NarrowbandUsed to describe services or connections with limited bandwidth, characterising certain telecommunication systems, such as switched telephone networks. Narrowband only allows for the transmission of small amounts of information (phone, fax, and low speed data service, among others), in contrast to broadband which enables the transfer of considerable quantities of information.
National Frequency Allocation Plan (NFAP)Spectrum management instrument that consists of the frequency allocation table (radio services assigned to each band), the publication of the allocated and reserved spectrum in the scope of publicly available electronic communications networks and services, as well as the specific cases that require rights of use and the respective process of allocation.
National Numbering PlanRange of numbering or addressing resources administered by ANACOM, organised and defined according to international standards and/or recommendations, that identify subscribers, services, networks or network elements, as well as a set of rules on the format and structure of such resources.
National Regulating Authority (NRA)Body or bodies appointed by a Member State of the European Union to carry out the functions of regulations stated in the community legal framework for electronic communications.
Near Video On Demand (NVOD)Transmission of the same television programmes on various channels but with a small time difference (for example, an hour) between exhibitions on each successive channel to give the client the option of choosing from the different exhibition schedules. It aims to approximate the video-on-demand system, which gives the client total control over the timetable of programme viewing.
Net NeutralityCharacteristic of data networks which give equal priority to all transmissions as they cross the network. The general understanding about it is that it is a principle of non discriminatory behavior by network access operators to any type of application / protocol, where the risk of jeopardizing network resources is normally not considered. This means that all electronic communication passing through the network is treated equally and that the handling of the traffic does not depend on the content of the communication, which service or application that uses the communication or the address of the sender or receiver of the communication. From a consumer perspective, network neutrality is the principle that Internet users should be in control of what content they view and what applications they use on the Internet.
NetworkSet of equipment interconnected by transmission channels so as to enable communication between them to be established.
Network ArchitectureThe way in which a telecommunications network is structured, including, in particular, the various functional levels, interfaces and protocols used to guarantee communication between its different points and ensure the reliable transfer of information.
Network Installation of the SubscriberTelecommunications installation within a private property, which is connected or is to be connected to the public distribution network and composed of collective and individual installations of the subscriber.
Network LineElectric circuit which establishes a direct connection of terminal telecommunications equipment with the corresponding equipment of the telephone exchange.
Network PerformanceCapability of a network or part thereof, to provide communications between users.
Network Routing Number (NRN)Prefix combined to the number dialled by the user, in case of a ported number, enabling the call to be routed to the network to which the number is ported. The NRN has a 3-field structure, as defined in chapter 5 of the Network Technical Interface - Annex I of Portability Specifications.
Network TopologyDescription of the physical configuration and the way in which a network is structures, such as ring, star, tree and others.
Next generation networkTerm which refers, simultaneously, to the integration of current different types of networks and services into a single concept, allowing lower costs in terms of operation and maintenance, as well as the convergence of services. With respect to the access network, the term is commonly used to describe the total or partial substitution of copper on the local loops by fibre-optic. This allows a five-fold increase in speed.
NGA - Next Generation Access NetworksEvolution of access networks for the provision of advanced electronic communication services, including the provision of a high level of band width to final customers. This evolution, independent of the technologies and topologies of the networks involved, is essentially characterised by the roll out of fibre optic as far as up to the home of the final customer- FTTH: Fibre To The Home.
NNA WG - Numbering, Naming and Addressing Working GroupWorking group of the Electronic Communications Committee (ECC) on Numbering, Naming and Addressing.
Non-geographic numberA number from the national numbering plan that is not a geographic number, including in particular mobile, freephone and premium rate numbers.
Non-ionising radiationIncludes all types of electromagnetic spectrum radiation and fields which do not normally have enough energy to cause ionisation. These types of radiation are characterised by the fact that the amount of energy per photon is less than around 12 eV, by wavelengths exceeding 100nm and frequencies below 3x1015 Hz.
NRA - National Regulating AuthorityBody or bodies appointed by a Member State of the European Union to carry out the functions of regulations stated in the community legal framework for electronic communications.
NRN - Network Routing NumberPrefix combined to the number dialled by the user, in case of a ported number, enabling the call to be routed to the network to which the number is ported. The NRN has a 3-field structure, as defined in chapter 5 of the Network Technical Interface - Annex I of Portability Specifications.
NumberA series of digits that indicate a termination point of an electronic communication network, comprising the necessary information for routing calls to that termination point.
Number MobilityAbility of a client to keep their geographic telephone number when changing their address.
Number PortabilityAbility of a client who transfers from one operator to another to retain the same number, provided there is no change of address.
Numbering, Naming and Addressing Working Group (NNA WG)Working group of the Electronic Communications Committee (ECC) on Numbering, Naming and Addressing.
NVOD - Near Video On DemandTransmission of the same television programmes on various channels but with a small time difference (for example, an hour) between exhibitions on each successive channel to give the client the option of choosing from the different exhibition schedules. It aims to approximate the video-on-demand system, which gives the client total control over the timetable of programme viewing.