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Showing papers on "Fast packet switching published in 1972"


Journal ArticleDOI
01 Dec 1972
TL;DR: A processor-controlled packet-store-and-forward data-communication system is described and performance figures are presented.
Abstract: A processor-controlled packet-store-and-forward data-communication system is described and performance figures are presented The philosophy of the system is characterised by the use of a route-search packet to establish the availability of both a route through the network and the destination terminal before the message data is accepted by the network Subsequent message-data packets are constrained to follow the path established by the route search and are maintained in correct sequence by a comprehensive acknowledgment-and-signalling procedure This also provides the facility of error correction by retransmission, and is the basis of a convenient method for the control of buffer storage within the network The exchange implementation comprises a control computer operating in conjunction with link terminal units that are dedicated to the control of the input and output links of the exchange and to packet assembly and checking functions Each of these units consists of a small autonomous microcomputer module controlled by a changeable microprogram They can thus be readily adapted to accommodate the characteristics of the particular links and error-control facilities employed

10 citations


Journal ArticleDOI
TL;DR: The proposed network utilizes synchronous digital transmission with a processor-controlled TDM switching structure and can operate in a conventional circuit switched mode, or operating in a "packet" switched mode.
Abstract: Marketing surveys on data communication have indicated the possible need for a new data service. Technical studies have resulted in a number of detailed proposals for providing a service which, although functionally distinct, is physically integrated with other telecommunications services. The proposed network utilizes synchronous digital transmission with a processor-controlled TDM switching structure. A range of speeds is available. Users' data bytes are structured in "envelopes" to provide an inband control signaling facility. The use of a processor for switch control gives greater flexibility, allows the implementation of sophisticated diagnostics, and, with high-speed interswitch signaling, reduces overall call set-up times. The proposed network is hybrid in that it can operate in a conventional circuit switched mode, or operate in a "packet" switched mode. Extensive multiplexing is used to increase transmission utilization and reduce local area transmission costs.

5 citations


Patent
20 Nov 1972
TL;DR: In this paper, an electronic switching module is provided for a switching system handling signals which have been subjected to Pulse Code Modulation (PCM), which provides a path through two space switching stages to interconnect an incoming channel and an outgoing channel.
Abstract: An electronic switching module is provided for a switching system handling signals which have been subjected to Pulse Code Modulation. The module provides a path through two space switching stages to interconnect an incoming channel and an outgoing channel. A first one of the switching stages responds to an address information signal fed through a receiver register and a buffer register to connect a selected input to a second switching stage. The second switching stage responds to an enable signal to complete a connection through to the selected output line.