Integrated services data switching network
SIGCOMM '79 Proceedings of the sixth symposium on Data communications
Delay related issues in integrated voice and data transmission: A review and some experimental work
SIGCOMM '79 Proceedings of the sixth symposium on Data communications
Sensitivity of integrated voice and data networks to traffic and design variables
SIGCOMM '79 Proceedings of the sixth symposium on Data communications
A network combining packet switching and time division circuit switching in a common system
ACM SIGCOMM Computer Communication Review
The codex 6000 series of intelligent network processors
ACM SIGCOMM Computer Communication Review
TYMNET: a terminal oriented communication network
AFIPS '71 (Spring) Proceedings of the May 18-20, 1971, spring joint computer conference
Speech transmission in packet-switched store-and-forward networks
AFIPS '75 Proceedings of the May 19-22, 1975, national computer conference and exposition
Transmission delay and echo suppression
IEEE Spectrum
On resource sharing in a distributed communication environment
IEEE Communications Magazine
Analysis of voice and low-priority data traffic by means of brisk periods and slack periods
Computer Communications
Standards and protocols: An X.25-compatible protocol for packet voice communications
Computer Communications
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Performance considerations, particularly network delays, for integrated voice and data networks are reviewed. The nature of the delay problem is discussed, followed by a review of concepts, objectives and advances in enhanced circuit, packet and hybrid switching techniques, including fast circuit switching (FCS), virtual circuit switching (VCS), buffered speech interpolation (SI), packetized virtual circuit (PVC), cut-through switching (CTS), composite packets and various frame-management strategies for hybrid switching. In particular, the concept of introducing delay to resolve contention in SI is emphasized and, when applied to both voice talkspurts and data messages, this forms a basis for a relatively new approach to network design called transparent message switching (TMS). This approach and its potential performance advantages are reviewed in terms of various architectural aspects of integrated services networks, such as packet structure, multiplexing scheme, server structure and queuing performance, network topology and network protocols. A number of traffic-management strategies and their grade-of-service implications for voice service are discussed. These strategies include voice call and data session blocking, voice talkspurt and data message buffering, speech loss and data integrity and speech processing techniques, including variable quality, rate, speed and entropy coding. Emphasis is placed on the impact of variable delays on voice traffic, especially the importance of generating and preserving appropriate length speech talkspurts in order to mitigate the effects of variable network delay.