit - Connects a digital line (e.g., T1 or DS3) to a LAN; typically routers have CSU/DSUs built in.
  • CWDM - Coarse Wavelength Division Multiplexing - This technology greatly increases the carrying capacity of fiber optic cables. It uses up to 8 different wavelengths for different channels. See DWDM.
  • DC - Data Center
  • DDR - double-data rate - normally applied to DRAM
  • DECT - Digital Enhanced Cordless Telecommunications - a digital wireless telephone 3G technology using TDMA over radio frequencies (1880-1900 MHz in Europe and many other areas; 1920-1930 MHz, or 1.9 GHz in the USA) to cordless phones.
  • DeMarc - Demarcation Point - point where telecommunications facilities owned by one organization interface with those of another organization - typically the point at an organization's floor telephone closet were organization circuit(s) interfaces with the telephone service provider's circuit(s).
  • DHCP - Dynamic Host Configuration Protocol - Protocol by which IP addresses and other parameters are assigned to clients for a certain time period (Lease).
  • DIA - Dedicated Internet Access - This includes fractional T1, T1, bonded T1, fractional T3, DS3, and OC3 service.
  • DID - Direct Inward Dialing - A feature that allows there to be more direct dial phone numbers than there are lines into a location. When a call comes through, the number that was dialed is passed with the call so that a PBX can handle the call in a prescribed manner. For example, there may be 100 offices within a building with only 20 phone lines coming in from the phone company. With 100 DIDs, the PBX can send an incoming call to whichever of the 100 offices is assigned the DID that was dialed.
  • DLCI - Data Link Connection Identifier
  • DMH - Dual Mobile Handset - a handset that has Wi-Fi and traditional cellular offerings in one device.
  • DOCSIS- Data Over Cable Service Interface Specification - DOCSIS is an international telecommunications standard that permits the addition of high-speed data transfer to an existing Cable TV (CATV) system. Cable providers use DOCSIS to provide Internet access over their HFC infrastructure.
  • DoS - Denial of Service
  • DRAM - dynamic random access memory
  • DSL - Digital Subscriber Line - a family of technologies that offers digital data transmission between the local phone company Central Office and the customer. Typically, DSL speeds range between 128 Kbps and 3 Mbps. See ADSL, IDSL and SDSL for some of the different options. Cost and reliability of DSL service is less than that of T1 service.
  • DSLAM- DSL access multiplexor
  • DSM - Dynamic Spectrum Management.
  • DSU - Data Service Unit - For digital lines, converts T1 or T3 line frames into frames the LAN can interpret and vice versa; it manages timing errors and signal regeneration.
  • DTO - direct termination overflow - a feature whereby a call being terminated on a phone trunk can be forwarded to a 10-digit phone number if the trunks are full.
  • DVI - Digital Visual Interface
  • DWDM - Dense Wavelength Division Multiplexing - This technology exponentially increases the carrying capacity of fiber optic cables. It uses up to 40 different wavelengths for different channels. Only a handful of the largest telecommunications providers operate commercial DWDM networks. Few organizations are large enough to need such capacity.

Telecommunications Abbreviations Dictionary: A-D  E-K  L-Z

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