A:Actuator

A:Amplifier

A:Attendance

A:Attenuation

AA:Antenna amplifier open line amplifier

AA:Architectural Acoustics architectural acoustics

AC:Analogue Controller analog controller

ACD:Automatic Call Distribution automatic Distribute traffic

ACS: Access Control System

AD: Addressable Detector

ADM: Add/Drop Multiplexer

ADPCM: Adaptive Differential ulse Code Modulation Adaptive Differential Pulse Code Modulation

AF: Acoustic Feedback

AFR: Amplitude /Frequency Response < /p>

AGC:Automati Gain Control

AHU:Air Handling Unit air handling unit

A-I:Auto-iris

AIS: Alarm Indication Signal Alarm indication signal

AITS: Acknowledged Information Transfer Service confirmation operation

ALC: Automati Level Control Automatic balance control

ALS: Alarm Seconds alarm Seconds

ALU: Analogue Lines Unit Analogue Lines Unit

AM: Administration Module management module

AN: Access Network access network

ANSI: American National Standards Institute American National Standards Institute

APS: Automatic Protectiontching automatic protection switching

ASC: Automati Slope Control automatic slope control

ATH: Analogue Trunk Unit simulated trunk unit

ATM: Asynchrous Transfer Mode asynchronous transfer mode

AU- PPJE: AU Pointer Positive Justification management unit positive pointer adjustment

AU: Administration Unit management unit

AU-AIS:Administrative Unit Alarm Indication SignalAU alarm indication signal

AUG:Administration Unit Group management unit group

AU-LOP:Loss of Administrative Unit Pointer AU pointer is lost

AU-NPJE:AU Pointer Negative Justification management unit negative pointer adjustment

AUP:Administration U

nit Pointer management unit pointer

AVCD: Auchio &Video Control Device

AWG: American Wire Gauge American cable specification

BA: Bridge Amplifier bridge amplifier TOP

BAC:Building Automation & Control netBuilding Automation and Control Network

BAM:Background Administration ModuleBackground Management Module

BBER:Background Block Error Ratio background Block error ratio

BCC:B-channel Connect ControlB channel connection control

BD:Building Distributor

BEF:Buiding Entrance Facilities Building entrance facilities

p>

BFOC: Bayonet Fiber Optic Connector large port fiber optic connector

BGN: Background Noise background noise

BGS: Background Sound background sound

BIP -N:Bit Interleaved Parity N code Bit Interleaved Parity N-bit code

B-ISDN:Brand band ISDN Broadband Integrated Services Digital Network

B-ISDN:Broad band - Integrated Services Digital Network Broadband Integrated Services Digital Network

BMC: Burst Mode Controller Burst Mode Controller

BMS: Building Management System Intelligent Building Management System

BRI :Basic Rate ISDN Basic rate integrated services digital network

BS: Base Station base station

BSC: Base Station Controller base station controller

BUL: Back up lighting Backup lighting

C/S: Client/Server client/server TOP

C:Combines mixer

C:Container container

CA:Call Accounting automatic billing system

CATV:Cable Television

CC:Call Control call control

CC:Coax cable coaxial cable

CCD: Charge coupled devices

CCF: Cluster Contril Function

CD: Campus Distributor

CD: Combination detector, heat and smoke combined detector

CDCA: Continuous Dynamic Channel Assign Continuous Dynamic Channel Assign

CDDI: Copper Distributed Data Contract cable distributed data Interface

CDES: Carbon dioxide extinguisbing system carbon dioxide system

CDMA: Code Division Multiplex Access code division multiple access

CF: Core Function core function

CFM: Compounded Frequency Modulation Frequent compensating modulation

CIS: Call Information System Call Information System

CISPR: International Special Committee on Radio Interference

CLNP: Connectionless Network Protocol Connectionless mode network layer protocol

CLP: Cell Loss Priority cell loss priority

CM: Communication Module communication module

CM: Configuration Management configuration management

CM: Cross-connect Matrix cross-connect matrix

CMI: Coded Mark Inversion code inversion

CMISE: Common Management Information Service common management information protocol Service unit

CPE: Convergence protocol entity Convergence protocol entity

CR/E: card reader /Encoder (Ticket reader) card reader/encoder

CRC: Cyclic Redundancy Check Cyclic Redundancy Check

CRT: Cathode Ray Tabe display, monitor, cathode ray tube

CS: Convergence service Convergence service

CS:Cableron Spectrum old storage block technology

CS:Ceiling Screen smoke barrier

CS:Convergence Sublayer

CSC:Combined Speaker Cabinet combination speaker

CSCW:Computer supported collaborative work Computer supported collaborative work

CSES:Continuius Severely Errored Second Continuous serious error seconds

CSF:Cell Site Function Single base station function control

CTB:Composite Triple Beat compound triple beat

CTD: Cable Thermal Detector cable linear temperature detector

CTNR :carrier to noise ratio Carrier ratio

CW:Control Word

D:Directional TOP

D:Distortion

< p> D: Distributive

DA: Distribution Amplifier

DBA: Database Administrator

DBCSN: Database Control System Nucleus database control system core

DBOS: Database Organizing System database organization system

DBSS: Database Security System database security system

DC:Door Contacts door sensor

DCC: Digital Communication Channel digital communication channel

DCN: Data Communication Network data communication network

DCP-I: Distributed Control Panel -Intelligent intelligence Type distributed controller

DCS: Distributed Control System

DDN: Digital Data Network digital data network

DDS: Direct Dignital Controller direct digital control

DDW: Data Describing Word

DECT: Digital Enhanced Cordless Telecommunication

DFB: Distributed Feedback

DID: Direct Inward Dialing direct relay mode, incoming calls are directly dialed to extension users

DLC: Data Link Control Layer data link layer

DLI: DECT Line Interface

p>

DODI:Direct Outward Dialing One dial tone

DPH:DECT Phone

DRC: Directional Response Cahracteristics directional response

DS:Direct Sound Direct Sound

DSP: Digital signal Processing Digital Signal Processing

DSS: Deiision Support System Decision Support System

DTMF: Dual Tone Multi-Frequency Dual Tone Multi Frequency

DTS:Dual-Technology Sensor Dual-Detection Sensor

DWDM:Dense Wave-length Division Multiplexing Dense Wave Division Multiplexing

DXC:Digital Cross-Connect Digital cross-connect

E:Emergency lighting lighting equipment TOP

E:Equalizer equalizer

E:Expander expander

EA- DFB:Electricity Absorb-Distributed Feedback

ECC:Embedded Control Channel embedded or control channel

EDFA:Erbium-Doped Fiber Amplifier

< p> EDI: Electronic Data Interexchange

EIC: Electrical Impedan

ce Characteristics Electrical impedance characteristics

EMC: Electro Magnetic Compatibiloty Electromagnetic compatibility

EMI: Electro Magnetic Interference Electromagnetic interference

EMS: Electromagnetic Sensitibility Electromagnetic susceptibility

p>

EN:Equivalent Noise equivalent noise

EP:Emergency Power emergency power supply

ES:Emergency Sooket emergency socket

ES:Evacuation Sigvial evacuation Lighting

ESA:Error SecondA Error SecondA Error Second Type A

ESB:ErrorSecondB Error Second Type B

ESD:Electrostatic DischargeElectrostatic Discharge

< p> ESR: Errored Second Ratio

ETDM: Electrical Time Division Multiplexing

ETSI: European Telecommunication Standards Institute European Telecommunications Standards Institute

< p> F:Filter filter TOP

FAB:Fire Alarm Bell fire alarm bell

FACU:Fire Alarm Control Unit fire automatic alarm control device

FC: Failure Count

FC: Frequency Converter

FCC: Fire Alarm System

FCS: Field Control System

FCU: Favn Coil Unit fan coil unit

FD: Fire Door fire door

FD: Flame Detector flame detector

FD: Floor Distributor

FD: Frequency Dirsder

FDD: Frequency Division Dual

FDDI: Fiberdistributed Data Interface optical fiber cable distributed data interface.

FDDIF: Fiber Distributed Data Inferface optical cable distribution data interface

FDMA: Frequency Division Multiple Access frequency division multiple access

FE: Fire Extirguisher fire elevator

FEBE:Far End Block Error

FEXT:Far End Crosstalk

FFES:Foam Fire Extionuishing System

FH: Fire hydrant

FI: Fee Indicator

FL: Focal Length

FL: Fuzzy Logic

FM: Failure Management

FPA: Fire Public Address Fire Accident Broadcast

FPD: Fire Public Derice Fire Protection Facilities

FR: Frequency Response Frequency Ring

FRD: Fire Resis tamt Damper fire valve

FRS: fire resistant shutter fire shutter

FSK: Frequency Shift Keying

FSU:Fixed Subscriber Unit

FTHD:Fixed temperatute Heat Detector

FTP:Foil Tnisted Pair

p>

FTTB: Fiber To The Building Fiber to the building

FTTC: Fiber To The Curb Fiber to the roadside

FTTH: Fiber To The Home Fiber to the home

FW:fire Wall Firewall

FWHM: Full Width Half Maximum The half-height width of the pulse

PACR: Attonation to Crosstalk Ratio

GAP:Gaussian (filtered)Frequency Shift Keying TOP

GBS:Glass Break Sensors

GC:Generic Cabling

< p> GIB: Generic Information Block General Information Module

GNE: Gateway Network Element gateway

GSM: Global System for Mobile communications Global Mobile Communications System

H: Hybrid TOP

HCBS:High C Bus Servers Unit High-speed C Bus Servers Unit

HCS:Higher order Connection SupervisionHigh-order connection monitoring

HD: Heat Detecter Heat Detector

<

p> HDB3: High Density Bipolar of order 3code High Density Bipolar Code

HDLC: High Data Link Control Advanced Data Link Control

HDLC: High Digital Link Control Advanced Data Link Channel Control

HDSL: High-bit -rate Digital Subscriber Link High-bit Digital Subscriber Link

HDTV: High Definition Television High Definition Television

HEC: Header Ervor Control: Header error control domain

HEMS: High-level Entity Management system Advanced Entity Management System

HFC: Hybrid fiber coax fiber-coaxial cable hybrid system

HGRP: Home Optical Network Huawei's proprietary protocol

HIFI: High Fidelity high fidelity

HIPPI: High Performance Parrallel Interface high performance parallel interface

HMP:Host monitoring protocol Host monitoring protocol

HOA:High Order Assembler High Order Assembler

HOAPID:High Order Path Access Point IdentifierHigh Order Path Access Point Identifier< /p>

HOI: High Order Interface high-order interface

HONET: Home Optical Network Huawei integrated service access network trademark

HO-TCM: High Order Tandem Connection Monitor high Order channel serial connection monitoring

HOVC: High Order Virtual Container virtual container

HPA: High order path Adaptation high order adaptation

HPC: High order path Connection high order Channel connection

HPOM:High -order Path Overhead MonitorHigh-order path overhead monitor

HPP:High-order path ProtectionHigh-order path protection

HP- RDI:Higher order path -Remote Defect IndicationHigh order path receive defect indication

HP-REI:Higher order Path-Remote ErrorIndicationHigh order path remote error indication

HPT:High order path TerminationHigh-order path terminal

HRDS:Hypothetical Reference Digital SectionHypothetical reference digital field

HSUT:High-order path Supervision Unequipped TerminationHigh-order path supervision Unequipped Termination

HVAC:Heating Ventilation Air ConditioningHVAC

HWS:Hot Water SupplyHot water supply system

I:Interference crosstalk

TOP

IA: Intruder Alarm

ICMP: Internet Control Message Protocol

IDC: Insucation Displacement Connection

p>

IDS: Industrial Distribution System Industrial Wiring System

IFC: Intelligent Fire Controller Lighting Intelligent Controller

ILD: Inject Light Diode Injection Laser Diode

< p> IM:Impedance Matching impedance matching

IMA:Interactive Multimedia Association interactive multimedia protocol

IM-DM:Intensity Modulation-Direction Modulationdirect intensity modulation

IN:Information Network Information Network

IO: Information Outlet Information Socket

IOS: Intelligent Out Station Intelligent Peripheral Station

IPEI: International Portable International Mobile Equipment Identification Number

IPTU:Indoor Pan & Tilt Unit Indoor Pan & Tilt Unit

IPUI:International Portable User Identity

ISD:Ionization Smoke Detector Smoke Detector

IT: Information Technology Information Technology

ITU: International Telecommunications Union International Telecommunications Union

ITU-T: formerly known as CCITT, is the International Telecommunications Union A committee

ITV: Interactive Tevevision Interactive TV

JIT-Discussion conference system Impromptu speech system

L:Lens camera lens TOP

LAN: Local Area Network LAN

LAPB: Link Access Procedure-Balanced link access procedure----balanced

LAPD: Link Access Procedure D-channel D channel link Access Protocol

LCD: Liquid Crystal Display LCD

LCL: Longituchinal Conrorsion Loss Longitudinal Mode Conversion Loss

LCN: Local Communication Network

p>

LCS: Lower order Connection Supervision low-level connection monitoring

LD: Laser Diode excitation diode

LE: Local Exchange local exchange network

LED :Light Emittirng Diode

LIU：Lightguid

e Interconnection Unit Optical fiber interconnection device

LLC: Logic Link Control Layer Logic link control layer

LLME: Low Layer Management Entity low-layer management entity

LM: Lerel Modulation level adjustment

LNA: Low Noise Amplifier low noise amplifier

LOF: Loss Of Frame frame loss

LOI: Low Order Interface low-level interface< /p>

LOP:Loss Of Pointer pointer is lost

LOS:Loss Of Signal signal is lost

LO-TCM:Low Order Tandem Connection Monitor low-order channel tandem connection monitor

LOVC: Low Order Virtual Container low-order virtual container

LPA: Lower order qath Adaptation low-order channel adaptation

LPC: Lower order Path Connection low-order Channel Connection

LPOM: Low-order Path Overhead Monitor Low-order Path Overhead Monitor

LPP: Low-order Path Protection Low-order Path Protection

LPT: Lower order Path Termination low order path terminal

LSBCM: Laser Base Current Monitor laser bias current monitoring

LSUT: Low -order path Supervision Unequipped low order path monitoring unloaded terminal

LTC: Londline Trunk Coutroller wired line distributor

LU: Line Unit line unit

MAC: Medium Access Control Layer Media Access Control Layer TOP

MBMC:Multiple Burst Mode ControllerMultiple Burst Mode Controller

MCF:Message Communication Function

MD:Mediation Device

MFPB:Multi -Frequency Press ButtonMulti-frequency button

MIB: Management Information Base Management Information Base

MIC: Mediu Interface Connector media interface connector

MIO: Multiuser Information Outlet Multi-user information socket

MLM: Multi-Longitudinal Mode

MM: Mobile Management Mobile Management

MMDS: Maltichanned Microware Distribution System multi-channel microwave distribution System

MMO:Multionedia Outlet Multimedia Socket

MN-NES:MN-Network Element System Network Element Management System

MN-RMS:MN-Region Manag

ement System network management system

MO:Managed Object management target

MSA:Multiplex Section Adaptation multiplex section adaptation

MS-AIS:Mutiplex Section-Alarm Indication Signal Multiplex Section Alarm Indication Signal

MSOH: Multiplex Section Overhead Multiplex Section Overhead

MSP: Multiplex Section Protection Multiplex Section Protection

MS-RDI :Multiplex Section-Remote Defect IndicationMultiplex Section Remote Defect Indication

MST:Multiplex Section TerminationMultiplex Section Termination

MSU:Multi-Subscriber UnitMulti-Subscriber Unit

MTIE:Maximum Time Interval ErrorMaximum time interval error

MUX:Multiplexer flexible multiplexer

NDF:New DataFlag new data identification

NDFA: Niobium-Doped Fiber Amplifier niobium-doped fiber amplifier

NE: Network Element network element

NEXT: Near End Crosstalk

NMS: Network Management System network Management System

NNE:Non-SDH Network Element Non-SDH Network Element

NNI:Network Node InterfaceNetwork Node Interface

NPI:Null Pointer Indication invalid pointer indication

NWK: Network Layer Network Layer

NZ-DSF: Non Zero-Dispersion Shift Fiber Non-Scattered Displacement Fiber

OAM&P: Operation Administration, Maintenance and Provisioning , Management, Maintenance and Preset

OAM: Operation, Administration and Maintenance

OBFD: Optical Beam Flame Detector Linear Light Speed ??Flame Detector

< p> OC-N: Optical carrier level-N optical carrier level N

OCR: Optical Character Recogmition optical character recognition

OEIC: Optoelectronic Integrated Circuit optoelectronic integrated circuit

< p> OFA:Optical Fiber Amplifier

OHP:Overhead Processing

OLT:Optical Line Terminal

ON:Orerall Noise

ONU: Optical Network Unit Optical Network Unit

OOF: Out Of Frame Frame out of sync

OOP: Object Oriental Programming object-oriented programming

OS:Operating System operating system

OSC:Oscillator oscillator

OSI: Open Systems Interconnection open system interconnection

OTDK: Optical Time Doman Reflectometer Optical Time Domain Reflectometer

OTDM: Optical Time Division Multiplexing Optical Time Division Multiplexing

PA:Power Amphfier Power Amplifier TOP

PA:Power Amplifier power amplifier

PABX:Private Auntomatic Branch Exchange Program-controlled digital automatic exchange

Paging: Wireless calling system

PAL:Pinhole Alc Lons Pinhole type automatic brightness control Lens

PARK:Portable Access Rights Key Mobile user access rights identification code

PAS:Public Address System Public broadcasting sound system

PBX:Private Brancn exchange program-controlled user exchange

PC: Pan unit&control PTZ and PTZ controller

PC: Proximinty Card proximity card

PCM: Pulse Code Modulation Pulse coding Modulation

PCS: Personal Communication Service

PDFA: Praseodymium-Doped Fiber Amplifier

PDH: Plesiochronous digital Hierarchy quasi-synchronous digital series

PDN: Public data network Public data network

PDS: Premises Distribution Systemn building structured integrated wiring system

PF: Pressurization Fan

p>

PG: Pressure Gradient

PID: Passire Infrared Detector

PJE: Pointer Justification Event

PLC :Programmerable Logic Controller Programmable Controller

PM:Power Matching Power Matching

PMS:Prooerty Management system Resource Management System

PO:Pressure Operated< /p>

POH:Path Overhead channel overhead

PPI:PDH Physical InterfacePDH physical interface

Preamplification: preamplification

PRI:Primany Rate Interface Basic group rate interface

PRM: Patter Recogniton Method

PSC: Protection switching count

PSD: Photoelectric Smoke Detector Photoelectric Smoke Detector

PSD: Protectiontching Duration protection switching duration

PSK: Phase Shift Keying

PSNT: Ponver Sum Next Comprehensive near-end crosstalk

PSPDN:Packettched Public Data Network public packet switching network

PSTN:Publictch Telephone Network public switched telephone network

PU:Pick Up pickup

PVC:Polyvingl chloride polyvinyl chloride

PVCS:Public video conferring system public conference television system

PWS:Power system power system

ITU-T: International Telecommunication Union-Telecommunication Sector International Telecommunication Union-Telecommunication Standards Department R: Receiver Terminal Decoder TOP

R: Reverberator

RC: Radio Communication mobile communication

RC: Room's Coefficient room coefficient

RCU: Remote Control Units terminal controller

RDI: Remote Defect Indication remote failure indication

REG: Regenerator

Resolution: Clarity

RF: Radio Frequency

RHE: Romote Head End

RMC: Repeater Management Controller Antenna Channel Controller

RMS: Root Mean Square Root Mean Square Value

RMU: Redundancy Memory Unit Redundancy Memory

RORTD:Rate Of Rise Thermal Detector

RR:Reverberation Radius

RS:Reflected sound reflection field

RSOH: Regenerator Section Ouerhead Regeneration section overhead

RSSI: Radio Signal Strength Indicator

RST: Regenerator Section Termination Regeneration section terminal

RSU: Remote Subscriber Unit Remote subscriber unit

RT:Real Time

RT:Reverberation Time

RWS:Remote Workstation Remote Workstation

S:Sprinkler Distributor TOP

S:Stereo two-channel

S:Strike electronic door lock

SAA:Sound Absorp

tion Ability Sound absorption ability

SAR: Segmetation and reassembly sublayer

SATV: Sate Llite satellite TV

SBS: Synchronous Backbone System Synchronous information backbone System

SBSMN: SBS SBS Management Network series transmission equipment network management system

SC: Smart Card smart card

SC: Subscriber Connector (Optial Fiber Connector) user connector (Fiber optic connector)

SC: Supervisong Center Central Station Monitoring Center Management Center

SCADA: Monitoring and data acquisition software

SCB: System Control Board system control Board

SCC: System Control&Communication system communication control

SC-D: Saplex sc commector dual ISC connector

SCD: Sound Console Desk dispatch console

SCPC: Single Chnanel Per Carrier satellite backhaul line

SCS: Stractured Cabling System structured cabling system

SD: Signal Degraded signal degradation

SD :Smoke damper smoke exhaust valve

SD:Smoke Detector smoke detector

SD:System Distortion system distortion

SDCA:Synchronization DCA synchronous data communication adapter< /p>

SDMA:Spaee Division Multiplex Access

SDXC:Synchronous Digital Cross Connect

SE:Sound Energy

< p> SEC:SDH Equipment Clock SDH equipment clock

SED:Sound Energy Density

SEEF:Smoke Extractor Exhaust Fan

SEMF: Synchronous Equipment Management Function Synchronous Equipment Management Function

SES: Severely Errored Second Seriously Errored Second

SESR: Severely Errlred Second Ratio Severely Errored Second Ratio

SETPI :Synchronous Equipment Timing Physical Interface Synchronous Equipment Timing Physical Interface

SETS: Synchronous Equipment Timing Source Synchronous Equipment Timing Source

SF: Spur Feeder branch line

SF: Subscribers Feeder Subscriber Line

SFN:Sound Field Nonunifornity

SFP:Sound Field Processor Sound Field Processor

SI:Sound Instal

lation audio equipment

SI: Sound Insulation sound insulation

SICS: Simultaneous Interpretation Conference system simultaneous interpretation system

SIPP: Service Interface and protocol processing unit business interface and Protocol processing unit

SLC:Sate llite Communication Satellite Communication

SLI:Synchronous Line Optical Interface Synchronous Line Optical Interface Board

SLIC:Subscriber Line Interface Controller user line Interface controller

SLM: Signal Label Mismatch Signal label mismatch

SM: Synchronous Multiplexer synchronization multiplexer

SMF: System management function system management function < /p>

SMS:SDH Management Sub -Network SDH Management Subnet

SNA:System Network