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A

ADM      : Add Drop Multiplexer

AFC      : Automatic Fare Collection(역무자동화설비)

ALS      : Automatic Laser Shut-down

ATC      : Automatic Train Control(자동열차제어장치)

ATM      : Asynchronous Transfer Mode

AU       : Administrative Unit

AUG      : Administrative Unit Group

AU-n     : Administrative Unit Level-n (n=3,4)

AU-4C    : Administrative Unit Level-4 Container

AWG      : Arrayed Waveguide Grating

B

BER      : Bit Error Rate

Bit      : Bitratio

BLK      : Blank

BLSR     : Bi-directional Line Switched Ring

bps      : bit per second

B3ZS     : Bipolar with 3 Zero Substitution

C

CAMS     : Computer Aided Maintenance System(컴퓨터 유지보수 장치)

CET      : Carrier Ethernet Technology

CCTV     : Closed-Circuit Television

CDF      : Combined Distribution Frame

CDMA     : Code Division Multiple Access

CIR      : Committed Information Rate

CIT      : Craft Interface Terminal

CMI      : Coded Mark Inversion

CMOS     : Complementary Metal Oxide Semiconductor

CMS      : Centralized Maintenance Supervision(중앙 유지보수장치)

CORBA    : Common Object Request Broker Architecture

CoS      : Class of Service

CPU      : Central Processing Unit

CRC      : Cyclic Redundancy Check

CRI      : CRItical

CTC      : Centralized Traffic Control

CV       : Code Violation

CWDM     : Coarse Wavelength Division Multiplexing

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D

DB       : Data Base

db       : decibel

DCC      : Data Communication Channel

DCE      : Data communication Equipment

DCF      : Dispersion Compensation Fiber

DCS      : Digital Cross-Connect System

DeMUX    : DeMUltipleXer

DEPOT    : Depot(차량기지)

DOTS     : Digital Office Timing Supply

DNS      : Domain Name System

DS-n     : Digital Signal level–n

DS-0     : Digital Signal level-0

DS-1E    : Digital Signal level-1E

DS-3     : Digital Signal Level-3

DS-4     : Digital Signal Level-4

DSF      : Dispersion Shifted Fiber

DTE      : Data Terminal Equipment

D.V.M    : Digital Voltage Multimeter

DWDM     : Dense Wavelength Division Multiplexing

E

E-BER    : Excessive-Bit Error Ratio

EDFA     : Erbium-Doped Fiber Amplifier

EMC      : Electro-Magnetic Compatibility(전자기파 적합성)

EMI      : Electro-Magnetic Interference(전자기파 간섭)

EMS      : Element Management System

EMS      : Electro-Magnetic Susceptibility(전자기파 내성)

EOS      : Ethernet over SDH

ERP      : Enterprise Resource Planning

ESCON    : Enterprise Systems Connection

ESP      : Ethernet SPlit

EXT      : EXTernal

F

FBG      : Fiber Bragg Grating

FC       : Fiber Channel

FC       : Fiber transmission system Connector

FCS      : Frame Check Sequence

FDF      : Fiber Distribution Frame

FE       : Fast Ethernet

FEC      : Forward Error Correction

FEPOL    : Front End Processing for Operating Level(역 정보전송장치)

FICON    : Fiber Connection

FITS     : Failure In Time

FMS      : Fault Management Subsystem

F/O      : Fiber Optical

F-OADM   : Fixed-Optical Add/Drop Multiplexing

FR       : Frame Relay

FSM      : Finite State Machine

FTP      : File Transfer Protocol

FTP      : Foil screened Twisted Pair

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G

GB       : Giga Byte

GFP      : Generic Framing Procedure

GPS      : Global Positioning System

GUI      : Graphic User Interface

H

HB       : Heat Baffle

HBD      : Hot Box Detector(차축온도검지장치)

HBS      : Hot Box Supervision(차축온도검지 중앙장치)

HDB3     : High Density Bipolar Of Order 3

HDLC     : High level Data Link Control

HEC      : Header Error Check

HTTP     : Hypertext Transport Protocol

I

IEC       : Interlocking Equipment Room(연동기계실)

IEEE      : Institute of Electrical Engineers

IETF      : Internet Engineering Task Force

InEC      : INtermediate Equipment Room

INMS      : Intergrated Network Management System

INT       : INTernal

IP        : Internet Protocol

IPG       : Inter Packet Gap

IPS       : Integrated Project Schedule(관리기준공정표)

IPv4      : Internet Protocol version 4

Ipv6      : Internet Protocol version 6

ITC       : Inspection and Test Checklist(검사 및 시험점검표)

ITP       : Inspection and Test Plan(검사 및 시험계획서)

ITU       : International Telecommunication Union

ITU-T     : International Telecommunication Union-Telecommunication

K

KRF       : Korea Reference Frequency

L

LAN       : Local Area Network

LAPS      : Link Access Procedure-SDH

LCAS      : Link Capacity Adjustment Scheme

LD        : Laser Diode

LLCF      : Link Loss Carrier Forward

LME       : Local maintenance Equipment(현장유지보수장비[ATC])

LTE       : Line Terminating Equipment

M

MAC       : Media Access Control

MD        : Meteorological Detectors[기상설비:강풍(WD)+강설(SD)+강우(RD)]

MDF       : Main Distribute Frame

MEF       : Metro Ethernet froum

MEMS      : Micro Electro-Mechanical System

MIB       : Management Information Base

MPEG      : Motion Picture Experts Group

MPLS-TP   : Multi Protocol Label Switching - Transport Profile

MPU       : Main Processing Unit

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MSOH      : Multiplexing Section OverHead

MSPP      : Multi-service Provisioning Platform

MSS       : Master Summary Schedule(기준공정표)

MS-SPRing : Multiplexer Section Shared Protection Ring

MTBF      : Mean Time Between Failures(평균 가용도)

MTR       : Mean Time to Restore(복구시간)

MTTR      : Mean Time To Repair(평균 수리시간)

MUX       : MUltipleXer

N

NE        : Network Element

NF        : Noise Filter

NMS       : Network Management System

NZ-DSF    : None Zero Dispersion Shift Fiber

O

OADM      : Optical Add/Drop Multiplexer

OC12      : Optical Carrier level-12

OC-48     : Optical Carrier level-48

OC-192    : Optical Carrier level-192

OCM       : Optical Channel Monitor

OFDM      : Optical FDM

O-MSP     : Optical-MultiplexSection Protocol

OS        : Operating System

OSA       : Optical Spectrum Analyzer

OSNR      : Optical Signal per Noise Ratio

O-SNCP    : Optical-SubNetwork Connection Protection

OT        : Outage Time(비가용시간)

OTDR      : Optical Time-Domain Reflectometer

OTN       : Optical Transport Network

P

PBB-TE    : Provider Backbone Bridge-Traffic Engineering

PDH       : Plesio-chronous Digital Hierarchy

PDP       : Power Distribution Panel

PFC       : Power Factor Correction

PLI       : Packet Length Indication

POH       : Path OverHead

POS       : Packet Over SDH

PMD       : Polarization Mode Dispersion

PP        : Parallel Post(병렬급전소)

PPP       : Point Point Protocol

PTE       : Path Terminating Equipment

Q

QoS       : Quality of Service

R

REG       : REGenerator

RPR       : Resilint Packet Ring

R-OADM    : Reconfigurable-Optical Add/Drop Multiplexing

RS        : Repeater Site

RS-232    : Recommended Standard 232

RS-485    : Recommended Standard 485

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RSOH      : Regenerator for Section Overhead

RSP       : Request For Proposal

RSTP      : Rapid Spanning Tree Protocol

RTU       : Remote Terminal Unit

S

SC/PC     : Subscriber Connector/Physical Contact

SCADA     : Supervisory Control And Data Acquisition System

SD        : Signal Degrade

SDH       : Synchronous Digital Hierarchy

SES       : Severely Errored Second

SIMS      : Smartnet Information management System

SLA       : Service Level Agreement

SMF       : Single Mode Fiber

SNCP-Ring : SubNetwork Connection Protection Ring

SNMP      : Simple Network Management Protocol

SOH       : Section Overhead

SONET     : Synchronous Optical NETwork

S/P       : Sectioning Post(급전구분소)

SPD       : Surge Protective Device

SS        : Sub-Station(변전소)

SSM       : Synchronization Status message

SSP       : Sub-Sectionong Post(보조 급전구분소)

STE       : Section Termination Equipment

STM-n     : Synchronous Transport Module level –n (n=1, 4, 16, 64, 256)

STM1      : Synchronous Transport Module level 1

STM4      : Synchronous Transport Module level 4

STM16     : Synchronous Transport Module level 16

STM64     : Synchronous Transport Module level 64

STP       : Spanning Tree Protocol

T

TCP-IP    : Transmission Control Protocol – Internet Protocol

TCS       : Train Control System

TDM       : Time Division Multiplexing

TIA       : Telecommunications Industry Association

TIDS      : Train Information Display System(여객자동안내설비)

TL/1      : Transaction Language / One

TLDS      : Track Circuit Function Supervision Device(궤도회로 기능감시장치)

TM        : Terminal

TMF       : Tele Management Forum

TNMS      : Total Network Management System(통합관리시스템)

TRS       : Trunked Radio System

TU        : Tributary Unit

TUG       : Tributary Unit Group

U

UDP       : User Datagram Protocol

UPS       : Uninterruptible Power Supply

UPSR      : Unidirectional Path Switched Ring

V

VBR       : Variable Bit Rate

VCAT      : Virtual Concatenation

VC        : Virtual Container

VC-n      : Virtual Container n

VC-12     : Virtual Container

VC-3      : Virtual Container level-3

VC-4      : Virtual Container level-4

VDF       : Voice Distribution Frame

VLAN      : Virtual Local Area Network

VOA       : Variable Optical Attenuator

VPN       : Virtual Private Network

W

WAN       : Wide Area Network

WCE       : Wayside Computerized Equipment(선로변 컴퓨터장치)

WDM       : Wavelength Division Multiplexing

WSS       : Wavelength Selective Switch

WTB       : Wayside Telecommunication Box(연선전화기)