ADSL – Asymmetrical DigitalSubscriber Line. This is, technology that enables faster datatransmission over copper telephone lines than a conventional voiceband modemcan provide. You can also use these lines for simultaneous voice and datatransmission
Analogue Line – . these are the original lines used formaking telephone calls. It commonly refers to a single line from yourhouse/office to the point at which the line connects to the main telephonenetwork (PSTN). It is cheap and reliable but lacking in features thatbusinesses now take for granted.
Bandwidth – this is the the maximum amount of information (bits/second) that can betransmitted along a channel
Bluetooth – this is a short-range wireless technology designed to allow connectionof portable devices in a wire-free manner.
Broadband – this is the data communications method of sending multiple bits ofdata simultaneously down the same line to give a high throughput or bandwidth.
DECT -Digitally Enhanced CordlessTelephone. DECT is the standard for cordless telephones. DECT phones communicateusing the PSTN (public switched telephone network) through a small base stationin the home or office and have a working radius of between 50 and 300 meters
FCT – Fixed Cellular Terminal. This is a mobile devicethat allows fixed telephony devices such as PBX Telephone Systems to connectdirectly to the GSM Mobile Phone Network – This may be to allow PBX users tocall colleagues on their mobiles free of charge, or call other mobile users atreduced rates (depending upon available tariffs)
ISDN – Integrated Services DigitalNetwork, this refers to an international standard for sending voice, video anddata over telephone wires. ISDN lines are different to standard analogue linesin that they are specifically designed to carry multiple simultaneous voicecalls and data, generally for video conferencing. It is available in two mainderivatives; ISDN 2 and ISDN 30. ISDN benefits over analogue or ordinarytelephone lines in several ways; it dials and connect quicker (1-3 seconds) andsupports multiple telephone numbers per line.
LCR - Least-Cost Routing. This generally refers to the process where an enduser will pay BT for their line rental, but will use a cheaper carrier fortheir calls. The end user would dial a call prefix which tells the localexchange which carrier is being used instead of BT (this can be done call bycall, or more commonly is handled automatically by the office phone system) .
LLU – Local Loop Unbundling. This is the process where communicationsproviders other than BT can take control of individual lines within the BTnetwork. They can then route calls over their own networks. They can also billdirectly for line rental instead of the customer having to receive two bills(one for line rental and one for calls)
PABX – Private Automatic BrancheXchange. This generally refers to a phone system consisting of multiplehandsets and a central automated switchboard. Inbound calls can beautomatically directed to the correct christian dior replica user by number dialled, generally a DDI.Users can dial each other internally by dialling a short ‘extension’ number andthe outside world can be dialled by prefixing a call with a number normally 9or 0
PSTN – Public Switched TelephoneNetwork. This refers to the legacy infrastructure traditionally used to carrymost telephone calls. It includes all the lines and cables from the connectionpoint in your home or office, out of your building to the overhead phone lines,through to localised boxes you see at the end of the road to the local exchangeand onwards nationally and internationally. It started off as an analoguesystem but is now almost completely digital.
Resilience – this is the ability to provide and maintain an acceptable level ofservice in the face of faults and challenges to normal operation
SDSL – Symmetrical Digital SubscriberLine. This is the technology that enables quick transmission of data overstandard telephone lines. It is commonly used as a cost effective method toprovide internet access and company networks across multiple offices. It issymmetric as the download and upload speeds are the same.
SIP – Session InitiationProtocol. This specifically refers to a standard protocol used for initiating andterminating video and voice calls over an IP network. This is an open standardthat the majority of VoIP or Internet Telephony providers adhere to.
VoIP – Voice over Internet Protocol. This is one of the names for thetechnology that uses an IP network, such as the internet, to carry part or allof a phone call. One of the main benefits is that a user can make or receivecalls wherever they can get an Internet connection, plus it offers a fargreater range of functionality and a much cheaper price than traditional PABXstyle systems.
VPN – Virtual Private Network. This isa secure network that is used by companies (and individuals) to communicateconfidentially over public networks such as the internet. Common users of thistechnology are remote/home workers who need to access their company’s centralsystems.
WAN – Wide Area Network. This is a computer network that covers a largegeographic area. This could be a company joining their offices together indifferent cities or the Internet which is world wide.