Source : Free On-Line Dictionary of Computing

Datakit
     
         A {circuit-switched} digital network, similar to
        {X.25}.  Datakit supports {host-to-host} connections and
        {EIA-232} connections for {terminals}, {printers}, and {hosts}.
     
        Most of {Bell Laboratories} is {trunk}ed together on Datakit.
        On top of DK transport service, people run {UUCP} for
        {electronic mail} and {dkcu} for {remote login}.
     
        ISN is the version of Datakit supported by {AT&T} Information
        Systems.  Bell Laboratories in Holmdel, New Jersey, uses ISN
        for internal data communication.
     
        {(http://www.fc.net:80/phrack/files/p18/p18-9.html)}.
     
        ["Towards a universal data transport system", A. G. Fraser,
        IEEE Journal on Selected Areas in Communications, SAC-1(5)
        pp. 803-16, 1983].
     
        (1996-10-20)