Speech transmission in packet-switched store-and-forward networks

  • Authors:
  • James W. Forgie

  • Affiliations:
  • M.I.T. Lincoln Laboratory, Lexington, Massachusetts

  • Venue:
  • AFIPS '75 Proceedings of the May 19-22, 1975, national computer conference and exposition
  • Year:
  • 1975

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Abstract

The past few years have seen a widespread and growing application of packet-switched store-and-forward networks for data communication between geographically separated computer installations. Such networks can provide connections between facilities with the many desirable properties of dedicated communication lines but at reduced costs which result from the time-sharing of the actual lines among many customers. Barring the failure of local terminal equipment, such a network provides connections among its customers which implicitly exist regardless of the load being placed on the network. However, the network characteristics seen by an individual customer will vary with overall network traffic, since the network will tend to deliver messages less frequently and with increased delay (possibly beyond the point of usefulness) as load increases. This property of packet-switched networks---guaranteed connections with variable throughput and delay---is just the reverse of that exhibited by circuit-switched networks such as the telephone system. When circuit-switched systems are heavily loaded, delay may be experienced in making a connection, but once it is established, its throughput and delay will not vary with other system activity.