Basic about Telecom & PBX

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

What is PBX phone system?

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