ALMA Acronyms Jan 16, 2024

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A newer version (March 15, 2024) is available on AEDM

Number   A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z     

Acronyms starting with a Number

  • 10RD : 10 MHz reference distribution circuitry
  • 125RD : 125 MHz reference distribution circuitry
  • 2GC : Second Generation Correlator. See ATAC.
  • 2SB : Dual -SideBand
  • 2xBW : Two -Times Bandwidth (with respect to the original ALMA IF bandwidth)
  • 3R: Regenerate, Reshape, Retiming
  • 4xBW : Four -Times Bandwidth (with respect to the original ALMA IF bandwidth)
  • 5RD : 5 MHz reference distribution circuitry
  • 7M: Seven Meter

    Acronyms starting with a A

  • A/D : Analog to digital conversion
  • A/E : Alcatel/EIE
  • AA: Antenna Article
  • AAB : Antenna Assembly Building
  • AAWG : Athermal Arrayed Waveguide Grating
  • ABM : Antenna Bus Master
  • AC / a.c. : Alternating Current
  • ACA : Atacama Compact Array
  • ACAC : Atacama Compact Array Correlator
  • ACAS : ACA Spectrometer
  • ACC : ALMA Coordinating Committee
  • ACC : Array Control Computer
  • ACCn : Antenna Acceptance Unit #n
  • ACCn : Antenna Transporter Acceptance Unit #n
  • ACD : Amplitude Calibration Device
  • ACE : Adaptive Communication Environment
  • ACE : Alcatel/Costamasnaga/EIE
  • ACSH : Chilean Safety Association (acronym from Spanish initials)
  • ACK : Acknowledge
  • ACMIN : ACA Correlator Manufacturing Issues and NCRs
  • ACRV : Acceptance Review
  • ACRVn : Acceptance Review Antenna Unit #n
  • ACS : ALMA Common Software
  • ACU : Antenna Control Unit
  • AD: ALMA Director; used mainly in organizational charts/discussions.
  • AD: Applicable Document
  • ADAPT : ALMA Data Processing Toolkit
  • ADC : Analog to Digital Conversion (or Converter)
  • ADC : ALMA Department of Computing
  • ADD : ALMA Deputy Director. See ADD -Dev and ADD -Ops.
  • ADD -Dev : ALMA Deputy Director for Development
  • ADD -Ops : ALMA Deputy Director for Operations
  • ADE : ALMA Department of Engineering
  • ADMIT : ALMA Data Mining Toolkit
  • ADO : ALMA Directors Office
  • ADP : Acceptance Data Package
  • ADR : Acceptance Discrepancy Report
  • ADnn / AD[nn] : Applicable Document No. nn
  • AE: Antenna Element
  • AEC : Active Electrical Cable (400GbE)
  • AEC : ALCATEL EIE Consortium
  • AEC : ALMA Executive Committee
  • AEDM : ALMA Electronic Document Management system
  • AEG : Antenna Evaluation Group
  • AEM : Alcatel Alenia Space, European Industrial Engineering, MT Aerospace
  • AFA : ALMA Frontend Archive
  • AFSPU : ALMA Frequency Slice Processor Unit
  • AGC : Automatic Gain Control
  • AGN : Active Galactic Nucleus
  • AHU : Air Handling Unit
  • AIA : Atmospheric Imaging Assembly (Solar Dynamics Observatory)
  • AI: Action Item
  • AIL: Action Item List
  • AIPCn : Assembly Inspection Point Chile of Antenna Transporter #n
  • AIPS : Astronomical Image Processing System
  • AIV: Assembly, Integration, and Verification
  • AIVC : Assembly, Integration, Verification and Commissioning
  • AJ: Anti -Jam
  • ALC : Automatic Level Control
  • ALF : Administration, Logistics, and Facility (Management)
  • ALMA : Atacama Large Millimeter/submillimeter Array
  • AM: Amplitude Modulation
  • AMAC : ALMA Management Advisory Committee
  • AMAPOLA : Analysis Matrix for ALMA Polarimetry
  • AMB : Antenna Monitor and Control Bus
  • AMC : Active Multiplier Chain
  • AMBSI : ALMA Monitor and Control Bus Standard Interface
  • AMG : Array Maintenance Group
  • AMS : Antenna Mount System
  • AMT : ALMA Management Team
  • ANASAC : ALMA North America Science Advisory Committee
  • ANATAC : ALMA North America Technical Advisory Committee
  • ANSI : American National Standards Institute
  • ANT : Antenna Subsystem. See ANTE.
  • ANTE : Prefix for Antenna documents
  • AOC : Array Operations Center (in Socorro, New Mexico)
  • AoD : Astronomer on Duty
  • AOG : Array Operations Group within DSO
  • AOPG : Array Operations Performance Group within DSO. Combines
  • the old APG and OPG.
  • AOS : Array Operation Site
  • AOSTB : Array Operation Site Technical Building
  • APA : AQUA Pipeline Agent
  • APC : Angled Physical Contact
  • APD : Angled Polished Connector
  • APDM : ALMA Project Data Model
  • APE : ALMA Production Environment
  • APEW : ALMA Production Environment Wideband sensitivity upgrade
  • APEX : Atacama Pathfinder EXperiment
  • APG : Array Performance Group within DSO
  • API: Application Programming Interface
  • APMS : Array Performance Modeling System
  • APO : Archive and Pipeline Operations group
  • APP : ALMA Phasing Project
  • APRC : ALMA Proposal Review Committee
  • APS : ALMA Phasing System
  • AQ: ASA Query
  • AQUA : ALMA Quality Assurance software
  • AR: Angular Resolution
  • ARC : ALMA Regional Center
  • ARM : Array Runtime Manager (replacement of OMC)
  • ARTM : ALMA Real Time Machine
  • ASA : ALMA Science Archive
  • ASAC : ALMA Science Advisory Committee
  • ASC : ALMA Sensitivity Calculator
  • ASC : ALMA Support Center
  • ASCII : American Standard Code Information Interchange
  • ASD : Allan Standard Deviation
  • ASDM : ALMA Science Data Model
  • ASDy : Allan Standard Deviation of variable y
  • ASHRAE : American Society of Heating, Refrigerating and Air -
  • Conditioning Engineers
  • ASIAA : Academia Sinica Institute of Astronomy &
  • Astrophysics
  • ASIC : Application Specific Integrated Circuit
  • ASL / a.s.l : Above Sea Level
  • ASTE : Atacama Submillimeter Telescope Experiment
  • ASTM : American Society for Testing and Materials
  • ASTR : ALMA System Technical Requirements
  • AT: Array Time
  • ATAC : Advanced Technology ALMA Correlator
  • ATC : Advanced Technology Center, NAOJ
  • ATCA : Australian Telescope Compact Array
  • ATF : ALMA Test Facility
  • ATM : Atmospheric Transmission at Microwaves
  • AUI : Attachment Unit Interface, a type of Ethernet connector
  • AUI : Associated Universities, Inc.
  • AUXR : Auxiliary Rack
  • AVCCU : ALMA Very Coarse Channelizer Unit
  • AWE : ALMA Work Element
  • AWG : American Wire Gauge
  • AWG : Arrayed Waveguide Grating
  • AWGN : Additive White Gaussian Noise
  • AXIoE : Advanced eXtensible Interface over Ethernet
  • AZ: Azimuth (values defined as zero to North)

    Acronyms starting with a B

  • B2B : Band -to-Band
  • BACI : Basic Control Interface
  • BB: Baseband
  • BBDC : Baseband Delay Correction
  • BBn : Baseband n (with n from 1 to 4)
  • BBP : Baseband Pair
  • BCR : Budget Change Request
  • BDF : Binary Data Format
  • BE: Backend
  • BEAST : Beam Scanner Test Source
  • BEND : Prefix for Backend documents
  • BER : Bit Error Rate
  • BGA : Ball Grid Array
  • BiCMOS : Bipolar Complementary Metal -Oxide -Semiconductor
  • BIST : Built -In Self Test
  • BL: Baseline
  • BLC : BaseLine Correlator
  • BMC : Board Management Controller
  • BOM : Bill of Materials
  • BPF : Band Pass Filter
  • BSP : Board Support Package
  • BTU : British Thermal Unit
  • BUS : Back -up Structure
  • BW: BandWidth
  • BWFN : Beam Width between First Nulls
  • BWSW : Bandwidth Switching

    Acronyms starting with a C

  • CADC : Canadian Astronomy Data Centre
  • CAI: Correlator Antenna Input
  • CAN : Controller Area Network
  • CARTA : Cube Analysis and Rendering Tool for Astronomy
  • CAS : Cost Accounting Standard
  • CASA : Common Astronomy Software Applications package
  • CBF : Correlator and Beam -Former
  • CBI: Cosmic Background Imager
  • CCA : Cold Cartridge Assembly
  • CCB : Change Control Board
  • CCC : Correlator Control Computer
  • CCIR : Consulative Committee on Radio Interference
  • CCL : Control Command Language
  • CD: Chromatic Dispersion
  • CDC : Clock Domain Crossing
  • CDL : Central Development Laboratory (NRAO Charlottesville)
  • CDMA : Code Division Multiple Access
  • CDMR : Critical Design and Manufacturing Readiness Review
  • CDP : Correlator Data Processor
  • CDPC : Correlator Data Processing Computer
  • CDPM : Correlator Data Processing Master
  • CDR : Critical Design Review
  • CDU : Coolant Distribution Unit
  • CE: Conformité Europeenne
  • CEB : Central Electronics Building
  • CEE : Commission internationale de réglementation en vue de l’approbation de l’Équipment Électrique (International Commission on Rules for the Approval of Electrical Equipment, currently IECEE).
  • CEN : European Standards Coordinating Committee
  • CENELEC : European Committee for Electrotechnical Standardisation
  • CFD : Computational Fluid Dynamics
  • CFHT : Canada France Hawaii Telescope
  • CFM : Cubic Feet per Minute
  • CFP : 100G Form factor Pluggable
  • CFRP : Carbon Fiber Reinforced Plastic
  • CFT/CfT : Call for Tender
  • CI: Configuration Item
  • CIDL : Configuration Items Data List
  • CIP: Correlator and Integration Processor
  • CIRA : Cooperative Institute for Research in the Atmosphere
  • CIRM : Configuration Item Responsibility Matrix
  • CISPR : Comité International Spécial des Perturbations
  • Radioélectriques
  • CLAI : Cluster/ADAPT Interface
  • CLNA : Cold Low Noise Amplifier
  • CLO : Central Local Oscillator
  • CLOA : Central Local Oscillator Article
  • CLT : Chilean Local Time
  • CMAC : Complex Multiplier Accumulator
  • CME : Coronal Mass Ejection
  • CMMS : Computerized Maintenance Management System
  • CMP : Control and Monitor Processor
  • CMPR : Compressor
  • CMT : Core Management Team (JAO)
  • CMV : Common Mode Voltage
  • CNC : Computer Numerical Control
  • CoDR : Conceptual Design Review
  • CoG : Center of Gravity
  • CoM : Center of Mass
  • COMP : Prefix for Computing documents.
  • CONICYT : National Commission for Research in Science and Technology
  • CORBA : Common Object Request Broker Architecture
  • CORL : Prefix for Correlator documents (sometimes CORR)
  • CORR : Correlator card
  • CoSDD : Conceptual System Design Description
  • COTS : Commercial Off -The -Shelf
  • CPLD : Complex Programmable Logic Device
  • CPR : Cloud Profiling Radar
  • CPS : Centre for the Protection of the Sky (short name for the IAU Centre for the Protection of the Dark and Quiet Sky From Satellite Constellation Interference).
  • CPU : Central Processing Unit
  • CPW : Coplanar Waveguide
  • CR: Change Request
  • CRAH : Computer Room Air Handling
  • CRD : Central Reference Distributor
  • CRE : Change REquest
  • CRG : Central Reference Generator
  • CRR : Control Room Relocation
  • CRS : Central Reference System
  • CRT : Cathode Ray Tube
  • CS: Contact Scientist
  • CSA : Canadian Standards Association
  • CSCG : Control Software Coordination Group
  • CSE : Clock Set Event
  • CSIC : Consejo Superior de Investigaciones Científicas
  • CSPFB : Critically -Sampled Polyphase Filter Bank
  • CSS: Cascading Style Sheets
  • CSV : Commissioning and Science Verification
  • CSV : Comma Separated Values
  • CTA : Cherenkov Telescope Array
  • CTAO : Cherenkov Telescope Array Observatory
  • CTE : Coefficient of Thermal Expansion
  • CTI: Comparative Tracking Index
  • CTIO : Cerro Tololo Inter -American Observatory
  • CTNLL : Calibrated Tunable Narrow -Linewidth Laser
  • CTS : Cartridge Test System
  • CVR : Central Variable Reference
  • CVRR : Central Variable Reference Rack
  • CVS : Concurrent Version System
  • CW: Continuous Wave
  • CWG : Chajnantor Working Group
  • CWS : Central Weather Station

    Acronyms starting with a D

  • DAC : Digital to Analog Convertor
  • DAC : Direct Attach Copper (400GbE cable)
  • DAO : Data Access Object
  • DAPR : Distributed ALMA Proposal Review
  • DAR : Document Approval Request
  • dB: Decibel
  • dBc : Decibels referenced to the Carrier
  • DC (also d.c.) : Direct Current
  • DC: Director's Council
  • DCI: Data Center Interconnects
  • DCLC : Direct Contact Liquid Cooling
  • DCO : Digital Coherent Optics
  • DDC : Direct Digital Controller
  • DDC : Digital Down Converter
  • DDL : Deliverable Document List
  • DDP : Detailed Design Phase
  • DDR : Double Data Rate
  • DDS : Direct Digital Synthesizer
  • DDT : Director's Discretionary Time
  • DEC : Declination
  • DFB : Distributed Feedback (laser)
  • DFP : DTS -Rx and FFT Processor
  • DG: Director General
  • DG: Digitizer (assembly)
  • DGC : Differential Gain Calibration
  • DGCK : Digital Clock
  • DGD : Digitizer Demultiplexer
  • DGS : Digitizer Sampler
  • DHC : Data Handling Computer
  • DiFX : Distributed FX correlation
  • DIN : Deutsche Industrie Norm
  • DLL : Delay Locked Loop
  • DMA : Decision Making Authority
  • DMC : DTRS -R Monitor and control Computer
  • DMG : Data Management Group within DSO
  • DMR : Laser synthesizer microwave reference
  • DMUX : Demultiplexer
  • DNL : Differential Non Linearity
  • DOM : Digital Optical Monitoring
  • DPCG : Data Processing Coordination Group
  • DPDK : Data Plane Development Kit
  • DPR : Distributed Peer Review
  • DPS : Distributed Processing System
  • DR: Data Reducer
  • DR: Dynamic Range
  • DR: Director's Representative
  • DRAO : Dominion Radio Astronomy Observatory
  • DRD : Document Requirement Description
  • DRL : Documentation Requirements List
  • DRM : Data Reduction Manager
  • DRX : Data Receiver module
  • DSA : Dynamic Scheduling Algorithm
  • DSAA : Division of Science and Academic Affairs
  • DSB : Double Sideband
  • DSI: Data Science Initiative
  • DSO : Division of Science Operations
  • DSP : Digital Signal Processing
  • DSPOT : Digital Signal Processing and Optical Transmission
  • DTS : Data Transmission System
  • DTS -Rx: Data Transmission System Receiver
  • DTX : Data Transmitter LRU
  • DWDM : Dense Wavelength Division Multiplexer
  • DWG : Drawing
  • DWGnn : Applicable Drawing nn
  • DYTO : Digitally -tuned YIG Tuned Oscillator

    Acronyms starting with a E

  • E2C : Ethernet to CAN
  • E2E : End to End
  • EA: East Asia
  • EAASC : East Asia ALMA Support Center
  • EACC : Extended ALMA Coordinating Committee
  • EASAC : East Asian Scientific Advisory Committee
  • EASC : European ALMA Support Centre
  • EB: Execution Block
  • EBPL : Earthing, Bonding and Protection against Lightning
  • ECDL : External Cavity Diode Laser
  • ECSS : European Cooperation for Space Standardization
  • EDFA : Erbium Doped Fiber Amplifier
  • EDM : Electronic Document Management system
  • EEC : European Economic Community
  • EEE : Electrical, Electronic, Electromechanical
  • EF: Execution Fraction
  • EFC : Electronic Frequency Control
  • EHT : Event Horizon Telescope
  • EIA: Electronics Industries Alliance
  • EICD : External Interface Control Document. See IICD.
  • EIE: European Industrial Engineering (partner with Alcatel Elenia Space)
  • EL: Elevation
  • EM: Electromagnetic
  • EMC : Electromagnetic Compatibility
  • EMI : Electromagnetic Interference
  • EN: European Norm
  • ENOB : Effective Number Of Bits
  • EOC : Extension and Optimization of Capabilities
  • EOL : End of Life
  • EOP : Earth Orientation Parameters
  • EPC : Engineering Procurement and Construction
  • EPO : Education and Public Outreach
  • ER: Extended Reach (optical fiber transmission specification, <40km, 1550nm)
  • ES: Early Science
  • ESAC : ALMA European Science Advisory Committee
  • ESG : Engineering Services Group
  • ESO : European Southern Observatory
  • EU: European Union
  • eVLBI : electronic Very Long Baseline Interferometry

    Acronyms starting with a F

  • F2F : Face to Face
  • FA: Final Adder
  • FBG : Fiber Bragg Grating
  • FDM : Frequency Division Mode
  • FE: Frontend
  • FEC : Forward Error Correction
  • FEMC : Front End Monitor and Control
  • FEND : Prefix for Front -End documents
  • FEP : Fluorinated Ethylene Propylene
  • FEPS : Front End Power Supply
  • FESS : Front -End Support Structure
  • FESV : Front End Service Vehicle
  • FET : Field Effect Transistor
  • FETMS : Front End Test and Measurement System
  • FFS: Fiber Frequency Shifter
  • FFT : Fast Fourier Transform
  • FFX : Frequency division / Fourier transform / Correlation (correlator architecture type)
  • FIFO : First -In First -Out
  • FinFET : Fin Field Effect Transistor
  • FIT: Failures In Time (failures in 1×10⁹ hours)
  • FITS : Flexible Image Transport System
  • FL: Fiber Laser
  • FLOOG : First LO Offset Generator
  • FM: Factory Mutual system
  • FM: Faraday Mirror
  • FMEA : Failure Mode Effects Analyses
  • FMECA : Failure Mode, Effects, and Criticality Analysis
  • FO: Fully Observed
  • FOAD : Fiber Optics Amplifier and Multiplexer
  • FOM : Fiber Optic Multiplexer
  • FOTS : Fiber Optic Transmission System
  • FOV : Field of View
  • FOW : Fiber Optic Wrap
  • FP: Focal Plane
  • FPGA : Field -Programmable Gate Array
  • FPS : Frequency Profile Synthesis
  • FRM : Faraday Rotator Mirror
  • FSBL : First Stage Boot Loader
  • FSL: Fast lane Slow Lane
  • FSP : Frequency Slice Processor
  • FSR : Full System Restart
  • FT: Fourier Transform
  • FTA : Fault Tree Analysis
  • FTE : Full Time Equivalent
  • FTS : Fine Tuning Synthesizer
  • FW: Firmware
  • FW: Freewheeling (mode of NTP)
  • FWBN : Full Width Between the Nulls
  • FWHM : Full Width Half Maximum
  • FWHP : Full Width Between the Nulls
  • FX: Fourier transform / Correlation (correlator architecture type)
  • FXF : Frequency division / Correlation / Fourier transform (correlator architecture type)

    Acronyms starting with a G

  • GARD : Group for Advanced Receiver Development (Onsala Space Observatory)
  • GBT : Green Bank Telescope
  • GigE : Gigabit Ethernet
  • GJinc : Gaussian times Bessel function of the first kind (gridding kernel)
  • GMVA : Global Millimeter VLBI Array
  • GNS : General Network Services
  • GOUS : Group Observing Unit Set
  • GPS : Global Positioning System
  • GPU : Graphic Processing Unit
  • GUI : Graphical User Interface

    Acronyms starting with a H

  • HA: Hour Angle
  • HAA : Herzburg Astronomy and Astrophysics (Canada)
  • HALT : Highly Accelerated Life Test
  • HBM : High Bandwidth Memory
  • HDD : Hard Disk Drive
  • HDL : Hardware Description Language
  • HDPE : High Density Poly Ethylene
  • HEMT : High Electron Mobility Transistor
  • HFET : Hetero -structure Field Effect Transistor
  • HILSE : Hardware In the Loop Simulation Environment
  • HM: Harmonic Mixer
  • HM: Hydrogen Maser
  • HPBW : Half Power Beam Width
  • HRAG : Human Resources Advisory Group
  • HSE : ALMA Safety and Environmental Department
  • HV: High Voltage
  • HVAC : Heating, Ventilation and Air conditioning
  • HW : Hardware

    Acronyms starting with a I

  • IAS: Integrated Alarm System
  • IAU : International Astronomical Union.
  • IC: Imaging Correlation mode
  • ICCU : Inside Compressor Control Unit
  • ICD: Interface Control Document
  • ICP: Inductively Coupled Plasma
  • ICRS : International Coordinate Reference System
  • ICT: Integrated Computing Team
  • ICU: Indoor Compressor Unit
  • IDT : Integrated Development Team
  • IEC: International Electrotechnical Commission
  • IEV: International Electrotechnical Vocabulary
  • IEEE : Institute of Electrical and Electronics Engineers
  • IERS : International Earth Rotation Service
  • IET: Integrated Engineering Team
  • IF: Intermediate Frequency
  • IFAB : Innovations in Fabrication (a Multifunctional Microfabrication
  • and Scalable Biomanufacturing Facility at University of Virginia)
  • IFDC : Intermediate Frequency Down Converter
  • IFP: Intermediate Frequency Processor
  • IFS: Intermediate Frequency Switch
  • IICD : Internal Interface Control Document. See EICD.
  • IID: Interface Identification Document
  • IL: Insertion Loss
  • ILS: Integrated Logistics Support
  • IMG : Infrastructure Maintenance Group
  • IMOP : Integrated Maintenance and Operation Plan
  • INAF : Istituto Nazionale di Astrofísica (Italian National Institute for Astrophysics)
  • INTF : Correlator Interface Card
  • IOM : Interferometry Observing Mode
  • IP: Ingress Protection Ratings
  • IPMI : Intelligent Platform Management Interface
  • IPT: Integrated Product Team
  • IRAM : Institut de Radioastronomie Millimetrique (Franco -German - Hispanic Institute for Radio Astronomy)
  • IRD : Interface Requirement Document
  • IRM : Integration and Release Management
  • IRR : Image Rejection Ratio
  • IRS: Integrated Reporting System
  • ISFA : Indoor Sport Facility at ALMA OSF
  • ISM : Industrial, Scientific and Medical
  • ISM : International Staff Member
  • ISM : InterStellar Medium
  • ISO: International Standardisation Organisation
  • IST: Integrated Science Team
  • ISOpT : Integrated Science Operations Team
  • IT: Information Technology
  • ITE: Information Technology Equipment
  • ITF: Integration Test Facility (at NRAO -Charlottesville)
  • ITU : International Telecommunication Union
  • IUCAF : Scientific Committee on Frequency Allocations for Radio Astronomy and Space Science
  • IVS: International VLBI Service
  • IXT: Integrated Teams (incl. Science, Science Operations,
  • Engineering and Computing)

    Acronyms starting with a J

  • JAO : Joint ALMA Observatory
  • JCMT : James Clerke Maxwell Telescope
  • JDT : JAO Development Team
  • JOSEFA : Jumpered Optical Splitter External Fiber Assembly
  • JP: Joint Proposal
  • JPL: Jet Propulsion Laboratory
  • JWST : James Webb Space Telescope

    Acronyms starting with a K

  • KASI : Korea Astronomy and Space Science Institute
  • KB: Knowledge Base
  • KPI: Key Performance Indicator
  • KVN : Korean VLBI Network

    Acronyms starting with a L

  • LAB : Laboratoire d'astrophysique de Bordeaux
  • LAS : Largest Angular Scale
  • LAVA : Labor -saving Added Value Automation
  • LEMP : Lightning Electromagnetic Pulse
  • LEO : Low Earth Orbit
  • LFR : Low Frequency Reference
  • LFRD : Low Frequency Reference Distributor
  • LFTRR : Low Frequency Timing Reference Receiver
  • LLC : Line Length Corrector
  • LLCR : Line Length Corrector Rack
  • LMC : Line length corrector Monitor & control Computer
  • LNA : Low Noise Amplifier
  • LNF : Low Noise Factory
  • LO: Local Oscillator
  • LO1 : First LO
  • LO2 : Second LO
  • LO3 : Digitizer Clock LO, Third LO
  • LO4 : Tunable Filterbanks LO, Fourth LO
  • LoRaWAN : Long Range Wide Area Network
  • LORR : LO Reference Receiver
  • LORTM : Local Oscillator Reference Test Module
  • LP: Low Pass
  • LPG : Liquefied Petroleum Gas
  • LPR : LO Photonics Receiver
  • LR: Long Reach (optical fiber transmission specification, <10km, 1310nm)
  • LRM : Long Reach Multimode (optical fiber transmission specification, <220m, 1310nm)
  • LRU : Line Replaceable Unit
  • LS: Laser Synthesizer
  • LSA : Large Southern Array
  • LSB : Lower SideBand (signal chain context)
  • LSB : Least Significant Bit (computing context)
  • LSR : Local Standard of Rest
  • LST : Local Sidereal Time
  • LSRK : Local Kinematics Standard of Rest
  • LTA : Long Term Accumulator
  • LUT : Look Up Table
  • LV: Low Voltage
  • LVD : Low Voltage Directive
  • LVDC : Low Voltage Direct Current (power supply)
  • LVDS : Low Voltage Differential Signalling
  • LVTTL : Low Voltage Transistor -Transistor Logic

    Acronyms starting with a M

  • M&C : Monitor and Control
  • masl : meters above sea level
  • MCI : Monitor and Control Interface
  • MCM : Monitor & Control Manager
  • MD: Mixed De -Tuned or Mixed De -Biased mode
  • MDS : Meta Data Service (of Lustre file system)
  • MDT : Mean Maintenance Downtime
  • MELCO : Mitsubishi Electric Corporation
  • MFS : Master Frequency Standard
  • MFS : Multi -frequency Synthesis
  • MIT : Massachusetts Institute of Technology
  • ML: Master Laser
  • MLD : Master Laser Distributor
  • MLE : Maximum Likely Earthquake
  • MLI : Multi Layer Insulation
  • MMA : Millimeter Array
  • MMEX : Manual Mode Execution
  • MMF : Multi Mode Fiber
  • MMIC : Monolithic Microwave Integrated Circuit
  • MOM : Minutes of Meeting
  • MOST : Ministry of Science and Technology (in Taiwan)
  • MOTS : Modified Off -the-Shelf
  • MOUS : Member Observing Unit Set
  • MPI : Max -Planck -Institut (German Max Planck Institute)
  • MPI : Message Passing Interface
  • MPIfR : Max -Planck -Institut für Radioastronomie (German Max -Plan Institute for Radioastronomy)
  • MQTT : Message Queueing Telemetry Transport
  • MR: Missing Requirement
  • MR: Microwave Reference
  • MRB : Material Review Board
  • MRR : Manufacturing Readiness Review
  • MRS : Maximum Recoverable Scale
  • MS: Measurement Set
  • MSDS : Material Safety Data Sheet
  • MTBF : Mean Time Between Failures
  • MTBM : Mean Time Between Maintenance
  • MTCE : Maintenance
  • MTMFS : Multi -Taylor Multi -Frequency Synthesis
  • MTTF : Mean Time To Failure
  • MTTR : Mean Time to Repair
  • MTTS : Mean Time To Service
  • MV: Medium Voltage

    Acronyms starting with a N

  • NA: North America
  • NAASC : North America ALMA Science Center
  • NAATAC : North America ALMA Technical Advisory Committee
  • NAOJ : National Astronomy Observatory Japan
  • NCAC : NRAO Correlator Advisory Committee
  • NCR : Non -Conformance Report
  • NDA : Non -Disclosure Agreement
  • NDT : Non -Destructive Testing
  • NEC : National Electric Code
  • NEMA : National Electrical Manufacturers Association
  • nFA : new Final Adder
  • NFPA : National Fire Protection Association
  • NGAS : New Generation Archive System
  • NGSO : Non Geostationary Orbit
  • NIC: Network Interface Card
  • NINS : National Institute of Natural Sciences (Japan)
  • NOVA : Netherlands Research School for Astronomy
  • NRAO : National Radio Astronomy Observatory
  • NRC : National Research Council (Canada)
  • NRE : Non -Recurring Engineering
  • NSC : National Science Council (of Taiwan)
  • NSF : National Science Foundation (of USA)
  • NTC : NRAO Technology Center
  • NTP : Network Time Protocol
  • NTPS : Network Time Protocol Server
  • NVME : Non -Volatile Memory Express (data storage)
  • NVSS : NRAO VLA Sky Survey

    Acronyms starting with a O

  • OBPF : Optical Bandpass Filter
  • OCRO : OSF Correlator Room
  • OCU : Outdoor Compressor Unit
  • OCXO : Oven Controlled crystal Oscillator
  • ODS : Operational Data Sharing
  • ODF : Optical Diplexer Filter
  • OEM : Original Equipment Manufacturer
  • OFAV : Off -site Assembly, integration and Verification
  • OFLS : Optical Fiber Link System
  • OKR : Objectives and Key Results
  • OMC : Operator Monitoring and Control
  • OMT : Ortho -mode Transducer
  • OOK : On Off Keying
  • OPC : Open Platform Computing
  • OPCUA : Open Platform Communications Unified Architecture
  • OPFB : Oversampled Polyphase Filter Bank
  • OPG : Operations Performance Group within DSO
  • OPT : Optical Pointing Telescope
  • ORB : Object Request Broker
  • OS: Operating System
  • OSF : Operations Support Facility
  • OSHA : Occupational Safety and Health Administration
  • OSI: Open Systems Interconnection
  • OSPFB : Over -Sampling Polyphase Filter Bank
  • OST : Observation Support Tool
  • OT: Observing Tool
  • OTDR : Optical Time Domain Reflectometer
  • OTF : On the Fly
  • OUS : Observing Unit Set

    Acronyms starting with a P

  • P2G : Phase 2 Generation
  • P2G : Phase 2 Group
  • PA: Product Assurance
  • PAA : Parque Astronómico de Atacama
  • PAI: Provisional Acceptance In -house
  • PAM : Pulse Amplitude Modulation
  • PAS : Provisional Acceptance at Site
  • PB: Primary Beam
  • PBS : Polarization Beam Splitter
  • PC: Polarization Controller
  • PCB : Printed Circuit Board
  • PCS : Polarization Calibration Source
  • PCTJ : Parallel Connected Twin Junction
  • PD: Person Day
  • PDC : Product Design Code
  • PDD : Product Design Deliverable
  • PDD : Performance and Development Dialog
  • PDL : Polarization Dependent Loss
  • PDM : Propagation Delay Measure
  • PDR : Preliminary Design Review
  • PDU : Power Distribution Unit
  • PAFS : Perfluoroalkyl and Polyfluoroalkyl Substances
  • PFB : Polyphase Filter Bank
  • Ph1M : Phase 1 Manager
  • PHS&T : Packaging, Handling, Storage & Transportation
  • PHT : Proposal Handling Team
  • PI: Principal Investigator
  • PIC: Phasing Interface Card
  • PL: Programmable Logic
  • PLDM : Platform Level Data Model
  • PLL : Phase -Locked Loop
  • PLO : Photonic Local Oscillator
  • PLUG : Pipeline User's Guide
  • PLWG : Pipeline Working Group
  • PM: Polarization Maintaining
  • PM: Photomixer
  • PM: Preventive Maintenance
  • PMC : Polarization Maintaining Coupler
  • PMD : Polarization Mode Dispersion
  • PMG : Program Management Group within DSO
  • PMR : PipelineMakeRequest
  • PO: Pending Other
  • PoC : Point of Contact
  • PP: Patch Panel
  • PPB : Pixels Per Beam
  • PPE : Personal Protective Equipment
  • PPLN : Periodically Poled Lithium Niobate
  • PPR : Pipeline Processing Request
  • PPS : Permanent Power System
  • PPS : Power Plant System
  • PPS : Pulse Per Second
  • PPU : Power Pack Unit (antenna transporter)
  • PQA : Product Quality Assurance
  • PR: Photonic Reference
  • PRD : Photonic Reference Distribution
  • PRDR : Photonic Reference Distribution Rack
  • ProMo : Product Mover
  • PRR : Photonic Reference Rack
  • PSA : Power Supply for Analog rack
  • PS: Power Station
  • PS: Power Supply
  • PS: Processing System
  • PSCRD : Power Supply for Central Reference Distributor
  • PSD : Power Supply for Digital rack
  • PSF : Point Spread Function
  • PSI: Prototype System Integration
  • PSLLC : Power Supply for Line Length Corrector
  • PSSAS : Power Supply for Subarray Switch
  • PT: Power Team
  • PT: Product Tree
  • PT: Project Tracker
  • PTP : Precision Time Protocol
  • PWV : Precipitable Water Vapor
  • PY: Person -Year. See FTE.
  • PZT : Piezo Transducer

    Acronyms starting with a Q

  • QA: Quality Assurance
  • QA0 : Quality Assurance Level 0
  • QA1 : Quality Assurance Level 1
  • QA2 : Quality Assurance Level 2
  • QA3 : Quality Assurance Level 3
  • QASIR : Quality Assurance Service / Inspection Request
  • QCC : Quadrant Control Card
  • QL: QuickLook pipeline
  • QM: Qualification Model
  • QPSK : Quadrature Phase Shift Keying
  • QSFP : Quad Small Form factor Pluggable
  • QSFP -DD: Quad Small Form factor Pluggable Double Density

    Acronyms starting with a R

  • RA: Right Ascension
  • RACI : Responsible, Accountable, Consulted, and Informed.
  • RAM : Random Access Memory
  • RAM : Reliability, Availability, Maintainability
  • RAMS : Reliability, Accessibility, Maintainability and Safety
  • RB: Receiver Band
  • RBD : Reliability Block Diagram
  • RBDA : Reliability Block Diagram Analysis
  • RD: Reference Document
  • RDC : Residual Delay Correction
  • RDHx : Rear Door Heat Exchanger
  • RDMA : Remote Direct Memory Access
  • R/DT : Resampler / Delay Tracker
  • REST : REpresentational State Transfer
  • RF: Radio Frequency
  • RFI: Radio Frequency Interference
  • RH: Request Handler
  • RID : Review Item Discrepancy
  • RIE: Reactive Ion Etching
  • RMI : Remote Method Invocation
  • RMS : Root Mean Square
  • RPAS : Remotely Piloted Aircraft Systems
  • RPC : Rack, Power, and Cooling
  • RR: Radio Regulations (of the ITU)
  • RSS : Root Sum Squared
  • RT: Radiographic Testing
  • RTI -DDS : Real -Time Innovations Data Distribution Service
  • RTO : Return To Operations
  • RTOS : Real -Time Operating System
  • RTR : Remote Transmission Request
  • RUP : Rational Unified Process
  • RX: Receiver

    Acronyms starting with a S

  • SACM : Science Archive Content Manager
  • SAO : Smithsonian Astrophysical Observatory
  • SAR : Successive Approximations Register
  • SAS : Sub Array Switch
  • SASR : Subarray Switch Rack
  • SB: Scheduling Block
  • SBEX : Scheduling Block Execution
  • SC: Source Catalog
  • SCADA : Supervisory Control and Data Acquisition
  • SCC : Station Control Card
  • SCCB : Software Change Control Board
  • SCO : Santiago Central Office
  • SD: Single Dish
  • SDH : Service Discovery Helper
  • SDO : Solar Dynamics Observatory
  • SE: Science Execution
  • SE: Systems Engineering (or Engineer)
  • SED : Spectral Energy Distribution
  • SEF: Site Erection Facility
  • SEFD : Source Equivalent Flux Density
  • SEU : Single Event Upset
  • SF: Spheroidal Function (gridding kernel)
  • SFDR : Spurious Free Dynamic Range
  • SFI: Single Field Interferometry
  • SFN : Secondary Fluid Network
  • SFP : Small Form -factor Pluggable
  • SG: Science Goal
  • SGA : System Global Area
  • SIAP : Simple Image Access Protocol
  • SIS: Scientific Information Services (division of NRAO)
  • SIS: Superconductor -Insulator -Superconductor mixer
  • SISI : Indirect Fire Suppression System (acronym from Spanish>initials)
  • SKA : Square Kilometre Array
  • SKAO : Square Kilometre Array Observatory
  • SL: Slave Laser
  • SL: Stripline
  • SLT : Shift Log Tool
  • SMF : Single Mode Fiber
  • SN: Serial Number
  • SnooPI : Snooping Project Interface
  • SNR : Signal -to-Noise Ratio
  • SOC : Scientific Organizing Committee
  • SoC : System On a Chip
  • SOI: Silicon On Insulator
  • SoM : System on Module
  • SOUS : Science goal Observing Unit Set
  • SOW : Statement of Work
  • Spix : Spectral Index
  • SPR : Software Patch Request
  • spw : Spectral Window
  • spws : Spectral Windows
  • SQLD : Square Law Detector
  • SR: Short Range (optical fiber transmission specification, <300m, 850nm)
  • SRM : Subreflector Manager
  • SRON : Stichting Ruimte Onderzoek Nederland (Netherlands
  • Institute for Space Research)
  • SRR : System (or sub -system) Requirements Review
  • SSAP : Simple Spectral Access Protocol
  • SSB : Single Sideband
  • SSD : Solid State Drive
  • SSG : Subsystem Scientist Group
  • SSLO : Signed Sum of Local Oscillators
  • SSO : Solar System Object
  • SSR : Science Software Requirements
  • STE : Standard Test Environment
  • STI: Site Testing Interferometer
  • ST/PC : Straight Tip / Physical Contact
  • STR : System Technical Requirements
  • SW: Software
  • SWGR : Switch Gear

    Acronyms starting with a T

  • TA: Technical Assessment
  • TAI : International Atomic Time
  • TAO : The ACE ORB
  • TAO : University of Tokyo Atacama Observatory
  • TAP : Table Access Protocol
  • TB: Technical Building
  • TBC : To Be Confirmed
  • TBD : To Be Determined (or Defined)
  • TCI: Time Centroid Index
  • tCLOTS : temporary Central Local Oscillator Test Stand
  • TCP : Transmission Control Protocol
  • TDM : Time Division Mode
  • TDR : Test Data Report
  • TE: Time (or Timing) Event
  • Tebbsky : Effective Blackbody Temperature of the sky
  • TEC : Total Electron Content
  • TEG : Test Element Group
  • TelCal : Telescope Calibration sub -system
  • TFB : Tunable Filter Banks
  • TFB LO : Local Oscillator at the Tunable Filterbanks; LO4,
  • Fourth LO
  • TFINT : Test Facility Interferometer
  • TFSD : Test Facility Single Dish
  • TFTP : Trivial File Transport Protocol
  • THD : Total Harmonic Distortion
  • TL: Technical Lead
  • TLE : Two Line Element
  • TM: Twelve Meter
  • TMCDB : Telescope Monitor and Configuration DataBase
  • ToO : Target of Opportunity
  • ToS : Time on Source
  • TP: Total Power
  • TPA : Total Power Array
  • TPD : Total Power Digitizer
  • TPGS : Total Power GPU Spectrometer
  • TPP : Total Power Processor
  • TPS : Total Power Spectrometer
  • TRL : Technology Readiness Level
  • TRR : Test Readiness Review
  • Trx: Receiver Temperature
  • TSM : Temperature Sensor Module (in CLOA)
  • TSV : Tab Separated Values
  • Tsys : System Temperature
  • TTL : Transistor -Transistor Logic
  • TUV : Technischer Überwachungsverein (Technical Inspection
  • Association)
  • TVG : Test Vector Generator
  • TX: Transmitter
  • TZW : Tunable Zoom Window

    Acronyms starting with a U

  • UDP : User Datagram Protocol
  • UICD : Unit ICD
  • UL: Underwriters Laboratories Incorporated
  • ULC : Underwriters Laboratories Canada
  • UPC : Ultra Physical Contact
  • UPC : Universal Polished Connector
  • UPC : Universal Product Code
  • URR : Upgrade Requirements Review
  • URSI : International Union of Radio Scientists
  • USB : Upper Sideband
  • USB : Universal Serial Bus
  • UT: Ultrasound Test
  • UTC : Coordinated Universal Time/Temps Universel Coordonné
  • UTF : Unicode Transformation Format
  • UTF -8: Unicode Transformation Format 8 -bit encoding
  • UTF -16: Unicode Transformation Format 16 -bit encoding
  • UTM : Universal Transverse Mercator
  • UVML : University of Virginia Microfabrication Laboratories (now part of IFAB)

    Acronyms starting with a V

  • VB: VLBI Beamforming
  • VCC : Very Coarse Channelizer
  • VCO : Voltage Controlled Oscillator
  • VCSEL : Vertical Cavity Surface Emitting Laser
  • VCXO : Voltage Controlled Crystal Oscillator
  • VDE : Verband Deutscher Elektrotechniker
  • VDIF : VLBI Data Interchange Format
  • VESDA : Very Early Smoke Detection Apparatus
  • VEX : VLBI EXperiment (scheduling file)
  • VIPER : Visibility and Image Parallel Execution Reduction
  • VISTA : Visualization and Insights for Scientific operations and Analytics
  • VLA : Very Large Array
  • VLBI : Very Long Baseline Interferometry
  • VME : VERSAbus Module European
  • VNA : Vector Network Analyzer
  • VO: Virtual Observatory
  • VOM : VLBI Observing Mode
  • VPB : Virtual Parallel Bus
  • VPN : Virtual Private Network
  • VRF : Virtual Routing and Forwarding
  • VSI-S: VLBI Standard Interface for Software
  • VTX : Vertex (antenna pads at OSF)

    Acronyms starting with a W

  • WARP : Weblog Automated Review Project
  • WBS : Work Breakdown Structure
  • WCA : Warm Cartridge Assembly
  • WCRT : Worst Case Repair/Response Time
  • WDM : Wavelength Division Multiplexing
  • WIB : Wideband Input Buffer (ATAC)
  • WIR : Workmanship Inspection Report
  • WMA : Warm Multiplier Assembly
  • WRC : World Radiocommunication Conference
  • WSU : Wideband Sensitivity Upgrade
  • WVR : Water Vapor Radiometer

    Acronyms starting with a X

  • XCVR : Transceiver
  • XF: Correlation / Fourier Transform (correlator architecture type)
  • XML : eXtensible Markup Language
  • XRADIO : Xarray Radio Astronomy Data Input/Output
  • XRD : X-Ray Diffraction
  • XX: correlation product of the X linearly polarized feeds

    Acronyms starting with a Y

  • YIG: Yttrium -Iron Garnet Oscillator
  • YTO : YIG Tuned Oscillator
  • YY: correlation product of the Y linearly polarized feeds

    Acronyms starting with a Z

  • ZF: Zoom Factor
  • ZR: Extended Reach (optical fiber transmission specification, <80km, 1550nm)
  • ZW: Zoom Window