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