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Usage charging for network traffic

Higher Education Institutions (HEIs) are charged for part of the cost of Janet by the Higher Education Funding Council for England and the other regional HE funding councils. Although, originally, the charge to HEIs was on the basis of their transatlantic traffic, the Joint Information Systems Committee (JISC) decided at its meeting on 28 March 2002 that a formula-based model reflecting institutional size, according to HESA annual statistics, should be used.

The University's IT Syndicate (now the Information Strategy and Services Synndicate) agreed in June 2002 that, from 1 August 2002, the Janet networking charge should be recovered by quarterly charges based on all incoming traffic from and outgoing traffic to Janet for the previous quarter. The Computing Service invoices individual Colleges, Schools, and other institutions quarterly in arrears (usually early November, February, May, and August), except that any bill of less than £5 will be carried forward to the next quarter or the end of the financial year. The charge is based on the actual chargeable traffic attributed to the institution during that quarter, scaled so that the total across all institutions is the same as the amount invoiced by Janet(UK), allowing for VAT.

The Janet network charging web page references a Microsoft Excel spreadsheet that shows the charges to HEIs for the AY 1 Aug 2012 to 31 Jul 2013. The charge for the University of Cambridge is £290000.28; this is an increase of 2.1% on the previous year's charge. This charge corresponds to about 5p/GB or about 0.005p/MB based on the amount of network traffic measured between 1 Aug 2011 and 31 Jul 2012.

The traffic that is subject to charging is measured by the Computing Service at the router that connects to Janet.

  • Cambridge Janet traffic accounting data - Recent is an index to web pages showing the breakdown of Janet traffic to/from the CUDN by institution, ordered by total traffic, on a daily, quarterly, and annual basis. The page also links to raw data files to enable institutions to perform their own data processing.
  • Individual web pages per institution giving traffic by individual local computer on a daily basis are available via Cambridge Janet traffic information by host to assist system administrators to manage their usage.

Last updated: August 2012