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