Glossary of Telecoms Terms

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ADSL (Asymmetric Digital Subscriber Line) this allows a standard phone line to be used as a broadband line for the transmission of large amounts of data.

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Is the rate at which data can be transmitted.


A type of internet connection that allows large amounts of data to be transmitted.

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DDI (Direct Dial Inbound) - this allows individuals or teams within your business to have their own personal number for customers to call - without having to pay for them to have their own personal phone line.


DECT (Digital Enhanced Cordless Technology) - refers to digital wireless telephone technology (cordless phones).

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Commonly used in LAN connections. It is a wired internet connection.

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IP (Internet Protocol) - the transmission of data via the internet.


ISDN (Integrated Services Digital Network) - how voice, video and data are sent over digital phone lines.

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LAN (Local Area Network) - a data network that connects all the computers, printers, scanners, serves, etc within your business.


A traditional phone service with fixed phone lines.

Leased Line:

A leased line is a connection that is used by businesses for internet, data and telephone services. It is a dedicated, high speed connection - meaning you won’t have to share it with anyone else.

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PBX (Private Branch Exchange) - a private phone network used by a business. You can use this network to communicate internally (within your business) and externally (to your customers and suppliers).


PTSN (Public Switched Telephone Network) - this can also be referred to Plain Old Telephone Service (POTS). This allows landline calls to be made.

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SIP (Session Initiation Protocol) - this is how VOIP devices communicate with each other.

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VOIP (Voice Over Internet Protocol) - the transmission of voice data (calls) over the internet. This allows you to make calls without traditional telephone lines.


VPN (Virtual Private Network) - a way of creating a secure private network on a public network.

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WAN / WLAN (Wide Area Network) - a WAN is multiple LANs connected together usually via a broadband connection or leased line.


A wireless internet connection.