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Janet was previously known as the JNT Association, and prior to that, UKERNA (the United Kingdom Education and Research Networking Association).Janet developed out of a number of local and research networks dating back to the 1970s.There had been some talk of moving Janet to OSI protocols in the 1990s, but changes in the networking world meant this never happened.In January 1991 the JANET IP Service (JIPS) was set up as a pilot project to host IP traffic on the existing network.The network is linked to other European and worldwide NRENs through GEANT and peers extensively with other ISPs at Internet Exchange Points in the UK.The Janet network is operated by Jisc Services Limited, part of Jisc.Super Janet3 created new 155 Mbit/s ATM nodes to fully connect all of the major sites at London, Bristol, Manchester and Leeds, with 34 Mbit/s links to smaller sites around the country. The key challenges for Super Janet4 were the need to increase network capacity and to strengthen the design and management of the JANET network to allow it to meet a similar increase in the size of its userbase.

JANET's mandate now included running metropolitan area networks centred on these sites.By 1980, a number of national computer facilities serving the Science and Engineering Research Council community had developed, each with their own star network (ULCC London, UMRCC Manchester, Rutherford Appleton Laboratory).There were also regional networks centred on Bristol, Edinburgh and Newcastle, where groups of institutions had pooled resources to provide better computing facilities than could be afforded individually.The Janet effort resulted in the standardisation known as the Coloured Book protocols, which provided the first complete X.25 standard.The naming scheme used on Janet (JANET NRS) had similarities to the Internet's Domain Name System, but with domains specified in big-endian format rather than the little-endian style used by DNS.

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