Electronics Abbreviations & Acronyms hh: Handhole Hi-Pot: A test designed to determine the highest voltage that can be applied to a conductor without breaking through the insulation. HPD: Rubber- and asbestos-insulated heater cord. No braid on individual conductors but with braid overall. Also made with neoprene insulation and no asbestos or PVC/NBC. HPN: Two-conductor, neoprene-insulated heater cord. Parallel construction. For use in damp locations. HSJ: Same as type HS but with #18, #16 and #14 conductors and differing thickness of jacket. HVAC: Heating, ventilation and air conditioning Hz: Hertz i: Symbol used to designate current IC: Intermediate cross-connect ICEA: Insulated Cable Engineers Association IDC: Insulation Displacement Connector IEC: Internation Electrotechnical Commission IEEE: Institute of Electrical and Electronics Engineers IGS: Integrated Gas Spacer Cable, NEC Article 325 Cable Designation IMSA: International Municipal Signal Association in: Inch IRSG: Internet Research Steering Group IRTF: Internet Research Task Force IS: International Standard ISA: Instrument Society of America ISDN: Integrated Services Digital Network ISO: International Organization for Standardization ISOC: Internet Society ITCO: Independent Telephone Company ITU-T: International Telecommunications Union - Telecommunications Standardization Section IW (C): Inside Wiring (cable) J: Joule kcmil: One thousand circular mils KEMA KEUR: Approval agency of the Netherlands kft: An abbreviation for 1000 ft. kHz: Kilohertz Kilo: A numerical prefix denoting 1000 (103) km: Kilometer KTS: Key Telephone Service kV: Kilovolt kVA: Kilovolt Ampere kW: Kilowatt LAN: Local Area Network LASER: Light Amplification by Stimulated Emission of Radiation LATA: Local Access Transport Area lbf: Pound force LBO: Line Buildout LDPE: Low Density Polyethylene LEC: Local Exchange Carrier LED: Light-Emitting Diode LLDPE: Linear Low Density Polyethylene LOCA: Loss of Coolant Accident locap: Low-capacitance, low-loss paired cable MAC: Moves, Adds and Changes MAP: Manufacturing Automation Protocol MATV: Master Antenna Television Mbps: Megabits per second MC: (1) main cross-connect (2) Metal Clad Cable, NEC Article 334 Cable Designation MCM: One thousand circular mils MDF: Main Distribution Frame MDPE: Medium Density Polyethylene Meg or Mega: A numerical prefix denoting 1,000,000 (106) M/G: Motor/Generator Set MH: Manhole Mho: The unit of conductivity. The reciprocal of an ohm. MHz: Megahertz MI: Mineral Insulated Cable, NEC Article 330 Cable Designation Micro: A numerical prefix denoting one-millionth (106) MIL STD: Military Standard MILNET: Military Network MLT: Multi-Level Threshold mm: Millimeter Modem: Modulator demodulator MTT: Main Telephone Terminal MTW: Machine Tool Wire MV: Medium Voltage Cable, NEC Article 326 Cable Designation MW: Radio hookup wire with polyvinyl insulation and plain or nylon jacket or braid, or shield, 1000V N: Newton NAIC: Network Applications and Information Center NASA: National Aeronautics and Space Administration NBR: Natural butadiene-acrylonitrile copolymer rubber NBS: National Bureau of Standards (now NIST) NEC: National Electrical Code NEMA: National Electrical Manufacturers Association NEMKO: Approval agency of Norway NESC: National Electrical Safety Code NEXT: Near End Crosstalk nf: Nanofarad NFPA: National Fire Protection Association NI: Network Interface NID: Network Interface Device NIST: National Institute of Standards and Technology (formerly NBS) NIU: Network Interface Unit nm: Nanometer NM & NMC: Non Metallic Sheathed Cable, NEC Article 336 Cable Designation NPLF: Non Power-Limited Fire Protective Signaling Circuit Cable, NEC Article 760 Cable Designation NPLFP: Non Power-Limited Fire Protective Signaling Circuit Plenum Cable, NEC Article 760 Cable Designation NPLFR: Non Power-Limited Fire Protective Signaling Circuit Plenum Cable, NEC Article 760 Cable Designation NRZ: Non Return to Zero NRZI: Non Return to Zero Inverted OC: Optical Carrier ODC: Ozone Depleting Chemical OP: Outside Plant OPE: Outside Plant Engineer OSHA: Occupational Safety and Health Administration OSI: Open Systems Interconnection OVE: Approval agency of West Germany; Oesterreichischer Verband fur Elektrotechnik PABX: Private Automatic Branch Exchange PAM: Pulse Amplitude Modulation PAP: A commonly used term for air core (unfilled) direct burial telephone cable with a corrugated aluminum shield PBX: Private Branch Exchange PC: Personal Computer PCB: Printed Circuit Board P-FEP: General Cable proprietary dielectric material used injunction with FEP. PCM: Pulse Code Modulation PCP: A commonly used term for air core (unfilled) direct burial cable with a corrugated copper shield PE: Polyethylene pf: Picofarad PFA: Polyfluoroalkoxy PIC: A general term for any type of plastic insulated telephone cable Pico: A numerical prefix denoting one-millionth of one-millionth (10-12) PL: Private Lines PLSJ: All-rubber, parallel-jacketed, two- conductor, light-duty cord for pendant or portable use in damp locations. 300V. PLT: (1) Plant (2) Same as PLSJ except thermo- plastic insulation PLTC: Power Limited Tray Cable, NEC Article 725 Cable Designation PM: Phase Modulation POI: Point Of Interface POSJ: All-rubber, parallel, light duty rip-cord for use on lamps and small appliances, 300V, 60°C POT: Thermoplastic, parallel, light duty rip-cord. 300V, 60°C to 105°C. POTS: Plain Old Telephone Service (colloquial) PP: Polypropylene PR: Pair PTFE: Polytetrafluoroethylene PTSS: Passive Transmission Sub-System PVC: Polyvinyl Chloride PVDF: Polyvinylidene Fluoride R: Symbol for resistance R-F: Radio-frequency RCDD: Registered Communication Distribution Designer REA: Rural Electrification Administration REP: Repair RFQ: Request for Quote RG/U: General utility grade military coaxial cable RH: Relative humidity RJ-45: A specific pin-point assignment for an eight position modular telecommunications connector. RMS: (1) rack mount space (2) Root Mean Squares RoHS: Restriction on Hazardous Substances S: Heavy-duty, rubber-insulated portable cord. Stranded copper conductors with separator and individual rubber insulation. Two or more color- coded conductors cabled with filler, wrapped with separator and rubber jacketed overall, 600 Volts. SAE: Society of Automotive Engineers SANZ: Standards Association of New Zealand SBR: Styrene Butadiene Rubber ScTP: Screened Twisted Pair SDN: Switched Digital Network Technical Information 192