Basic about Telecom & PBX

Basic abbreviations about Telecom & PBX are often used in technical articles or reports, or talk with a technician.

A  
ACR Absolute Category Rating
ACD Automatic Call Distribution
ADPCM Adaptive Differential Pulse Code Modulation
ANI Automatic Number Identification
ATM Asynchronous Transfer Mode
   
C  
C.O. Line Central Office Line
CAP Competitive Access Protocol
CBR Constant Bit Rate
CIOA Classical IP over ATM
CNG Comfort Noise Generation
CODEC Compressor/decompressor
CPE Customer Premises Equipment “Individual user”
CSU/DSU Channel Service Unit/Digital Service Unit
CTI Computer Telephony Integration
   
D  
DHCP Dynamic Host Configuration Protocol
DDS Diffserv Differentiated Services
DSP Domain Name System
DNS DNS Digital Signal Processor
DSS/BLF Direct Station Select /Busy Lamp Field
DTMF Dual Tone Multiple Frequency
   
E  
EDI Electronic Data Interchange – a series of standards which provide computer to computer exchange of business documents between different companies’ computer over phone lines
   
F  
FAE Field Application Engineer
FCC Federal Communication Commission
FDDI II Fiber Distributed Data Interface II
FR Frame Relay
FRAD Frame Relay Access Device
FTP File Transfer Protocol
FTTC FTTH Fiber to the Curb
FXO Fiber to the Home
FXS Foreign Exchange Office
  Foreign Exchange Station
   
G  
G.711 Codinng of speech at 64 Kbps
G.723.1 Codinng of speech at 5.3 / 6.3 Kbps
G.729a Codinng of speech at 8 Kbps
GSM Global System for Mobile Communications
GUI Graphical User Interface
   
H  
H.323 A standard approved by the International Telecommunication Union (ITU) that defines how audiovisual conferencing data is transmitted across networks.
DLC/SDLC HHigh Data Link Control/Synchronous Data Link Control
HDSL High-bit-rate Digital Subscriber Line
HFC Hybrid Fiber Coaxial
HomePNA Home Phone Networking Alliance
   
I  
IETF Internet Engineering Task Force
IP Internet Protocol
IPPBX Internet Protocol-Private Branch Exchange
ISA Integrated Services Architecture
ISDN Integrated Services Digital Network
ISP Internet Service Provider
ITS Internet Telephony Server
ITSP Internet Telephony Service Provider
ITU-T International Telecommunications Union-Telecommunications
IVR Interactive Voice Response
IXC Interexchange Carrier
   
L  
LAN Local Area Network
LANE LAN Emulation
LDAP Lightweight Directory Access Protocol
LEC Local Exchange Carrier
LIS’s Logical IP Subnetworks
   
M  
MBR Minute Bit Rate
MGCP Media Gateway Control Protocol
MIPS Million Instructions Per Second
MIS Management Information System
MOS Mean Opinion Score
MPEG Moving Pictures Expert Group
MPLS Multiprotocol Label Switching Specification
MPOA Multiprotocols over ATM
   
N  
NT Network Termination or it can mean New Technology just like Windows NT
NTI Network Termination Type 1 – a small box that attaches to an ISDN BR line
   
O  
ODM Original Designing Manufacturer
OEM Original Equipment Manufacturer
   
P  
PBX Private Branch Exchange, also known as PABX – Private Automatic Branch Exchange
PCM Pulse Code Modulation
PDU Protocol Data Units – also called Datagrams
PING Packet Internet Groper
POP Point of Presence
POTS Plain Old Telephone Service
PPP Point-to-Point Protocol
STN Public Switched Telephone Network
   
Q  
QoS Quality of Service
   
R  
RSVP Reservation Protocol
RTCP Real Time Transport Protocol Control Protocol
RTP Real Time Transport Protocol
RTSP Real Time Streaming Protocol
   
S  
SIP Session Initiation Protocol
SIVR Speaker-Independent Voice Recognition
SMTP Simple Mail Transfer Protocol – for email
SNA System Network Architecture
SNMP Simple Network Management Protocol
SOC System on a Chip
SONET Synchronous Optical Network
   
T  
T1 1.544 Mbps = 24*64 Kbps
TAPI Telephony Application Programming Interface
TCO TCP/IP Total Cost of Ownership
TDM Transmission Control Protocol/Internet Protocol
TTL links Time Division Multiplexed links
TUI The Time To Live
  Telephone User Interface
   
U  
UDP User Datagram Protocol
UnPBX PC-based PBX using computer instead of networking
   
V  
VAD Voice Activity Detection
VAR Value Added Reseller
VBR Variable Bit Rate
VIC Voice Interface Card
VOD Video on Demand
VoIP Voice over IP
VON Voice on Data Network
VPN Virtual Private Networking
   
W  
WAN Wide Area Network
WAP Wireless Application Protocol