Electronics Technical Information Abbreviations & Acronyms

A-D: Analog to digital conversion CEN: European Committee for Standardization E: Symbol for voltage. Usually used to represent ac: Alternating current CENELEC: European Committee for direct voltage or the effective (root-mean-square) AC: Armored Cable, NEC Article 333 Cable Electrotechnical Standardization value of an alternating voltage Designation CFC: Communications Flat Cable EFTS: Electronic funds transfer system AC0: Analog Central Office ckt: Circuit EIA: Electronic Industries Association ACR: Attenuation to Crosstalk Ratio CLT or CLOS: Closet EMF: Electromotive Force ADO: Auxiliary Disconnect Outlet CL2: Class 2 Circuit Cable, NEC Article 725 Cable EMI: Electromagnetic Interference AER: Aerial Designation EMT: Electric Metallic Tubing AF: Audio frequency CL2P: Class 2 Circuit Plenum Cable, NEC Article EP: Entrance point AIA: American Institute of Architects 725 Cable Designation EPDM: Ethylene-propylene-diene monomer rubber ALPETH: An aerial telephone cable having an alu- CL2R: Class 2 Circuit Riser Cable, NEC Article 725 EPOS: Electronic Point-Of-Sale minum shield and polyethylene jacket Cable Designation EPR: Ethylene-propylene rubber ALS: A type of cable consisting of insulated con- CL2X: Class 2 Circuit Limited Use Cable, NEC ER: Equipment room ductors enclosed in a continuous, closely fitting Article 725 Cable Designation ESS: Electronic Switching System aluminum tube CL3: Class 3 Circuit Cable, NEC Article 725 Cable ESTA: Australian approval agency; Electricity Trust ALVYN: An indoor, riser rated telephone cable hav- Designation of South Australia ing an aluminum shield and vinyl jacket (PVC) CL3P: Class 3 Circuit Plenum Cable, NEC Article ETPC: Electrolytic Tough Pitch Copper 725 Cable Designation AM: Amplitude Modulation ETV: Educational Television CL3R: Class 3 Circuit Riser Cable, NEC Article 725 ANSI: American National Standards Institute E/W: Equipped With Cable Designation ARPANET: Advanced Research Projects Agency EX or EXT: Extension Network CL3X: Class 3 Circuit Limited Use Cable, NEC Article 725 Cable Designation EXCH: Exchange ASCII: American Standard Code for Information f: Frequency Interchange CM: Communications Cable, NEC Article 800 Cable FAA: Federal Aeronautics Administration ASME: American Society of Mechanical Engineers Designation FCC: (1) Federal Communications Commission (2) ASP: A filled, direct burial telephone cable used in CMA: Circular Mil Area CMP: Communication Cable Plenum, NEC Article Flat Conductor Cable, NEC Article 328 Cable areas subject to rodent attack. It consists of a Designation filled cable core, corrugated aluminum shield, 800 Cable Designation FDDI: Fiber Distributed Data Interface corrugated steel tape, flooding compound and CMR: Communications Cable Riser, NEC Article polyethylene jacket. 800 Cable Designation FDM: Frequency-Division ASTA: United Kingdom approval agency CMX: Communications Limited Use Cable, NEC FDR: Feeder ASTM: American Society for Testing and Materials Article 800 Cable Designation FEP: Fluorinated ethylene propylene AWG: American Wire Gauge CO: Central Office FEXT: Far End Crosstalk AWM: Appliance wiring material codec: Coder decoder FI: Approval agency of Finland; Electrical Inspectorate B & S Gauge: See American Wire Gauge (AWG) COE: Central Office Equipment FIPS Pub: Federal Information Processing B or BUR: Buried COS: Cooperation for Open Systems Standard Publication AWM: Appliance wiring material COSINE: Cooperation for Open Systems FM: Frequency modulation BCF: Billion Conductor Feet Interconnection Network in Europe FOCIS: Fiber Optic Connector Intermateability BEF: Building Entrance Facility COT: Central Office Terminal CPC: Customer Premises Communication Standard BER: Bit Error Rate FOTP: Fiber Optic Test Procedure BIC: Building Industry Consultant CPE: (1) Chlorinated Polyethylene (2) Customer Premises Equipment or Customer Provided FOTS: Fiber Optics Transmission System BICSI: Building Industry Consulting Service Equipment FPL: Power Limited Fire Protective Signaling Circuit International CPU: Central Processing Unit Cable, NEC Article 760 Cable Designation BISDN: Broadband Integrated Services Digital CRT: Cathode Ray Tube FPLP: Power Limited Fire Protective Signaling Network Circuit Plenum Cable, NEC Article 760 Cable BTU: British Thermal Unit CSMA/CD: Carrier Sense Multiple Access/ Collision Detection Designation CA: Cable CSPE: Chlorosulfonated Polyethylene FPLR: Power Limited Fire Protective Signaling CATV: (1) Community Antenna Television; Cable Circuit Riser Cable, NEC Article 760 Cable CTR: Certified Test Report Access Television (2) CATV Cable, NEC Article Designation CV: Continuous vulcanization 820 Cable Designation FR-1: A flammability rating established by CATVP: CATV Plenum Cable, NEC Article 820 Cable D-A: Digital to analog conversion Underwriter's Laboratories for wires and cables Designation DAF: Dedicated Access Facility that pass a specially designed vertical flame test CATVR: CATV Riser Cable, NEC Article 820 Cable dB: Decibel freq: Frequency Designation DBS: Direct Broadcast Satellite FRICC: Federal Research Coordinating CATVX: CATV Limited Use Cable, NEC Article 820 dc: Direct current Committee (now FNC) Cable Designation DCE: Data Circuit-Terminating Equipment FRPE: Flame Retardant Polyethylene CB: Citizens band DCO: Digital Central Office ft: Foot C-C: Conductor to conductor capacitance DCR: Direct Current Resistance FTP: Fire Transfer Protocol CCITT: The International Telegraph and Telephone DD: Distribution Designer or Distribution Device ga: Gauge Consultative Committee DEMARC: Demarcation point gHZ: Gigahertz CCTV: Closed-circuit television DEMKO: Approval agency of Denmark grd: Ground CDDI: Copper Distributed Data Interface DGM: Data Grade Medium GTO: Gas tube sign and oil-burner ignition cable. CDF: Central Distribution Frame DISA: Defense Information Systems Agency 5,000V-15,000V. CDO: Community Dial Office (formerly DCA) H: Designation for intensity of magnetic energy CEBEC: Belgium approval agency; Commite DISI: Directory Information Services Infrastructure hc: Handset combination (single-line telephone) Electrotechnique Belge Service de la Marque DIST: District HC: Horizontal cross-connect CEE: European standards agency; International DRT: Plastic range and dryer cord (CSA) hck: Handset combination; key (six-button Commission on Rules for the Approval of DTE: Data Terminal Equipment telephone) Electrical Equipment DVD: Digital Versatile Disc HDPE: High Density Polyethylene DW: Distribution Wire HF: High Frequency

216 Technical Information Electronics Abbreviations & Acronyms

hh: Handhole MDPE: Medium Density Polyethylene PABX: Private Automatic Branch Exchange Hi-Pot: A test designed to determine the highest Meg or Mega: A numerical prefix denoting PAM: Pulse Amplitude Modulation voltage that can be applied to a conductor 1,000,000 (106) PAP: A commonly used term for air core (unfilled) without breaking through the insulation. M/G: Motor/Generator Set direct burial telephone cable with a corrugated HPD: Rubber- and asbestos-insulated heater cord. MH: Manhole aluminum shield No braid on individual conductors but with braid Mho: The unit of conductivity. The reciprocal of an PBX: Private Branch Exchange overall. Also made with neoprene insulation and ohm. PC: Personal Computer no asbestos or PVC/NBC. MHz: Megahertz PCB: Printed Circuit Board HPN: Two-conductor, neoprene-insulated heater MI: Mineral Insulated Cable, NEC Article 330 P-FEP: General Cable proprietary dielectric cord. Parallel construction. For use in damp Cable Designation material used injunction with FEP. locations. Micro: A numerical prefix denoting one-millionth PCM: Pulse Code Modulation HSJ: Same as type HS but with #18, #16 and #14 6 (10 ) PCP: A commonly used term for air core (unfilled) conductors and differing thickness of jacket. MIL STD: Military Standard direct burial cable with a corrugated copper HVAC: Heating, ventilation and air conditioning MILNET: Military Network shield Hz: Hertz MLT: Multi-Level Threshold PE: Polyethylene i: Symbol used to designate current mm: Millimeter pf: Picofarad IC: Intermediate cross-connect Modem: Modulator demodulator PFA: Polyfluoroalkoxy ICEA: Insulated Cable Engineers Association MTT: Main Telephone Terminal PIC: A general term for any type of plastic IDC: Insulation Displacement Connector MTW: Machine Tool Wire insulated telephone cable IEC: Internation Electrotechnical Commission MV: Medium Voltage Cable, NEC Article 326 Pico: A numerical prefix denoting one-millionth of -12 IEEE: Institute of Electrical and Electronics Cable Designation one-millionth (10 ) Engineers MW: Radio hookup wire with polyvinyl insulation PL: Private Lines IGS: Integrated Gas Spacer Cable, NEC Article and plain or nylon jacket or braid, or shield, PLSJ: All-rubber, parallel-jacketed, two- 325 Cable Designation 1000V conductor, light-duty cord for pendant or IMSA: International Municipal Signal Association N: Newton portable use in damp locations. 300V. in: Inch NAIC: Network Applications and Information PLT: (1) Plant (2) Same as PLSJ except thermo- IRSG: Internet Research Steering Group Center plastic insulation IRTF: Internet Research Task Force NASA: National Aeronautics and Space PLTC: Power Limited Tray Cable, NEC Article 725 IS: International Standard Administration Cable Designation ISA: Instrument Society of America NBR: Natural butadiene-acrylonitrile copolymer PM: Phase Modulation ISDN: Integrated Services Digital Network rubber POI: Point Of Interface ISO: International Organization for Standardization NBS: National Bureau of Standards (now NIST) POSJ: All-rubber, parallel, light duty rip-cord for ISOC: Internet Society NEC: National Electrical Code use on lamps and small appliances, 300V, 60°C ITCO: Independent Telephone Company NEMA: National Electrical Manufacturers POT: Thermoplastic, parallel, light duty rip-cord. ITU-T: International Union - Association 300V, 60°C to 105°C. Telecommunications Standardization Section NEMKO: Approval agency of Norway POTS: Plain Old Telephone Service (colloquial) IW (C): Inside Wiring (cable) NESC: National Electrical Safety Code PP: Polypropylene J: Joule NEXT: Near End Crosstalk PR: Pair kcmil: One thousand circular mils nf: Nanofarad PTFE: Polytetrafluoroethylene KEMA KEUR: Approval agency of the Netherlands NFPA: National Fire Protection Association PTSS: Passive Transmission Sub-System kft: An abbreviation for 1000 ft. NI: Network Interface PVC: Polyvinyl Chloride kHz: Kilohertz NID: Network Interface Device PVDF: Polyvinylidene Fluoride Kilo: A numerical prefix denoting 1000 (103) NIST: National Institute of Standards and R: Symbol for resistance km: Kilometer Technology (formerly NBS) R-F: Radio-frequency KTS: Key Telephone Service NIU: Network Interface Unit RCDD: Registered Communication Distribution kV: Kilovolt nm: Nanometer Designer kVA: Kilovolt Ampere NM & NMC: Non Metallic Sheathed Cable, NEC REA: Rural Electrification Administration kW: Kilowatt Article 336 Cable Designation REP: Repair LAN: NPLF: Non Power-Limited Fire Protective RFQ: Request for Quote LASER: Light Amplification by Stimulated Signaling Circuit Cable, NEC Article 760 Cable RG/U: General utility grade military Emission of Radiation Designation RH: Relative humidity LATA: Local Access Transport Area NPLFP: Non Power-Limited Fire Protective RJ-45: A specific pin-point assignment for an eight Signaling Circuit Plenum Cable, NEC Article 760 lbf: Pound force position modular telecommunications Cable Designation connector. LBO: Line Buildout NPLFR: Non Power-Limited Fire Protective RMS: (1) rack mount space (2) Root Mean LDPE: Low Density Polyethylene Signaling Circuit Plenum Cable, NEC Article 760 Squares LEC: Local Exchange Carrier Cable Designation RoHS: Restriction on Hazardous Substances LED: Light-Emitting Diode NRZ: Non Return to Zero S: Heavy-duty, rubber-insulated portable cord. LLDPE: Linear Low Density Polyethylene NRZI: Non Return to Zero Inverted Stranded copper conductors with separator and LOCA: Loss of Coolant Accident OC: Optical Carrier individual rubber insulation. Two or more color- locap: Low-capacitance, low-loss paired cable ODC: Ozone Depleting Chemical coded conductors cabled with filler, wrapped with MAC: Moves, Adds and Changes OP: Outside Plant separator and rubber jacketed overall, 600 Volts. MAP: Manufacturing Automation Protocol OPE: Outside Plant Engineer SAE: Society of Automotive Engineers MATV: Master Antenna Television OSHA: Occupational Safety and Health SANZ: Standards Association of New Zealand Mbps: Megabits per second Administration SBR: Styrene Butadiene Rubber MC: (1) main cross-connect (2) Metal Clad Cable, OSI: Open Systems Interconnection ScTP: Screened Twisted Pair NEC Article 334 Cable Designation OVE: Approval agency of West Germany; SDN: Switched Digital Network MCM: One thousand circular mils Oesterreichischer Verband fur Elektrotechnik MDF: Main Distribution Frame

217 Electronics Technical Information Abbreviations & Acronyms

SE: Service Entrance Cable, NEC Article 338 SWR: Standing Wave Ratio Cable Designation SYS: System SEMKO: Approval agency for Sweden TC: (1) Power and Control Tray Cable, NEC Article SFTP: Simple File Transfer Protocol 340 Cable Designation (2) Telecommunications SI: System Internationale Closet SJ: Junior hard-service, rubber-insulated pendant or TCP: Transmission Control Protocol portable cord. Same construction as type S, TDM: Time-Division Multiplexing but 300V. Jacket thickness different. TEL: Telephone SJO: Same as SJ, but carolprene, oil-resistant com- TELCO: Telephone Company pound outer jacket. Can also be made "water- TERM: Terminal or termination resistant." 300V, 60°C. TEW: Canadian Standard Association type SJT: Junior hard service thermoplastic or rubber- appliance wires. Solid or stranded single insulated conductors with overall thermoplastic conductor, plastic-insulated, 600V, 105°C. jacket, 300V, 60°C to 105°C. TF: Fixture wire, thermoplastic-covered solid or SJTO: Same as SJT but oil-resistant thermo- seven strands. 60°C. plastic outer jacket. 60°C. TFE: Tetrafluoroethylene SMTP: Simple Mail Transfer Protocol TFF: Same as TF but flexible stranding. 60°C. SNA: Systems Network Architecture THHN: 90°C, 600V nylon jacketed building wire SNM: Shielded Non Metallic Sheathed Cable, NEC THW: Thermoplastic vinyl-insulated building wire. Article 337 Cable Designation Flame-retardant, moisture- and heat-resistant. SNMP: Simple Network Management Protocol 75°C. Dry and wet locations. SNR: Signal to Noise Ratio THWN: Same as THW but with nylon jacket SO: Hard-service cord, same construction as type overall. 75°C. S except oil-resistant carolprene jacket, 600V, TIA: Telecommunications Industry Association 60° to 90°C. TOC: Tin Overcoat SONET: Synchronous Optical Network TP: Transport Protocol SP-1: All rubber, parallel-jacketed, two-conductor TP-PMD: Twisted Pair-Physical Medium Dependent light-duty cord for pendant or portable use in TPDDI: Twisted Pair Distributed Data Interface damp locations. 300V. TSB: Telecommunications System Bulletin SP-2: Same as SP-1, but heavier construction, with or without third conductor for grounding TT: Telephone Terminal purposes. 300V. TTB: Telephone Terminal Board SP-3: Same as SP-23, but heavier construction for TTY: Text Telephones refrigerators or room air conditioners. 300V. TW: Thermoplastic vinyl-jacketed building wire, SPC: Stored Program Control moisture-resistant. 60°C. SPG: Single Point Ground UCC: Uniform Code Council SPT-1: Same as SP-1, except all-thermoplastic. UF: Thermoplastic underground feeder and 300V. With or without third conductor for branch circuit cable grounding. UF: Underground Feeder and Branch Circuit SPT-2: Same as SP-2, except all-thermoplastic. Cable, NEC Article 339 Cable Designation 300V. With or without third conductor for UG: Underground grounding. UHF: Ultra High Frequency, 300 to 3,000 MHz SPT-3: Same as SP-3, except all-thermoplastic. UL: Underwriter's Laboratories, Inc. 300V. With or without third conductor for µm: Micron or micrometer grounding. UPC: Universal Packaging Code SRD: Portable range or dryer cable. Three or four UPS: Uninterruptible Power Supply rubber-insulated conductors with rubber or USE: Underground Service Entrance Cable, NEC neoprene jacket, flat or round construction. Article 338 Cable Designation 300V, 60°C. UTE: Approval agency for France; Union SRDT: Same as SRD, except all-thermoplastic Technique de l'Electricite with a maximum temperature of 90°C. UTP: Unshielded twisted-pair SRL: Structural return loss V: Volt ST: Hard-service cord, jacketed, same as type S VDE: West Germany approval agency except all-plastic construction, 600V, 60°C to 105°C. VHF: Very High Frequency, 30 to 300 MHz STA: Station VP: Velocity of Propagation STO: Same as ST but with oil-resistant thermo- VSWR: Volume Standing Wave Radio plastic outer jacket. 600V, 60°C. VW-1: A flammability rating established by STP: Shielded twisted pair Underwriters Laboratories for wires and cables that pass a specially designed vertical flame SV: Vacuum cleaner cord, two or three-conductor, test, (formerly designated FR-1) rubber-insulated. Overall rubber jacket. For light- duty in damp locations. 300V, 60°C. W: Symbol for watt or wattage SVO: Same as SV except carolprene jacket, 300V, WA: Work area 60°C. WP: Waterproof Outlet SVT: Same as SV except all-plastic construction. X: Cross-connect With or without third conductor for grounding XLPE: Crosslinked polyethylene purposes only. 300V, 60°C to 90°C. Z: Symbol for impedance SW: Station Wire SWB: Switchboard

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