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 Local area network - A data communications system that lies within a limited spatial area, has a specific user group, has a specific topology, and (d) is not a public switched telecommunications network, but may be connected to one. LANs are usually restricted to relatively small areas, such as rooms, buildings, ships, and aircraft. A interconnection of LANs within a limited geographical area, such as a military base, is commonly referred to as a campus area network. An interconnection of LANs over a city-wide geographical area is commonly called a metropolitan area network (MAN). An interconnection of LANs over large geographical areas, such as nationwide, is commonly called a wide area network (WAN). LANs are not subject to public telecommunications regulations.
 
  
 link access procedure D - A link protocol used in ISDN.
 
  
 In telecommunications networks and open systems architecture, a group of related functions that are performed in a given level in a hierarchy of groups of related functions. Note: In specifying the functions for a given layer, the assumption is made that the specified functions for the layers below are performed, except for the lowest layer.
 
  
 Logicallink control sublayer - In a local-area-network/metropolitan-area-network (LAN/MAN) system, the part of the link level that supports medium-independent data link functions and uses the services of the medium access control sublayer to provide services to the network layer.
 
  
 Longitudinal redundancy check - A system of error control based on the formation of a block check following preset rules. The block check formation rules are applied in the same manner to each character.