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- BT announce that ISDN circuits will be ceased
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Data - This is a general term for information sent back and forth over the Internet, whether it’s a web page, an email, music, images or any other type of electronic file.

Data Centre - A data centre (or data center or datacentre) is a facility used to house computer systems and associated components, such as telecommunications and storage systems. It generally includes redundant or backup power supplies, redundant data communications connections, environmental controls (e.g., air conditioning, fire suppression) and security devices.

Data Networks - An electronic communications process that allows for the orderly transmission and receipt of data. A data network is configured to transmit data only and provides transparent, symmetrical and un-contended or contended (5:1) bandwidth between two Ethernet ports in point-to-point, point-to-multipoint or meshed configurations. Many of our ISPs Data networks offer full UK coverage for short, medium and long distance data applications.

Dial-up - Dial-up is a way of connecting to the Internet through a modem. Your computer needs to be connected to a normal phone line and dials your Internet Service Provider (ISP) for access. Every time a connection is needed, the ISP must be called by your computer. The connection also tends to be much slower than broadband Internet, and while connected you cannot use your phone line. See also Broadband

DDI (Direct Dial Inbound) – A feature available on ISDN (see below) switchboards enabling callers to call people directly at their desks. DDI’s are mapped onto specific ISDN lines and the PBX is then programmed to direct the incoming DDI call to the specific extension or hunt group as required. Customers can rent a large volume of DDI’s whilst benefiting from renting an optimum number of lines based on required usage.

DEL - Stands for ‘Direct Exchange Line’

Directory Enquiries Only (DQR) – Upon request, your phone number will not be listed in the BT Phone Book, but is held on Directory Enquiries (118 services).

Download - When you are transferring data from the Internet to your computer, you are downloading. Download speed tends to be measured in Kilobytes per second (Kbps) or Megabytes per second (Mbps). See also uploading.

Download Restriction - Many broadband providers offer packages that place a cap or restriction on the amount of data you can download onto your PC – this helps them regulate how much bandwidth is being used and can therefore charge less for the service e.g. basic business broadband packages. If you should go over the limit, you may be charged for the amount you go over. See also Usage.


EFM - Ethernet in the first mile (EFM), also known as IEEE 802.3ah, is a collection of protocols specified in IEEE 802.3, defining the Ethernet in the access networks, i.e. first or last mile.

With wide, metro and local area networks already standardized, the EFM allows continuous standard Ethernet network across the globe, eliminating non-native transport such as Ethernet over ATM from the access networks.

Email - An email (short for Electronic Mail) is a message, which can be sent almost instantaneously to anyone with an email address, over the Internet.

Ethernet - Ethernet is the most widely used way of sending information from computer to computer at high speed. Unlike an old-fashioned modem, an Ethernet modem doesn’t have to turn the information on your computer into sound to transmit it along phone lines. It is a very common method of networking computers in a LAN (Local Area Network).

Ex Directory - Calls Offered (XDCO) - Not in the BT Phone Book, and not disclosed by Directory Enquiries. The operator will offer to call the customer for persistent enquiries. Please note that this is a chargeable service

Ex Directory - No Calls Offered (XDNC) - Upon request, your phone number will not be listed the BT Phone Book or held on Directory Enquiries.

Exchange - Essentially, an exchange is the building that provides your phone and broadband services in a certain geographical area. Each exchange serves thousands of phone lines, but you may not be eligible for certain broadband packages where you live because, for example, your local exchange has not yet been set up to receive it.

Exchange Line - In the UK we call lines that connect to the network provider exchange lines.

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