Glossary of Terms
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Admission of ordinary shares to trading on AIM, becoming effective in accordance with Rule 6 of the AIM Rules.
Address of Record. Generally refers to the telephone line. Users might relate an extension to an AOR.
Average Revenue Per User.
Bridged (or Bridge) Line Appearance. A copy of another user’s Call Appearances enabled by PBX and IP call control platforms. Also referred to as SCA or Shared Call Appearance.
Busy Lamp Field. A device that shows which phones in a system are in use, ringing, or on hold.
Compound Annual Growth Rate.
Category of Performance. Determines LAN cabling carrier capacity. The higher the number, the higher the capacity.
Cabling of either 22 or 24 gauge. Can support applications up to 16 MHz carrier frequency. Applications include POTS, ISDN, T-1, and 10Base-T Ethernet. Has insufficient bandwidth to carry VoIP traffic.
LAN cabling which is available in varying gauges. Can support applications up to 100 MHz carrier frequency. Applications include 10/100Base-T Ethernet, and 155 Mbps ATM LANS. Cat5e (enhanced) is commonly installed for LAN connectivity, and has enough bandwidth to carry both voice and data traffic.
A centralized telephone service provided by a telephone company, where a portion of the telephone exchange switch capacity is used to provide the equivalent of a PBX service for the customer.
Customer Premises Equipment. Terminal equipment connected to the telephone network and residing on the customer’s premises. Termed CTE – Connected Telecommunications Equipment – in Europe.
Channel Service Unit/Data Service Unit. A customer-premise device that terminates a digital channel.
Dynamic Host Configuration Protocol. A TCP/IP protocol that enables PCs to get temporary or permanent IP addresses from centrally administered servers.
Rules that establish the expected number and pattern of digits for a telephone number.
Do Not Disturb. A handset feature enabled by a PBX or IP call control platform that prevents incoming calls from ringing through to the user’s phone.
Digital Subscriber Line. High speed Internet connection over regular telephone lines.
Dual Tone Multi Frequency. The technology that generates a combination of two tones, one high frequency and one low, when dialing a touchtone or push button phone.
Search citel.com for everybody wins (all lower case) and see what happens.
File Transfer Protocol. A TCP/IP protocol that is commonly used to access Internet-linked file archives around the world.
Foreign Exchange Office. In VoIP, FXO signifies a port or line on the handset or call control platform that connects to the PSTN.
Algorithm designed to transmit voice at digital bit rate 64 Kbps (no compression).
Algorithm designed to transmit voice at digital bit rates 32 and 24 kbps. Also transmits less commonly at 40 or 16 kbps.
Widely supported new voice algorithm. Transmits, codes, and decodes voice at 8 Kbps (high compression).
Graphical User Interface. A generic name for any computer interface that substitutes graphics for characters.
HyperText Markup Language. The software language used to create World Wide Web pages.
Integrated Access Device.
Internet Protocol. A standard-describing software that keeps track of the Internet’s addresses for different nodes, routes outgoing messages, and recognizes incoming messages. See TCP/IP.
Internet Protocol Private Branch eXchange. A customer-premise call control server that routes voice traffic. Connects via Ethernet LAN and sends voice in IP packets.
Internet Service Provider. A vendor who provides access for customers to the Internet and the World Wide Web. Almost all Hosted VoIP Service Providers are also Internet Service Providers. Hosted VoIP SPs may also be referred to as a TSP (Telephone Service Provider) or ITSP (Internet Telephone Service Provider).
Local Area Network. A communications network, most commonly Ethernet, connecting devices inside a building or campus.
Liquid Crystal Display. Common technology used in flat-panel computer monitors, televisions, and some phones.
Light emitting diode. Commonly used for calculators and computer devices.
Moves, Adds, and Changes. Also short for Media Access Control address, a unique identifier attached to most network adapters. Of course, Mac is also short for Macintosh, the best computers in the world, made by Apple, Inc.
Private Branch eXchange. A circuit switched telephony server. PBXs are premise-based hardware that serve a single enterprise or office. PBXs often use proprietary digital-line protocols, although some are analog-based.
The raising of funds through institutional investors and other investors.
Power Over Ethernet. A standard (802.3af) that powers IP phones via the LAN cabling instead of a wall outlet.
Plain Old Telephone Service. The basic service supplying standard single line telephones, telephone lines, and access to the PSTN.
Rules controlling data flow in a communication system.
Public Switched Telephone Network. This is the telephone network based on copper wire that carries analog and digital voice traffic. The phone company’s traditional system of completing a call.
Power Supply Unit. Any integrated or external module or connector that supplies power to a device.
Quality of Service. There are two QoS definitions that apply to enterprise telephony. First, QoS is a control mechanism that prioritizes data and voice traffic. QoS capabilities are built into some routers and switches or can be delivered via unique devices. Next, QoS is a set of standards for subscriber voice quality, including clarity, volume, echo, delay, etc. Enterprises with digital networks monitor their established standards by setting and reviewing error conditions.
Registered Jacks. Telephone and data plugs registered with the FCC.
A six conductor modular jack, typically wired for four conductors. It is the jack on home phone lines, and is the most common telephone jack in the world.
25-pair Amphenol-type connector, commonly connecting Key systems and PBXs.
The common term for 8P8C modular plugs and jacks with eight conductors, crimped to Cat5e or Cat6 cable and used in Ethernet.
Return On Investment.
An interface between two networks. Routers buffer and forward data packets across a network.
A set of standards for communicating between computers, terminals, and modems.
Shared Call Appearance. See BLA.
Session Initial Protocol. An standards-based telecommunications protocol that sets up phone calls, multimedia conferencing, instant messaging, and other types of real-time communications on the Internet. SIP can be used with TCP, UDP and other transports.
A technology that enables point-to-point Voice over IP connections.
Service Level Agreement. An agreement between a user and a service provider, defining the nature of the service provided and establishing a set of metrics to measure the level of service provided.
Small to Medium-sized Enterprise. Also referred to as SMB (Small to Medium-sized Business).
Simple Network Management Protocol. The most common method of managing networks.
Small Office/Home Office.
For telecommunications purposes, a switch is a device that looks at the destination address of voice data and opens or closes circuits and selects paths.
Total Addressable Market.
Total Cost of Ownership.
Transmission Control Protocol/Internet Protocol. Together, these two are the protocol used to make connections on the Internet, as well as across many other networks.
Time Division Multiplex. A technique for transmitting a number of separate data and voice signals simultaneously over one communications medium.
A program that allows connections to other computers on the Internet. Used for remote configuration and management.
Telephone VoIP Adapter. Enables digital and analog handsets to operate on an IP telephony platform.
Uninterruptible Power Supply. A device that supplies clean, consistent power to a phone system or computer when the power company source shuts down or is inconsistent.
Universal Resource Locator. Another term for Internet address.
Unshielded Twisted Pair. The most common type of copper telephone wiring. An inexpensive alternative to coaxial cable and fiber-optic cable in small deployments. STP or Shielded Twisted Pair is the same type of wiring, enclosed in a shield that functions as a ground.
Value Added Reseller. Typically an organization that packages standard products with software solutions for a specific industry.
Voice over Internet Protocol. The aggregate protocols and technology of encoding a voice call that allows the call to be transmitted along with data over a network. Such data network may be the Internet or a corporate Intranet.
Virtual Private Network. A network that uses the Internet but has security features limiting access to authorized users.
Wide Area Network. A public network that extends beyond the office or campus.