岑紛嚥彿儷
廨匍簡祉
 
窮佚抹待囂
窟下扮寂2011-7-17 15:30:00||  泣似3976肝||  猟嫗蛍窃祭匍簡祉||  窟下繁鍬咎社(Fanyijia.com)



  A
  
  
  aoc ADSL overhead control channel
  AA Administrative Authority
  AAL ATM Adaptive Layer
  AAR Automatic Alternate Routing
  ABR Available Bandwidth Rate
  ABR Available Bit Rate
  ACD Automatic Call Distribution
  ACF Access Coordination Function
  ACK Acknowledgment
  ACM Adress Complete Message
  ACO Automatic Cut Off
  ACSE Association Control Service Element
  ACU Alarm Control Unit
  ADC Analog to Digital Converter
  ADM Add/Drop Multiplexer
  ADM 3X DS3 Add-Drop Multiplex
  ADPCM Adaptive Differential Pulse Code Modulation
  ADSI Analog Display Services Interface
  ADSL Asymmetric Digital Subscriber Line
  ADSS All Dielectric Self-Supporting
  ADTS Automated Digital Terminal Systems
  AERM Alignment Error Rate Monitor
  AFI Authority and Format Identifier
  AFSK Audio Frequency Shift Keying
  AFPS Automatic Facility Protection Switching
  Ai Action indicator
  AIN Advanced Intelligent Network
  AIS Alarm Indication Signal
  AIS-L Alarm Indication Signal - Line
  AIS-P Alarm Indication Signal - Path
  AIS-V Alarm Indication Signal - Virtual (Tributary)
  AIU Analog Interface Unit
  ALIT Automatic Line Insulation Test
  ALPS Automatic Loop Protection Switching
  AMA Automatic Message Accounting
  AMI Alternate Mark Inversion
  AMPS Advanced Mobile Phone Service
  ANC Access network Controller
  ANI Automatic Number Identification
  ANSI American National Standards Institute
  AON All Optical Network
  AP Access Point
  AP Action Point
  APDU Application Protocol Data Unit
  APR Alarm Processing Remote
  APS Automatic Protection Switching
  ARD Automatic Ring Down
  ARP Address Resolution Protocol
  AS56 Accunet Switched 56
  ASB Application Specific Bits
  ASCII American Standard Code for Information Interchange
  ASN.1 Abstract Syntax Notation One
  ASP Application Service Provider
  ASP Assignment Source Point
  AT Access Tandems
  ATM Asynchronous Transfer Mode
  ATM-LI ATM Link Identifier
  ATM-PCI ATM Protocol Control Information
  ATM-SDU ATM Service Data Unit
  ATMM ATM Layer Management
  ATU-C ADSL Transceiver Unit - Central office end
  ATU-R ADSL Transceiver Unit - Remote terminal end 
  
  
  B
  
  
  B3ZS Bipolar 3 Zero Substitution
  B6ZS Bipolar 6 Zero Substitution
  B8ZS Bipolar 8 Zero Substitution
  B8ZS Bipolar 8 Zero Suppression
  B-CPE Broadband Customer Premises Equipment
  B-ICI Broadband Inter-Carrier Interface
  BAF Bellcore AMA Format
  Bc Committed Burst Size
  BCD Binary Coded Decimal
  BCM Bit Compression Multiplexer
  BDFB Battery Distribution Fuse Board
  BDCBB Battery Distribution Circuit Breaker Board
  BE Block Error
  BECN Backward Explicit Congestion Notification
  BER Basic Encoding Rules
  BER Bit Error Ratio
  BERT Bit Error Rate Tester
  BFCV Binary Facility Coding Value
  BGP Border Gateway Protocol
  BIB Backward Indicator Bit
  BIBR Backward Indicator Bit Received
  BIBT Backward Indicator Bit to be Transmitted
  BIBX Backward Indicator Bit eXpected
  BIP Bit Interleaved Parity
  BISDN Broadband Integrated Services Digital Network
  BISUP Broadband ISUP (ISDN User Part)
  BLER Block Error Rate
  BOC Bell Operating Company
  BOM Beginning of Message
  BORSCHT Battery feed, Overvoltage protection, Ringing,
   Signaling, Coding, Hybrid, and Testing
  BPOP Building Point of Presence
  bps Bits Per Second
  BPV Bipolar Violation
  BRA Basic Rate Access
  BRI Basic Rate Interface (ISDN)
  BRITE Basic Rate Interface Transmission Extension
  BSC Base Station Controller
  BSC Bisynchronous Communications (protocol)
  BSN Backward Sequence Number
  BSNR Backward Sequence Number Received
  BSNT Backward Sequence Number to be Transmitted
  BSP Bell System Practice
  BSRF Basic System Reference Frequency
  BSS Base Station Subsystem
  BSS Basic Service Set
  BSS Broadband Switching System
  BTS Base Station Transceiver
  
  
  
  C
  
  
  C/R Command/Response
  C/R Control/Response Indication Bit
  CAC Connection Admission Control
  CAL Customer Access Line
  CAP Carrierless Amplitude Phase (modulated)
  CAP Competitive Access Provider
  CAS Channel Associated Signaling
  CATV Cable television
  CBCU Centralized Broadband Control Unit
  CBDS Connectionless Broadband Data Services
  CBR Constant Bit Rate
  CBQ Class-Based Queuing
  Cc Committed Burst Size
  CCC Clear Channel Capability
  CCE Consistency Check End
  CCS Hundred Call Seconds
  CCIS Common Channel Inter-office Signaling
  CCITT Comite Consultatif Internationale Telegraphique
   et Telephonique
  CCITT International Telegraph and Telephone Consultative Committee
  CCR Consistency Check request
  CCR Customer Controlled Reconfiguration
  CCS Common Channel Signaling
  CCS Hundred Call Seconds
  CCSA Common Control Switching Arrangement
  CCU Common Control Unit
  CDMA Code Division Multiple Access
  CDO Community Dial Office
  CDPD Cellular Digital Packet Data
  CEI Connection Endpoint Identifier
  CEPT Committee of European Postal & Telephone (authorities)
  CES Circuit Emulation Service
  CES Connection Endpoint Suffix
  CEV Controlled Environment Vault
  CF Coin First
  CFA Carrier Failure Alarm
  CGA Carrier Group Alarm
  CGW Customer Gateway
  CH Cell Header
  CHTML Compact Hyper Text Markup Language
  CI Customer Installation
  CID Craft Interface Device
  CIR Committed Information Rate
  CIU Communications Interface Unit
  CLEC Competitive Local Exchange Carrier
  CLLM Consolidated Link Layer Management
  CLNP Connectionless-mode Network Protocol
  CLNS Connectionless Network Services
  CLP Cell Loss Priority (CLP Bit)
  CLS Connectionless Service
  CMIP Common Management Information Protocol
  CMIS Common Management Information Service
  CMISE Common Management Information Service Element
  CNM Customer Network Management
  CO Central Office
  COC Central Office Connection
  CODEC COder-DECoder
  COFA Change of Frame Alignment
  COM Continuation of Message
  COMPANDER COMpressor/exPANDER
  COPS Common Open Policy Service
  CORBA Common Object Request Broker Architecture
  COT Central Office Terminal
  CP Cell Payload
  CP Customer Premises
  CPCS Common Part Convergence Sublayer
  CPE Customer Premises Equipment
  CPI Computer-PBX Interface
  CPNI Customer Proprietary Network Information
  CPP Calling Party Pays
  CPS Customer Premises System
  CPU Central Processor Unit
  CR Call Reference
  CRC Cyclic Redundancy Checkword
  CRM Circuit Reservation Message
  CRS Cell relay Service
  CRV Call Reference Value
  CS Convergence Sublayer
  CSA Canadian Standards Association
  CSA Carrier Service Area
  CSAP Core Service Access Point
  CSC Common Signaling Channel
  CSDU Core Service Data Unit
  CSH Convergence Sublayer Header
  CSMA/CD Carrier Sense Multiple Access/Collision Detect
  CU Channel Unit
  CS Convergence Sublayer
  CSA Carrier Serving Areas
  CSR Consistency Check Request
  CST Convergence Sublayer Trailer
  CSU Channel Service Unit
  CS-PDU Convergence Sub-layer PDU
  CT Channel Termination
  CT Computer Telephony
  CTU Channel Test Unit
  CU Channel Unit
  CUG Closed Users Group
  CV Coding Violation
  CVSD Continuously Variable Slope Delta Modulation
  CPE Customer Premise Equipment
  CPI Computer-PBX Interface
  CTS Clear to Send
  CV Coding Violation
  CUG Closed Users Group
  CVSD Continuously Variable Slope, Delta Modulation
  CWC Center Weight Control
  
  
  
  D
  
  
  DA Distribution Area
  DACS Digital Access and Cross Connect
  DAVIC Digital Audio Video Council
  DBS Direct Broadcast Satellite
  dB deciBell
  dBm dB relative to one milliwatt
  DBN Dial-Back Number
  dBrn dB relative to noise
  dBrnc dB relative to noise (C-Notch or C-Message)
  DCB Digital Channel Bank
  DCC Data Communications Channel
  DCC Data Country Code
  DCCX Direct Circuit Control Exchange
  DCE Data Circuit-terminating Equipment
  DCE Data Communications Equipment
  DCF Distributed Coordination Function
  DCN Data Communications Network
  DCS Digital Cross-connect
  DCSs Digital Cross-Connect System
  DDD Direct Distance Dialing
  DDS Dataphone Digital Service (registered trademark of AT&T C0.)
  DDS Digital Data Service
  DDSD Delay Dial Start Dial
  DE Discard Eligibility
  DF Distributing Frame
  DFL Distributed Feedback Laser
  DFRI Datacom Reference Frame Input
  DHCP Dynamic Host Configuration Protocol
  DID Directed Inward Dialing
  DL Data Link
  DLC Digital Loop Carrier
  DLCI Data Link Connection Identifier
  DLL Dial Long Line
  DLU Digtal Line Unit
  DM Disconnected Mode
  DMI Digital Multiplex Interface
  DMPB Digital Multipoint Bridging
  DMS Digital Multiplex System
  DMT Discrete Multitone
  DNIC Data Network Identification Code
  DNIC Data Network Interface (2B+D ISDN)
  DNIS Dialed Number Identification Service
  DNS Domain Name System
  DOCSIS Data Over Cable Service Interface Specification
  DoV Data Over Voice
  DP Dial Pulse
  DPA Distributed Power Architecture
  DPBX Digital Private Brance Exchange
  DPC Destination Point Code
  DPCM Differential Pulse Code Modulation
  DPDU Data (link) Protocol Data Unit
  DPL Digital Power Line
  DPO Dial Pulse Originate
  DPT Dial Pulse Terminate
  DPT Dynamic Packet Transport
  DS0 Digital Signal Zero - 64 Kb/s data/voice chan
  DS1 Digital Signal One (DS0 x 24 mux = 24 DS0)
  DS2 Digital Signal 2 (DS1 x 4 mux = 96 DS0)
  DS3 Digital Signal 3(DS2 x 7 mux = 672 DS0)
  DSI Digital Speech Interpolation
  DSL Digital Subscriber Line
  DSLAM Digital Subscriber Line Access Multiplexer
  DSODP Digital Service Office Dataport
  DSP Digital Signal Processor
  DSSS Direct Sequence Spread Spectrum
  DSU Digital Service Unit
  DSX Digital Signal Cross-connect
  DSSS Direct Sequence Spread Spectrum
  DTAU Digital Test Access Unit
  DTE Data Terminal Equipment
  DTF Dial Tone First
  DTF Digital Transmission Facility
  DTI Digital Trunk Interface
  DTMF Dual Tone Multiple Frequency
  DTR Data Terminal Ready
  DTS Digital Terminal Systems
  DTS Digital Transmission Systems
  DTU Data Terminal Unit
  DUP Data User Part
  DVI Digital Video Interleaved
  DWDM Dense Wavelength Division Multiplexing
  DX Duplex
  DXC Digital Cross Connect
  DXI Data Exchange Interface
  D/I Drop and Insert
  D3 Third generation channel bank
   (24 chans on T1)
  D4 Fourth generation channel bank
   (48 voice chans on 2 T1's or 1 T-1C)
  
  
  
  E
  
  
  EA Extended Address
  EAI Enterprise Application Integration
  EBCDIC Extended Binary Coded Decimal Information Code
  EC Echo Canceling
  EC-n Electrical Carrier (e.g., EC-1)
  ECSA Exchange Carriers Standards Association
  EDFA Erbium-Doped Fiber Amplifier
  EDI Electronic Data Interchange
  EDSX Electronic Digital Signal Cross-Connect
  EFCI Explicit Forward Congestion Indication
  EFD Event Forwarding Discriminator
  EFS Error Free Second
  EGP Exterior Gateway Protocol
  EIM Errored Interval Monitored
  ELEC Ethernet Local Exchange Carrier
  ELFEXT Equal Level Far End Crosstalk
  EM Element Manager
  EML Element Management Layer
  EMI Electromagnetic Interference
  EMS Element Management System
  EOC Embedded Operations Channel
  EOM End of Message
  EPSCS Enhanced Private Switch Controlled System
  ERL Echo Return Loss
  ERM Explicit Rate Marketing
  ES Errored Second
  ESF Extended Super Frame
  ESG Enhanced Service Gateway
  ESFDL Extended Super Frame Data-Link
  ESI End System Identifier
  ESS Electronic Switching System
  ET Exchange Termination
  ETN Electronic Tandem Network
  ETSI European Telecommunications Standards Institute
  EXZ Excess Zeros
  
  
  
  F
  
  
  FAS Frame Alignment Signal
  FAW Frame Alignment Word
  FB Framing Bit
  FBWA Fixed Broadband Wireless Access
  FCC Federal Communications Commission
  FCS Frame Check Sequence
  FDDI Fiber Distributed Data Interface
  FDI Feeder Distribution Interface
  FDL Facilities Data Link
  FDLC Fujitsu Digital Loop Carrier
  FDM Frequency Division Multiplexing
  FE Frame synchronization bit error Event
  FEAC Far End Alarm and Control
  FEBE Far End Block Error
  FEBE-f Far End Block Error Count - fast data
  FEBE-i Far End Block Error Count - interleaved data
  FEC Forward Error Correction
  FECC-f Forward Error Correction Count - fast data
  FECC-i Forward Error Correction Count - interleaved data
  FECN Forward Explicit Congestion Notification
  FELB Far End Loop Back
  FERF Far End Receive Failure
  FEXT Far-End Cross Talk
  FHSS Frequency Hopping Spread Spectrum
  FI Facility Identification
  FIB Forward Indicator Bit
  FIBR Forward Indicator Bit Received
  FIBT Forward Indicator Bit to be Transmitted
  FIBX Forward Indicator Bit eXpected
  FIC Frame Identification Code
  FIFO First In First Out
  FISU Fill-In Signal Unit
  FITL Fiber In The Loop
  FLL Fixed Loss Loop
  FOTS Fiber Optical Transmission System
  FPS Framing Pattern Sequence
  FR-SSCS Frame Relay Service Specific Convergence Sub-layer
  FRAD Frame Relay Access Device
  FRAD Frame Relay Assembler/Disassembler
  FRF-LMI Frame Relay Forum - Local Management Interface
  FRMR Frame Reject
  FR PVC Frame Relay Permanent Virtual Connection
  FRS Frame Relay Service
  FRSS Frame Relay Switching System
  FSK Frequency Shift Keying
  FSN Forward Sequence Number
  FTAM File Transfer, Access and Management
  FTP File Transfer Protocol
  FTSC Federal Telecommunications Standards Committee
  FTTC Fiber to the Curb
  FTTH Fiber to the House
  FTTL Fiber to the Loop
  FTTN Fiber to the Neighborhood
  FT1 Fractional T1
  FUNI Frame (relay) User Network Interface
  FXO Foreign Exchange Office
  FX Foreign Exchange
  FXO Foreign Exchange Office
  FXS Foreign Exchange Subscriber
  
  
  
  G
  
  
  GFC Generic Flow Control
  GFI General Format Identifier
  GGP Gateway to Gateway Protocol
  GGSN Gateway GPRS Support Node
  GOS Grade of Service
  GOSIP Government Open System Interconnection Profiles
  GPRS General Packet Radio Service
  GPRS General Packet Radio System
  GPS Global Positioning System
  GS Ground Start
  GSM Global System for Mobile (telecommunications)
  GTXC Global Telephone Exchange Carrier
  
  
  
  H
  
  
  HCDS High Capacity Digital Services
  HCV High Capacity Voice
  HDB3 High-Density Bipolar Three-Bit substitution
  HDLC High (level) Data Link Control
  HDML Handheld Device Markup Language
  HDSL High (Data Rate) Subscriber Line
  HDSL2 High (Data Rate) Subscriber Line
   (w/6dB noise margin)
  HDT Host Digital Terminal
  HEC Header Error Control
  HFC Hybrid Fiber Coax
  HLR Home Location Register
  HPC High Probability of Completion
  HSCWD High Speed Circuit Switched Data
  HTML Hypertext Markup Language
  HTTP Hypertext Transfer Protocol
  HTU HDSL Transmission Unit
  HTU-C HDSL Transmission Unit - Central Office
  HTU-R HDSL Transmission Unit - Remote
  
  
  
  I
  
  
  IAA Initial Address Acknowledgement
  IAB Internet Advisory Board
  IAC Initial Alignment Control
  IAD Integrated Access Device
  IAM Initial Address Message
  IAR Initial Address Reject
  IAT Integrated Access Terminal
  IC-POT Interexchange Carrier-Point of Termination
  ICCF Interexchange Carrier Compatibility Forum
  ICD International Code Designator
  ICI Inter-Carrier Interface
  ICIP Inter-Carrier Interface Protocol
  ICL Inserted Connection Loss
  ICMP Internet Control Message Protocol
  ICOT Inner City and Outstate Trunk
  IDCP Internet Device Control Protocol
  IDF Intermediate Distribution Frame
  IDLC Integrated Digital Loop Carrier
  IDS Intrusion Detection System
  IDT Information Distribution Company
  IDT Integrated Digital Terminal
  IDU Interface Data Unit
  IEEE Institute of Electrical and Electronics Engineers
  IG Interface Group
  IGP Interior Gateway Protocol
  IIME Intra-network, Inter-SSS Mapping Entity
  IIS Internet Information Server
  ISID Idle Signal Identification
  ISSP Interim Interswitch Signaling Protocol
  ILEC Incumbent Local Exchange Carrier
  ILEC Independent Local Exchange Carrier
  ILMI Interim Local Management Interface
  IMP Interface Message Processors
  IMS Interactive Multimedia Server
  IMSI International Mobile Subscriber Identity
  IN Intelligent Network
  INA Information Network Architecture
  INE Intelligent Network Element
  IO Inter-Office
  IOC Inter-Office Channel
  IP Intelligent Peripheral
  IP Internet Protocol
  IPSec Internet Protocol Security
  IPM Interpersonal Messaging System
  IPS Instructions Per Second
  ISDN Integrated Services Digital Network
  ISDNUP Integrated Services Digital Network User Part
  ISM Instrumentation, Scientific, and Medical
  ISO International Standards Organization
  ISP Internet Service Provider
  ISSI Inter-Switching System Interface
  ISSIP Inter-Switching System Interface Protocol
  ISUP ISDN User Part
  ITFS Instructional Television Fixed Services
  ITU International Telecommunication Union
  IWF Inter-Working Function
  IWU Inter-Working Unit
  IXC Interexchange Carrier
  
  
  
  J
  
  JIS Jurisdictional Interstate Service
  
  
  
  K
  
  
  
  
  L
  
  
  LAN Local Area Network
  LAN PHY LAN Physical Layer
  LANE Local Area Network Emulation
  LAP-D Link Access Protocol-D channel
  LAPB Link Access Protocol Balanced
  LAPD Link Access Procedure D channel
  LATA Local Access and Transport Area
  LAW Local Area Wireless
  LC Load Coil
  LC Loop Closure
  LCA Line Circut Address
  LCF Loop Current Feed
  LCFO Loop Current Feed Open
  LCGN Logical Channel Group Number
  LCN Logical Channel Number
  LCP Link Control Protocol
  LDAP Lightweight Directory Access Protocol
  LDC LATA Distribution Channel
  LDF Local Distribution Frame
  LDM Limited Distance Modem
  LDN Listed Directory Number 
  LDS Local Digital Switch
  LEC Local Exchange Carrier
  LEN Line Equipment Number
  LES LAN Emulation Services
  LET Line Equipment Transfer
  LGE Loop- or Ground-Start Exchange
  LGS Loop- or Ground-Start Subscriber
  LIDB Line Information Database
  LLB Line Loop Back
  LLC Logical Link Control
  LLSC signaling Link management; Link Set Control
  LMC Loop Maintenance Center
  LMDS Local Multipoint Distribution Service
  LMI Local Management Interface
  LMOS Loop Maintenance Operations System
  LMU Line Monitor Unit
  LNP Local Number Portability
  LO Loop Open
  LOF Loss Of Frame
  LOH Line Overhead
  LOP Loss Of Pointer
  LOP-L Loss Of Pointer - Line
  LOP-P Loss Of Pointer - Path
  LOP-V Loss Of Pointer - Virtual
  LOS Line of Sight
  LOS Loss Of Signal
  LOSW Loss Of Synchronous Word
  LPC Linear Predictive Coding
  LPDP Local Policy Decision Point
  LPU Line Protection Unit
  LRB Loop Reverse Battery
  LRN Local Routing Number
  LS Loop Start
  LSAC signaling Link management; Signaling Link Activity Control
  LSAP Link Service Access Point
  LSC Link State Control
  LSLA signaling Link management; Signaling Link Activation
  LSLD signaling Link management; Signaling Link Deactivation
  LSLR signaling Link management; Signaling Link Restoration
  LSMS Local Service Management System
  LSOA Local Service Order Administration
  LSSGR LATA Switching Systems Generic Requirements
  LSSU Link Status Signal Unit
  LSU Line Switch Unit
  LT Line Termination
  LTE Line Terminal Equipment
  LU Line Unit
  LULT Line Unit/Line Termination
  LUNT Line Unit Network Termination
  LXT Local Exchange Terminal
  
  
  
  M
  
  
  MAC Media Access Control
  MAN Metropolitan Area Network
  MAPDU Management Application Protocol Data Unit
  MAT Metropolitan Area Trunk
  MB Maintenance Busy
  MCU Multiplexer Control Unit
  MDCP Media Device Control Protocol
  MDF Main Distribution Frame
  MDS Multipoint Distribution Service
  MDTP Media Device Transport Protocol
  MF Multiple Frequency
  MFAS Multi-Frame Alignment Signal
  MGCP Media Gateway Control Protocol
  MRF Multilink Frame Relay
  MGCP Media Gateway Control Protocol
  MIB Management Information Base
  MIME Multipurpose Internet Mail Extension
  MIX Multimedia Internet Exchange
  MJU Multi-Junction Unit
  MLHG Multi-Line Hunt Group
  MLM Multi-Longitudinal Mode
  MLT Mechanized Loop Testing
  MLT Metalic Loop Test
  MMDX Multimedia Data Services
  MMDS Multichannel Multipoint Distribution Service
  MMDS Multimedia Data Services
  MO Managed Object
  MOC Managed Object Classes
  MOOS Manual Out-OF-Service
  MPLS Multi-Protocol Label Switching
  MPLS Multi-Protocol Layer Switching
  MPoA Multiple Protocol over ATM
  MSA Metropolitan Statistical Area
  MSDM Multipoint Substrate Data Mux
  MSO Multiple Service Operator
  MTAU Metalic Test Access Unit
  MTP Message Transfer Part
  MRVT MTP Routing Verification Test
  MTS Message Telephone System
  MTSO Mobile Telephone Switching Office
  MUB MultiUse Bearer service
  MULDEM MULtiplexer/DEMultiplexer
  MUX MULtiplexer/DEMultiplexer
  MVNO Mobile Virtual Network Operator
  
  
  
  N
  
  
  N(r) Receive Sequence Number
  N(s) Send Sequence Number
  NACK Negative ACKnowledgement
  NADH North American Digital Hierarchy
  NAK Negative Acknowledgement
  NANP North American Numbering Plan
  NAS Network Attached Storage
  NAT Network Attached Storage
  NAT Network Address Translation
  NC Network Channel
  NCC Network Communications Controller
  NCI Network Channel Interface
  NCP Network Control Point
  NCP Network Control Protocol
  NCTE Network Channel Terminating Equipment
  NDF New Data Flag
  NE Network Element
  NEXT Near End Cross Talk
  NFAS Non-associated Facility Signaling
  NGDLC Next Generation Digital Loop Carrier
  NGN Next Generation Network
  NGW Network Gateway
  NI Network Interface
  NI Network Interface
  NI-1 National ISDN-1
  NI-2 National ISDN-2
  NIC Network Interface Card
  NIU Network Interface Unit
  NLPID Network Level Protocol ID
  NLOS Near Line of Sight
  NMA Network Management and Administration
  NMA Network Monitoring and Analysis
  NMC Network Management Center
  NML Network Management Layer
  NMP Network Management Protocol
  NMS Network Management System
  NNI Network Node Interface
  NNI Network-to-Network Interface
  NNTP Network News Transport Protocol
  NOC Network Operations Center
  NOS Network Operating System
  NOTE Network Office Terminating Equipment
  NPA Numbering Plan Area
  NPAC Number Portability Administration Center
  NPDU Network Protocol Data Unit
  NPRN Network Performance Report Message
  NPI Numbering Plan Identification
  NRIC National Reliability and Interoperatability Council
  NRZ Non-Return to Zero
  NSA Non-Service Affecting
  NSC Network Service Center
  NSF Network Specific Facilities
  NSI Network Service Interface
  NSP National Signaling Point
  NTE Network Terminating Equipment
  NTT Numbered Test Trunk
  NYIIX New York International Internet Exchange
  
  
  
  O
  
  
  
  OADM Optical Add-Drop Multiplexer
  OAM Operations, Administration, and Maintenance
  OAM&P Operations, Administration, Maintenance
   & Provisioning
  OAMP Operations, Administration, Maintenance
   Provisioning
  OC-n Optical Carrier (e.g., OC-3)
  OC-x Optical Carrier (e.g., OC-3)
  OCPD Over Current Protection Device
  OCU Office Channel Unit
  OCUDP Office Channel Unit Data Port
  OE Originating Equipment
  OEO Optical-Electrical-Optical
  OFA Optical Fiber Amplifier
  OFDM Orthogonal Frequency Division Multiplexing
  OIM Operations Interface Module
  OLNS Originating Line Number Screening
  OLP On-Line Provisioning
  OM Operational Measurement
  ONU Optical Network Unit
  OOD Object Oriented Design
  OOF Out Of Frame
  OOS Out Of Service
  OOS Out Of Synchronization
  OPN Outage Performance Monitoring
  OPS/INE Operations System/Intelligent Network Element
  OPX Off Premise Extension
  OR Office Regenerator
  ORB Office Repeater Bay
  OS Operations System
  OSI Open System Interconnection
  OSI Open System Interface
  OSPF Open Shortest Path First
  OSS Operation Support System
  OSS Operator Services System
  OTC Operating Company
  OTDR Optical Time Domain Reflectometer
  OUI Organizationally Unique Identifier
  
  
  
  P
  
  
  P/F Poll/Final Bit
  PA Pointer Adjustment
  PABX Private Automatic Branch Exchange
  PAD Packet Assembler / Disassembler
  PAM Pass Along Message
  PAM Pulse Amplitude Modulation
  PAW Personal Area Wireless
  PBD Power Board
  PBX Private Branch Exchange
  PCF Point Coordination Function
  PCI Protocol Control Information
  PCM Pulse Code Modulation
  PCMCIA Personal Computer Memory Card International Association
  PCS Personal Communications Services
  PCTF Per-Call Test Failure
  PCU Packet Control Unit
  PD Protocol Discriminator
  PDH Plesiochronous Digital Hierarchy
  PDI-P Payload Defect Indicator - Path
  PDI V Payload Defect Indicator - Virtual
  PDN Public Data Network
  PDP Policy Decision Point
  PDU Protocol Data Unit
  PEP Policy Enforcement Point
  PFDL Policy Framework Definition Language
  PFM Packet Forwarding module
  PGTC Pair Gain Test Controller
  PGS Pair Gain System
  PHS Packet Handling System
  PHY Physical Layer (abbrev.)
  PHY-PCI Physical Layer Protocol Control Information
  PHY-SAP Physical Layer-Service Access Point
  PHY-SDU Physical Layer-Service Data Unit
  PHYM Physical Layer Management
  PIB Policy Information Base
  PID Path Identification
  PIP Pre-Impulsing Pulse
  PJC Pointer Justification Count
  PKI Public Key Infrastructure
  PL Private Line
  PLA Programmable Logic Array
  PLAR Private Line Automatic Ringdown
  PLB Payload Loop Back
  PLC Power Line Carrier
  PLCP Physical Layer Convergence Protocol
  PLS Private Line service
  PM Performance Monitoring
  PMD Physical Media Dependent
  PNNI Private Network Node Interface
  POC Positive Outage Control
  POH Path Overhead
  PON Passive Optical Network
  POP Point Of Presence
  POP Post Office Protocol
  PoS Packet Over SONET
  POS Point of Sale
  POT Point Of Termination
  POTS Plain Old Telephone Service
  POTS Plain Old Telephone System
  PPP Point to Point Protocol
  PPSN Public Packet Switched Network
  PRA Primary Rate Access
  PRD Pseudo-Random Downstream
  PRI Primary Rate Interface (ISDN)
  PRBS Pseudo-Random Binary Sequence
  PRBS Pseudo-Random Bit Sequence
  PRM Performance Report Message
  PRS Primary Reference Source
  PRU Pseudo-Random Upstream
  PSELFEXT Power Sum Equal Far End Cross Talk
  PSDM Premium Substrate Data Mux
  PSDS Public Switched Digital Service
  PSK Pulse Shift Keying
  PSNEXT Power Sum Near End Cross Talk
  PSTN Public Switched Telephone Network
  PSX Power System Exchange
  PT Payload Type
  PTE Path Terminal Equipment
  PTI Payload Type Indicator
  PTT Postal, Telephone and Telegraph Authority
  PVC Permanent Virtual Circuit
  
  
  
  Q
  
  
  QAM Quadrature Amplitude Modulation
  QoS Quality of Service
  QPA Quality Performance Analysis
  QRS Quasi Random Signal
  QRSS Quasi Random Signal Sequence
  
  
  
  R
  
  
  R Ring
  RAD Remote Antenna Driver
  RAI Remote Alarm Indication
  RALB Resource All Busy
  RARP Reverse Address Resolution Ptotocol
  RAS Remote Access Server
  RAS Remote Access Service
  RASP Remote Antenna Signal Processing
  RBOC Regional Bell Operating Company
  RBS Robbed Bit Signaling
  RC Retransmission Counter
  RCV Receive
  RD Routing Domain
  RDF Remote Distribution Frame
  RDI Remote Defect Indicator 
  RDI-L Remote Defect Indicator - Loop
  RDI-P Remote Defect Indicator - Path
  RDI-V Remote Defect Indicator - Virtual
  RDT Remote Digital Terminal
  RE Relaying Entity
  REN Ringer Equivalent Number
  RFCs Request For Comments
  RFI Radio Frequency Interference
  RIP Routing Information Protocol
  RLCI Receive Line Clock Input
  RLDI Receive Line Data Input
  RM Resource Management
  RNC Radio Network Controller
  RNR Receive Not Ready
  ROH Receiver Off Hook
  ROS Remote Operations Service
  ROSE Remote Operations Service Element
  RPR Resilient Packet Ring
  RR Receive Ready
  RSS Remote Switching Sites
  RSS Remote Switching System
  RSU Remote Switching Unit
  RT Remote Terminal
  RTA Rural Trading Area
  RTB Retransmission Buffer
  RTPC signaling Route management; transfer Prohibited Control
  RTR Retransmission indicator
  RTS Request To Send
  RTU Remote test Unit
  RX Receive
  RZ Return to Zero
  
  
  
  S
  
  
  SAA Service Adaptive Access
  SABME Set Asynchronous Balance Mode Extender
  SAN Storage Area Network
  SAM Service Access Multiplexer
  SAMI SAM Interface
  SAN Storage Area Network
  SAP Service Access Point
  SAPI Service Access Point Indetifier
  SAR Segmentation And Reassembly
  SAR-PDU Segmentation and Reassembly PDU
  SBX Small Business Exchange
  SC-FDE Single Carrier Frequency Domain Equalization
  SCC Switching Control Center
  SCCP Signaling Connection Control Part
  SCCS Switching Control Center System
  SCE Service Creation Environment
  SCP Service Control Point
  SDCU Synchronous Data Channel Unit
  SDH Synchronous Digital Hierarchy (SONET)
  SDLC Synchronous Data Link Control
  SDP Session Description Protocol
  SDM Substrate Data Mux
  SDN Software Defined Network
  SDP Service Definition and Provisioning
  SDP Session Description Protocol
  SDSL Symmetric Digital Subscriber Line
  SEAL Simple and Efficient Adaptation Layer
  SEL Selector Field
  SEFL Single Ended Fault Locating
  SEP Signaling End Point
  SES Severe Errored Seconds
  SF Single Frequency
  SF Status Field
  SF Superframe
  SGCP Simple Gateway Control Protocol
  SGML Standard Generic Markup Language
  SGSN Serving GPRS Support Node
  SH SAR Sublayer Header
  SHR Self-Healing Ring
  SINAD Signal-to-Noise Plus Distortion (ratio)
  SI Service Information octet
  SIB Status Indication B (busy)
  SIE Status Indication E (emergency alignment)
  SIF Signaling Information Field
  SIN Status Indication N (normal alignment)
  SIO Status Indication O (out of alignment)
  SIP Session Initiation Protocol
  SIT Special Information Tone
  SL Service Layer
  SLA Service Level Agreement
  SLIC Subscriber Line Interface Card
  SLIP Serial Line Interface Protocol
  SLIP Serial LIne Internet Protocol
  SLS Single Link Set
  SMASE Systems Management Application Service Element
  SMC Switch Maintenance Center
  SMDF Subscriber Maintenance Distributing Frame
  SMDS Switched Multi-megabit Data Service
  SML Service Management Layer
  SMS Service Management System
  SMS Short Message Service
  SMTP Simple Mail Transfer Protocol
  SNA Systems Network Architecture
  SNAP Sub-Network Access Protocol
  SNI Subscriber-Network Interface
  SNMP Simple Network Management Protocol
  SNR Signal to Noise Ratio
  SO Serving Office
  SO/S Smart Omni-Orderwire Station
  SOA Service Order Administration
  SOH Section Overhead
  SOHO Small Office/Home Office
  SONET Synchronous Optical Network
  SP SAR Sublayer Payload
  SP Signaling Point
  SPC Stored Program Control
  SPCS Stored Program Control System
  SPE Synchronous Payload Envelope
  SPID Service Profile Identifier
  SPRM Supplementary Performance Report Message
  SPQR Senatus et Populus Qui Roma
  SQR Signal to Quantizing noise Ratio
  SRDM Sub Rate Data Multiplexer
  SRL Singing Return Loss
  SRM Signaling Route Management
  SRP Spatial Reuse Protocol
  SRTS Synchronous Residual Time Stamp
  SS Supervisory Center
  SS7 Signaling System No.7
  SSCS Service Specific Convergence Sublayer
  SSL Secure Socket Layer
  SSP Service Switching Point
  SSP SCCP Subsystem Prohibited
  SSS SMDS Switching System
  ST SAR Sublayer Trailer
  STDM Statistical Time Division Multiplexer
  STE Section Terminal Equipment
  STP Signaling Trasfer Point
  STM Synchronous Transfer Module
  STP Shielded Twisted Pair
  STP Signaling Transfer Point
  STS Synchronous Transfer Signal
  STS-1 Synchronous Transport Signal (level)-1
  SU Signal Unit
  SUERM Signaling Unit Error Rate Monitor
  SVC Switched Virtual Call
  SVC Switched Virtual Circuit
  SVC Switched Virtual Connection
  SWAP Shared Wireless Access Protocol
  SWF Switched Fractional
  SWF-DS1 Switched Fractional DS1
  SYN Synchronization Character
  SYNTRAN SYNchronous TRANsmission
  
  
  
  T
  
  
  T Tip
  TA Terminal Adapter
  TAC Terminal Access Circuit
  TACS Total Access Communications System
  TALI Transport Adapter Layer Interface
  TAP Test Access Path
  TAPI Telephony Application Programming Interface
  TASI Time Assigned Speech Interpolation
  TAU Test Access Unit
  TAU Time Assignment Unit
  TC Terminating Channel
  TC Transmission Convergence
  TCA Threshold Crossing Alert
  TCAP Transaction Capabilities Application Part
  TCM Tandem Connection Maintenance
  TCP Transmission Control Protocol
  TCP Transport Control Protocol
  TCP/IP Transmission Control Protocol/Internet Protocol
  TDM Time Division Multiplexing
  TDMA Time Division Multiple Access
  TDR Time Domain Reflectometer
  TE Terminal Equipment
  TEI Terminal Endpoint Identifier
  TELRIC Total Element Long-Run Incremental Cost
  TFO Tandem Free Operation
  TFTP Trivial File Transfer Protocol
  THL Trans-Hybrid Loss
  TL1 Transaction Language One
  TLP Transmission Level Point
  TLPU Telecommunications Line Protector Unit
  TLWS Trunk and Line Work Station
  TIMS Transmission Impairement Measuring Set
  TIRKS Trunk Integrated Records Keeping System
  TLP Transmission Level Point
  TMC Time slot Management Channel
  TMN Telecommunications Management Network
  TN Telephone Number
  TNS Transit Network Selection
  TOH Transport Overhead
  ToS Type of Service
  TOS Testing Operation System
  TPDU Transport Protocol Data Unit
  TPI Tip-Party Identification
  TRA Traffic Restart Allowed
  TRU Transmit/Receive Unit
  TRW Traffic Restart Waiting
  TRX Tandem Repeater Exchange
  TSC Test System Controller
  TSDU Transport Service Data Unit
  TSGR Transport System Generic Requirements
  TSI Time Slot Interchange
  TSID Test Signal Identification
  TSR Terabit Switch Router
  TTU Tandem T-1 Unit
  TX Transmit
  
  
  
  U
  
  
  UA Unnumbered Acknowledgement
  UAS Unavailable Seconds
  UCIC Unequipped Circuit Identification Code
  UDC Universal Digital Channel
  UDLC Universal Digital Loop Carrier
  UDP User Datagram Protocol
  UI Unit Interval
  UI Unnumbered Information (frame)
  UMTS Universal Mobile Telecommunications System
  UNI User Network Interface
  UNICODE UNIversal trunk-out-of-service Code
  UPA User Part Available
  UPC Usage Parameter Control
  UPS Uninterruptible Power System
  UPT User Part Test
  UPU User Oart Unavailable
  URL Uniform Resource Locator
  URL Universal Resource Locator
  USI User System Interface
  USOC Universal Service Order Code
  USOC Universal Service Ordering Code
  UTP Universal Twisted Pair
  UVG Universal Voice-grade Channel Unit
  
  
  
  V
  
  
  V(A) Acknowledge state Variable
  V(M) Recovery state Variable
  V(R) Receive state Variable
  V(S) Sent state Variable
  VAZO Violating All-Zero Octet
  VBR Variable Bit Rate
  VC Virtual Channel
  VC Virtual Circuit
  VC Virtual Container
  VCC Virtual Channel Connection
  VCI Virtual Channel Identifier
  VCL Virtual Channel Link
  VDSL Very high bit rate Digital Subscriber Line
  VDT Video Dial Tone
  VG Voice Grade
  VF Voice Frequency
  VLAN Virtual Local Area Network
  VMWI Visual Message Waiting Indicator
  VN Virtual Network
  VNS Virtual Network System
  VoATM Voice Over ATM
  VoB Voice Over Broadband
  VOD Video On Demand
  VoDSL Voice Over DSL
  VOFDM Vector Orthogonal Frequency Division Multiplexing
  VoFR Voice Over Frame Relay
  VoIP Voice Over Internet Protocol
  VOP Voice Over Packet
  VP Virtual Path
  VPC Virtual Path Connection
  VPI Virtual Path Identifier
  VPN Virtual Private Network
  VPT Virtual Path Terminator
  VPX Virtual Path Cross-connect
  VQC Vector Quantizing Code
  VQC Voice Quantizing Code
  VQL Vector Quantizing Level
  VQL Variable Quantizing Level
  VSAT Very Small Aperature Satellite
  VSAT Voice over Satellite
  VT Virtual Tributary
  VXML Voice Extensible Markup Language
  
  
  
  W
  
  
  W-DCS Wideband Digital Crossconnect System
  WAN Wide Area Network
  WAN PHY WAN Physical Layer
  WAP Wireless Application Protocol
  WATS Wide Area Telephone Service
  WAW Wide Area Wireless
  WDCX Wideband and Broadband Digital Cross-connect
  WDM Wavelength Division Multiplexing
  WECA Wireless Ethernet Compatibility Alliance
  WEP Wired Equivalent Privacy
  WFA Work Force Administration
  WFQ Weighted Fair Queuing
  WML Wireless Markup Language
  
  
  
  X
  
  XA-FR Exchange Access Frame Relay
  XA-SMDS Exchange Access Switched Multi-megabit Data Service
  XAME eXchange Access Mapping Entity
  XC Crossconnect
  XI X Identification (frame)
  XID Exchange Identification
  XML Extensible Markup Language
  XO Extended Office
  
  
  
  Y
  
  
  
  
  Z
  
  
  ZBTSI Zero Byte Time Slot Interchange
  ZCS Zero Code Suppression
  
  
  


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