Jargon buster

Dense Wavelength Division Multiplexing (DWDM) is the technology used to combine multiple fibre networks to create a broader bandwidth for the existing network.

Density Control is when the number of individuals in a designated area must be measured or managed. See also Flow Management and Access Control.

see Direct Internet Access

Digital Access Signalling System (DASS) was BT’s original protocol for providing signalling to ISDN30. DASS is still supported but no longer available for new provides as ISDN30 was superseded by ISDN30e with ETSI or Q931 signalling which is now standard throughout Europe.

Digital Enhanced Cordless Telephony (DECT) is the technology for providing better clarity and smaller phones for cordless handsets (frequently called DECT phones). Mobile Devices are not included in this term.

A Digital Private Network Signalling System (DPNSS) supports connections between telecoms equipment from multiple vendors. See also Q Signalling (QSIG).

A piece of technology which can differentiate between the voice of an individual and background noise to improve the quality of sound. Premier Choice use this term to talk about a “DSP Card” which is a component used in most Panasonic PBX Solutions.

A Digital Subscriber Line (DSL) is used to add broadband with equal bandwidth in both directions to a phone line. The most common DSL line is an ADSL line.

A Digital Subscriber Line Access Multiplexer (DSLAM) is a network distribution device that receives signals from multiple Digital Subscriber Lines (DSL) and connects them into a single high-speed digital communication channel.

Digital Transformation is a buzz-word for the growth companies undergo as a result of introducing and combining innovative technologies.

A Direct Dial Inward (DDI) is an inbound or outbound number assigned to a specific handset and associated to the main CLI. This feature is not available on analogue lines.

A Direct Exchange Line (DEL) is term used for a single analogue line.