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Janet logo.png
Mottothe UK's research and education network
PredecessorSERCnet [1]
Formation1 April 1984
Type National research and education network
PurposeTo manage the operation and development of the UK's national education and research network
Headquarters Harwell, Oxfordshire, United Kingdom
Region served
Director (Jisc Technologies)
Tim Kidd
Website www.ja.net/janet
Formerly called
Janet(UK); JANET

Janet is a high-speed network for the UK research and education community provided by Jisc, a not-for-profit company set up to provide computing support for education. [2] It serves 18 million users and is the busiest National Research and Education Network in Europe by volume of data carried. [3] JANET was previously a private, UK government-funded organisation, which provided the Janet computer network and related collaborative services to UK research and education.


All further- and higher-education organisations in the UK are connected to the Janet network, as are all the Research Councils; the majority of these sites are connected via 20 metropolitan area networks across the UK (though Janet refers to these as regions, emphasising that Janet connections are not just confined to a metropolitan area [4] ). The network also carries traffic between schools within the UK, although many of the schools' networks maintain their own general Internet connectivity. The name was originally a contraction of Joint Academic NETwork but it is now known as Janet in its own right.

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. [5] Any other networks are reached via transit services from commercial ISPs using Janet's Peering Policy. [6]

The Janet network is operated by Jisc Services Limited, part of Jisc. Janet is also responsible for the .ac.uk and .gov.uk domains. On 1 December 2012, Janet and Jisc Collections joined together to form Jisc Collections and Janet Limited, as subsidiary organisations to Jisc. In March 2015, [7] Jisc Collections and Janet Limited was renamed to Jisc Services Limited. Jisc Services continues to operate under the brand name of Janet, with the same remit. Janet was previously known as the JNT Association, and prior to that, UKERNA (the United Kingdom Education and Research Networking Association).


Early academic networks

Janet developed out of a number of local and research networks dating back to the early 1970s. 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 (NUMAC - the Northern Universities Multiple Access Computer [8] ), where groups of institutions had pooled resources to provide better computing facilities than could be afforded individually. These networks were each based on one manufacturer's standards and were mutually incompatible and overlapping. [9] [10]


In the early 1980s a standardisation and interconnection effort started, hosted on an expansion of the SERCnet X.25 research network. [11] The system first went live on 1 April 1984, [2] hosting about 50 sites with line speeds of 9.6  kbit/s. In the mid-80s the backbone was upgraded to a 2  Mbit/s backbone with 64 kbit/s access links, and a further upgrade in the early 1990s sped the backbone to 8 Mbit/s and the access links to 2 Mbit/s, making Janet the fastest X.25 network in the world.

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. There had been some talk of moving Janet to OSI protocols in the 1990s, but changes in the networking world meant this never happened. [11] [12] [13] [14] [15]

JIPS and SuperJanet

Planning began in January 1991 for the JANET IP Service (JIPS). [16] It was set up as a pilot project in March 1991 to host IP traffic on the existing network. [17] Within eight months the IP traffic had exceeded the levels of X.25 traffic, and the IP support became official in November. The X.25 service was closed in August 1997. [18] Today Janet is primarily a high-speed IP network.

In order to address speed concerns, several hardware upgrades have been incorporated into the Janet system. In 1989 SuperJanet was proposed, to re-host JANET on a fibre optic network. Work started in late 1992, and by late 1993 the first 14 sites had migrated to the new 34 Mbit/s ATM system. SuperJanet also moved solely to IP. [19]

In 1995 SuperJanet2 started, adding 155 Mbit/s ATM backbones and a 10 Mbit/s SMDS network encompassing some of the original JANET nodes. JANET's mandate now included running metropolitan area networks centred on these sites.

SuperJanet3 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.

In March 2001 SuperJanet4 was launched. The key challenges for SuperJanet4 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.

SuperJanet4 saw the implementation of a 2.5 Gbit/s core backbone from which connections to regional network points of presence were made at speeds ranging between 155 Mbit/s to 2.5 Gbit/s depending upon the size of the regional network. In 2002 the core SuperJanet4 backbone was upgraded to 10 Gbit/s.

SuperJanet4 also saw an increase in the userbase of the JANET network, with the inclusion of the Further Education Community and the use of the SuperJanet4 backbone to interconnect schools' networks. The core point of presence (Backbone) sites in SuperJanet4 were Edinburgh, Glasgow, Warrington, Reading, Bristol, Portsmouth, London and Leeds.

In October 2006 the SuperJanet5 project was launched after £29 million of investment. It provides a 10 Gbit/s backbone, with an upgrade path to 40 Gbit/s over the next few years. The new backbone as a result of the SuperJanet5 project is a hybrid network offering, providing both a high speed IP transit service and private bandwidth channel services provisioned over a dedicated fibre network. It is designed not only to fully accommodate the requirements of the traditional JANET user base - all research institutes, universities and further education - but also to meet the needs of a new userbase in the UK's primary and secondary schools.

In April 2011 Verizon helped Janet upgrade 4 central locations to run at 100 Gbit/s bringing it to a national research and education network performance parity with Internet2 (which upgraded its backbone to 100 Gbit/s in October 2007). As of October 2011 they have over 18 million end-users. [20]

Janet6 started to go live in July 2013, [21] and was officially launched at an event at the London Film Museum on 26 November 2013. [22] At launch, Janet6 had an initial capacity of 2 Tbit/s. [23]


The Janet network is implemented through 18 regions which connect universities, colleges and schools to the Janet network. Most regions are operated by Janet, although a few operate as independent entities working under contract.

Each regional network covers a specific geographical area. As of 2014 the following regional networks are connected to Janet: [4]

See also

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  2. 1 2 "1984-2014: 30 years of the Janet network" (PDF). Disc. Retrieved 23 September 2017.
  3. "Janet Network". Jisc. Retrieved 24 September 2017.
  4. 1 2 Regional Delivery Options
  5. Peering Networks Detailed View
  6. Janet Peering Policy
  7. Companies House
  8. History of Computing http://www.computinghistory.org.uk/det/43344/Northumbrian-Universities-Multiple-Access-Computer-The-NUMAC-Data-Entry-System/.Missing or empty |title= (help)
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  11. 1 2 Wells, Mike (1 November 1988). "JANET-the United Kingdom Joint Academic Network". Serials. 1 (3): 28–36. doi: 10.1629/010328 . ISSN   1475-3308.
  12. Earnshaw, Rae; Vince, John (20 September 2007). Digital Convergence - Libraries of the Future. Springer Science & Business Media. p. 46. ISBN   978-1-84628-903-3.
  13. Mansell, Robin; Mansell, Dixons Chair in New Media and the Internet Interdepartmental Programme in Media and Communications Robin (2002). Inside the Communication Revolution: Evolving Patterns of Social and Technical Interaction. Oxford University Press. p. 208. ISBN   978-0-19-829656-0.
  14. Reid, Jim (3 April 2007). "The Good Old Days: Networking in UK Academia ~25 Years Ago" (PDF). UKNOF7. Manchester. Retrieved 16 April 2008.
  15. "6th UK Network Operators' Forum Meeting Agenda". www.uknof.org.uk. Retrieved 12 February 2020. See "15:00 Starting the Commercial Internet in the UK (Peter Houlder)"
  16. "FLAGSHIP". Central Computing Department Newsletter (12). January 1991.
  17. "FLAGSHIP". Central Computing Department Newsletter (16). September 1991.
  18. "Janet(UK) Quarterly Report to the Janet Community: July 1997 to September 1997". Janet webarchive. 1997. Archived from the original on 16 February 2012.
  19. Cooper, Bob (1990). From Janet to SuperJanet: The Development of a High Performance Network to Support UK Higher Education and Research. The Computer Board for Universities and Research Councils.
  20. "About Janet". Janet. Retrieved 8 October 2011.
  21. "Janet6 Migration Timetable" (PDF). Janet. Retrieved 20 September 2013.
  22. "Janet6 Launch". Janet. Retrieved 20 September 2013.
  23. "Janet6 Brochure and Diagram" (PDF). Janet. Retrieved 20 September 2013.