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A
A&B
ACK
ACM
acoustic coupler
adaptive answering
Adaptive Communication Environment
Adaptive Digital Pulse Code Modulation
addressed call mode
addressee
AM
amateur packet radio
America On-Line
Amplitude Modulation
asymmetrical modulation
Asymmetric Digital Subscriber Line
asynchronous
Asynchronous Communications Interface Adapter
Asynchronous Transfer Mode
ATM
attenuation
audiographic teleconferencing
automatic baud rate detection
Automatic Number Identification
Automatic Repeat Request
B
bandwidth
bang path
Basic Rate Interface
baud
Baudot code
beamer
bearer channel
BER
bipolar
bit rate
bits per second
Bose-Chaudhuri-Hocquenghem Code
broadband
broadcast quality video
broken arrow
bulletin board system
C
cable modem
callback
Call Unix
CAP
capacity
Carrierless Amplitude/Phase Modulation
carrier signal
CAS
CCS
Cellular Digital Packet Data
central office
Central office exchange service
channel service unit
channel service unit/data service unit
checksum
CHEOPS
circuit
circuit switching
Clover
Code Division Multiple Access
coder/decoder
Committed Data Rate
Committed Information Rate
common carrier
Common Intermediate Format
communications port
communications software
communication system
Computer Telephone Integration
concentrator
Conferencing over IP
continuous wave
cost control callback
CTI
CTS
CU-SeeMe
Customer Information Control System
cutover
D
data channel
Data Communication Equipment
Data Over Cable Service Interface Specification
Dataphone Digital Service
data rate
data service unit
Data Terminal Equipment
Data Terminal Ready
data transfer rate
dedicated line
demodulation
Dialled Number Identification Service
digital carrier
digital certificate
Digital Data Service
Digital Enhanced Cordless Telecommunications
Digital Radio Mondiale
Digital Simultaneous Voice and Data
Digital Subscriber Line
Digital Switched Network
diplex
Direct Inward Dialing
directional coupler
double-duplex
DS0
DS1
DS1C
DS2
DS3
DSL
DS level
DSU
Dual Tone Multi Frequency
duplex
E
5ESS Switch
E1
E2
E3
E4
E5
E-carrier system
Eggdrop
EIA-232
EIA-232C
EIA-422
EIA-423
EIA-449
EIA-485
EIA-530
electronic commerce
electronic data interchange
electronic funds transfer
F
facsimile
fall back
fall forward
Fax over IP
fibre channel
flow control
FM
FRAD
Frame Check Sequence
Frame Relay
Frame Relay Access Device
frequency division multiplexing
Frequency Modulation
Frequency Shift Keying
full-duplex
G
General Packet Radio Service
Global Positioning System
Global System for Mobile Communications
go voice
H
H.323
half-duplex
hardware handshaking
Hayes-compatible
hello packet
High bit-rate Digital Subscriber Line
High Speed Circuit Switched Data
High-speed Net Connect
high speed serial interface
host
I
in-band signalling
information superhighway
Integrated Services Digital Network
Intelsat
Interactive Voice Response
inter-exchange carrier
intermodulation distortion
Internet backbone
Internet Telephony Service Providers
IP Telephony
isochronous
J
K
56k line
Kermit
L
latency
leased line
line conditioning
line noise
Link State Routing Protocol
local echo
local exchange carrier
local loop
longitudinal parity
Longitudinal Redundancy Check
low earth orbit
M
Manchester encoding
marshalling
Media Gateway Control Protocol
Message Passing Interface
Microsoft Access
Mobile Subscriber Integrated Services Directory Number
modem
Morse code
Multimedia Integrated Conferencing for European Researchers
multiplexing
Multi-User Shared Hallucination
N
negative acknowledgement
noise
noise shaping
null modem
Nyquist Theorem
O
optical fibre
out-of-band
overhead
P
packet radio
packet switching
parity
parity bit
parity error
PCN
PC-TALK III
Personal Communication Services
phacker
Phonetastic
Physical Transport Network
Plain Old Telephone Service
plesiochronous
Plesiochronous Digital Hierarchy
Point-to-Point Protocol
Point-to-Point Protocol over Ethernet
Point-to-Point Tunneling Protocol
Portable AIRTIME
Post, Telephone and Telegraph administration
Pretty Amazing New Stuff
Private Automatic Branch eXchange
Private Branch Exchange
Private Manual Branch eXchange
Procomm
protocol analyser
PSDN
PSK
Public Switched Telephone Network
push
Q
quadruplex
quality of service
Quarter CIF
Quick Mail Queueing Protocol
Quick Mail Transfer Protocol
R
RAS
RealAudio
recipient
redundancy
reliable communication
Remote Access Services
remote echo
Remote Spooling Communication Subsystem
repeater
Return To Zero
RJ-11
root bridge
RS-232D
RSCS
S
screen popping
SDLC
serial line
Serial Line Internet Protocol
Serial Peripheral Interface
serial port
service provider
set-top box
signalling rate
signal-to-noise ratio
Simple Gateway Control Protocol
simple multicast protocol
simplex
simplex printer
Simplified Multicast Routing Protocol
single-duplex
Single-line Digital Subscriber Line
SNR bandwidth product
social network
software handshaking
spread spectrum communications
squirt the bird
stac compression
statistical time division multiplexing
stream
stream
streaming
synchronous
Synchronous Data Link Control
Synchronous Digital Hierarchy
T
T1
T3
tail circuit
T-carrier system
TEI
telco
Telecommunications Device for the Deaf
Telephone Application Program Interface
telephony
Telephony Application Programming Interface
Telephony User Interface
Telocator Alphanumeric Protocol
terminal emulator
throughput
time division multiplexing
TUI
two-binary, one-quaternary
U
Universal Asynchronous Receiver/Transmitter
Universal Communications X
Upper Side-Band modulation
USB
USB Adapter Card Support
User Network Interface
uuencode
V
V.10
V.11
V.25
V.25 bis
V.28
V.29
V.32
V.32bis
V.35
V.42
V.42bis
Vertical Redundancy Check
Very high bit-rate Digital Subscriber Line
Very Small Aperture Terminal
V.FC
video dial tone
Video on Demand
visible bell
vocoder
voice mail
Voice over IP
VSAT
V series
videoconferencing
W
wavelength division multiplexing
Wide Area Telecommunications Service
wiki
X
X.21
XMODEM
Y
Z