home *** CD-ROM | disk | FTP | other *** search
-
-
- N-1-3-012.82, "Europe - HEPnet", by Brian Carpenter,
- <brian@dxcern.cern.ch>, and Francois Fluckiger,
- <fluckiger@vxcern.cern.ch>
-
-
- HEPnet is the collection of lines, equipment and services partially or
- totally funded and operated by the European High Energy Physics (HEP)
- community for its 5,000 physicists and their support staff. It
- provides a range of services supported in collaboration by operational
- staff from major HEP institutes. HEPnet in Europe may be compared to
- the US Department of Energy's ESnet, although limited to particle
- physics.
-
- HEPnet was set up in response to very specific requirements of the
- community, such as the need for direct lines of fixed and guaranteed
- high bandwidth between major laboratories and data processing centres,
- or very short network latencies to support advanced distributed
- processing applications. It is thus complementary to HEP use of
- general-purpose research network infrastructure.
-
- The basic infrastructure relies on a set of point to point
- international leased lines between HEP institutes. In several cases,
- these leased lines result from sharing with other European
- initiatives, such as EASInet, the networking component of the IBM
- European Academic Supercomputing Initiative, EARN, EUnet or NORDUnet.
- HEPnet is fully connected via high speed lines to EBONE, the European
- IP backbone.
-
- The international topology is mainly a star around CERN, the European
- Particle Physics Laboratory located on the French-Swiss border near
- Geneva. With lines ranging from 9.6Kbps to 2Mbps it directly connects
- France, Hungary, Germany, Greece (on order), India, Israel, Italy,
- Netherlands, Poland, Russia, Spain (planned), Switzerland, the UK, and
- the USA. The aggregate bandwidth exceeds 12 Mbps, including shared
- lines. Nordic countries are also indirectly connected via NORDUnet.
- National traffic distribution occurs either through the national
- general purpose networks, or through a dedicated HEP network (such as
- in France and Italy).
-
- The leased lines either run native IP, or are multiplexed. TCP/IP,
- DECnet, RSCS and SNA (plus a residual X.25 service) are provided as
- "bearer" services, supporting application services such as distributed
- file and tape management and the World Wide Web (WWW) information
- access system. Monthly HEP traffic is estimated to be 150 Gbytes.
-
- The network is technically managed by the HEPnet Technical Committee
- (HTC) comprising the national HEPnet managers, complemented by a user
- driven group, the HEPnet Requirements Committee (HRC).
-
- Hopes for future evolution include a move to speeds in the range of 34
- Mbps to meet the requirements of new European particle accelerators
- such as the planned Large Hadron Collider (LHC), or the introduction
- of multi-media applications for remote collaborative work. In
- addition, the community has launched a project for shipping physics
- files at 8Mbps over the Olympus satellite of the European Space
- Agency.
-