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