Cambridge Ring (computer network)
The Cambridge Ring was an experimental local area network architecture developed at the Computer Laboratory, University of Cambridge starting in 1974 and continuing into the 1980s. It was a ring network with a theoretical limit of 255 nodes (though such a large number would have badly affected performance), around which cycled a fixed number of packets. Free packets would be "loaded" with data by a sending machine, marked as received by the destination machine, and "unloaded" on return to the sender; thus in principle, there could be as many simultaneous senders as packets. The network ran over twin twisted-pair cabling (plus a fibre-optic section). There are strong similarities between the Cambridge Ring and an earlier ring network developed at Bell Labs based on a design by John R. Pierce.
The Cambridge Ring was an experimental local area network architecture developed at the Computer Laboratory, University of Cambridge starting in 1974 and continuing into the 1980s. It was a ring network with a theoretical limit of 255 nodes (though such a large number would have badly affected performance), around which cycled a fixed number of packets. Free packets would be "loaded" with data by a sending machine, marked as received by the destination machine, and "unloaded" on return to the sender; thus in principle, there could be as many simultaneous senders as packets. The network ran over twin twisted-pair cabling (plus a fibre-optic section).
There are strong similarities between the Cambridge Ring and an earlier ring network developed at Bell Labs based on a design by John R. Pierce.  That network used T1 lines at bit rate of 1.544 MHz and accommodating 522 bit messages (data plus address).
People associated with the project include Andy Hopper, David Wheeler, Maurice Wilkes, and Roger Needham.In 2002, the Computer Laboratory launched a graduate society called the Cambridge Computer Lab Ring named after the Cambridge Ring.

See also
Cambridge Distributed Computing System
Internet in the United Kingdom § History
JANET
NPL network
Packet switching
Token Ring
University of London Computer Centre

References
External links
Cambridge Ring Hardware
Cambridge Fast Ring
Cambridge Backbone Ring Hardware
Cambridge Computer Lab Ring
"Ring PCB". Relic Archive. University of Cambridge Computer Laboratory. Retrieved 9 April 2011.