Definition and evaluation of the data-link layer of PACnet

Yasser H. Alsafadi; Ralph Martinez; William H. Sanders

doi:10.1117/12.45266

1 July 1991 Definition and evaluation of the data-link layer of PACnet

Yasser H. Alsafadi, Ralph Martinez, William H. Sanders

Proceedings Volume 1446, Medical Imaging V: PACS Design and Evaluation; (1991) https://doi.org/10.1117/12.45266
Event: Medical Imaging '91, 1991, San Jose, CA, United States

Abstract

PACnet is a 200-500 Mbps dual-ring fiber optic network designed to implement a picture archiving and communication system (PACS) in a hospital environment. The network consists of three channels: an image transfer channel, a command and control channel, and a real-time data channel. An initial network interface unit (NIU) design for PACnet consisted of a functional description of the protocols and NIU major components. In order to develop a demonstration prototype, additional definition of protocol algorithms of each channel is necessary. Using the International Standards Organization/Open Systems Interconnection (ISO/OSI) reference model as a guide, the definition of the data link layer is extended. This definition covers interface service specifications for the two constituent sublayers: logical link control (LLC) and medium access control (MAC). Furthermore, it describes procedures for data transfer, mechanisms of error detection and fault recovery. A performance evaluation study was then made to determine how the network performs under various application scenarios. The performance evaluation study was performed using stochastic activity networks, which can formally describe the network behavior. The results of the study demonstrate the feasibility of PACnet as an integrated image, data, and voice network for PACS.

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Yasser H. Alsafadi, Ralph Martinez, and William H. Sanders "Definition and evaluation of the data-link layer of PACnet", Proc. SPIE 1446, Medical Imaging V: PACS Design and Evaluation, (1 July 1991); https://doi.org/10.1117/12.45266

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