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Vonage Customer Reviews
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Review: My First Day With Vonage, Excellent!
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Vonage Customer Review: One month with Vonage, and...
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Vonage Reviews

VoIP Acronyms

Last updated: 18 March 2005






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


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/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


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


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

DMZ    DeMilitarized Zone

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)


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


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


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


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


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


JIS    Jurisdictional Interstate Service



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


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(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


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/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


QAM    Quadrature Amplitude Modulation

QoS    Quality of Service

QPA    Quality Performance Analysis

QRS    Quasi Random Signal

QRSS    Quasi Random Signal Sequence


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


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

STUN    Simple Traversal of UDP through NATs

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    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


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(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-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


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



ZBTSI    Zero Byte Time Slot Interchange

ZCS    Zero Code Suppression

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