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Telecommunications Issues for Digital Libraries

Digital libraries will be the access vehicles of the Information Superhighway. The general architecture of the digital library system will be an internetwork of information repositories. Thus one of the major components of the digital library system is the interconnecting telecommu-nication infrastructure. This paper will concentrate on an important telecommunication issue for digital libraries. This concerns the development of appropriate protocols that address the relatively long network latency in a wide area environment. Users of digital libraries will require relatively fast data access, almost to the point where users are unaware of the network delay. This implies that the data delivery time to the user must be 100 milliseconds or less. This paper discusses the merits and demerits of latency reduction approaches currently known. Further, a new scheme is proposed that distinguishes between static and dynamic data and attempts to reduce latency by intelligent caching of data. An advantage of the scheme is that it assumes very loose coupling and control between the caching sites.