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NAS See Network Attached Storage.

National Electrical Manufacturers Association (NEMA) This is a trade organisation in the USA who make a significant contribution to the development of industry standards affecting the imaging community. They also develop and promote new technologies (http://www.nema.org/).

National Health Service Information Authority (NHSIA) This is a special health authority whose remit is to setup a national infrastructure and facilities for information systems in the NHS.

Nearline archive A nearline archive generally comprises storage that is of much higher capacity than the online storage, but is slower. The images on a nearline archive are accessible at any time, however, they do not have the instant access of the online storage, and will typically have an access time of tens of seconds. See Everything Online (EOL), Long Term Archive(LTA), Short Term Storage (STS), Online storage and Offline archive.

Negotiated procedure A procedure where the final product is not definable and is used in the procurement of services and solutions. See Restrictive procedure.

NEMA See National Electrical Manufacturers Association.

Network Attached Storage (NAS) This is a device that contains a number of disk units attached to a dedicated server. The NAS device appears as a server on the network. It is possible to communicate with it using standard file sharing protocols, therefore no specialised hardware is required. See Storage Area Network (SAN).

Network File System (NFS) A file system protocol developed by SUN Microsystems™. It is now a standard protocol in UNIX that allows computers to access each others files. NFS allows files on a remote workstation to appear as part of the local storage.

Network Interface Card (NIC) This is a circuit board that allows a computer to communicate on the network. There are NICs available for all network protocols.

NFS See Network File System.

NHSIA See National Health Service Information Authority.

NIC See Network Interface Card.

Node A node can be a computer or some other device, such as a printer attached to a network. Every node has a unique network address, known as a Media Access Control (MAC) address. See MAC address.

NT This is an abbreviation of the term new technology, and is a multiprocessing operating system produced by Microsoft™. This is most commonly used in office environments.