Abstract
The CERN Large Electron Positron (LEP) collider ring under construction and the existing Super Proton Synchrotron (SPS) accelerator will both be operated from the same main control room over a new control network implementing the token-ring protocol in conformity to the IEEE 802.2 and 802.5 standards. To cover the circumference of the LEP and SPS accelerator rings and the long distances (up to 4.6 kms) between geographically distributed control areas an unconventional transmission method has been implemented and successfully tested with the contribution of the IBM Zürich Research Laboratories. The LEP/SPS control network, consisting of several token-rings, inter-connected by bridges, and of gateways to the present SPS multi-star network and to the CERN computer centre, will be described as well as the network reconfiguration and diagnostic facilities.
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