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