D

Direct Internet Access

Any standalone internet circuit not part of a wider joint network.

Direct Station Selector

A Direct Station Selector (DSS) is a unit that sits alongside a telephone enabling the handset to be used a reception/switchboard console. The unit provides programmable buttons enabling the operator to quickly dial and see the status of user extensions.

Disaster Recovery

Disaster Recovery (DR) is the continuity plan put in place for when there is a power failure or fault with the telecoms solution.

Distribution Point

The final point within a network where the cable or fibre terminates, typically the street (telegraph pole), cabinet or premises.

DNS

see Domain Name System

Domain

This is the address of a particular website, for example www.premierchoicegroup.com is a domain name. 

Domain Name System

A centralised system which categorises multiple network locations with a label (e.g. a domain). To save entering the full network address (possibly in numeric form) a simple domain label can attributed (e.g. google.com).

DOS

see Denial of Service

Downstream

Receiving information on to your computer from another source – e.g. the internet. 

Downtime

The total time a system is out of service. 

DP

see Distribution Point

DPNSS

see Digital Private Network Signalling System

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