Table of Contents
Advertisement
CO/CO Line/Trunk Line
CO stands for Central Office, typically the location where the phone company stores their telco equipment. CO lines are
physically run from this location to a business or home. A CO line is a line with a phone number (i.e. 973-412-4444) that
carries calls into and out of a residence or business. In a business environment, these lines are typically connected to a PBX,
allowing phones connected to the PBX to carry phone calls into and out of the building.
Codec
Codec is an acronym for Compression/Decompression. A codec is software or hardware that compresses digital data into a
smaller format to allow for faster transmission.
Compression
Compression is a manner of reducing the size of digital data to enable faster transmission.
D
DSL (Digital Subscriber Line)
DSL is a technology that greatly increases the digital capacity of normal telephone lines. DSL features "always-on" functionality
and is available in a variety of formats.
DNS (Domain Name System) Server
A DNS server stores IP addresses and their corresponding domain names.
DTMF (Dual Tone Multi Frequency)
DTMF refers to the audio signals generated through touch-tone dialing.
E
E-1
E-1 is the European standard digital interface for high capacity transmission of telephony and data communications. E-1
transmits at 2.048 Mbps and features two signaling channels and thirty voice channels.
Ethernet
Ethernet is the most widely used method to access a LAN. Ethernet is so common that general terms such as "LAN connection"
and "network card" usually imply an Ethernet connection. Different types of Ethernet include 10BaseT and 100BaseT.
Extension Lines
Extension lines refer to the individual telephone stations on a PBX that have a separate extension number. An extension line is
a line to the PBX, not an actual outside telephone line. Extension lines can be connected to a multi-port extension card that is
attached to the PBX. When one extension is used to dial another, the PBX acts as a voice router to transport and carry the call
to the appropriate extension.
34
Advertisement
Table of Contents
