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KMID : 0372919930140040315
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Journal of Biomedical Engineering Research
1993 Volume.14 No. 4 p.315 ~ p.320
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A Study on the Implementation of ISDN LAPD Protocol for the Ultrasonic Image Transfer
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정용길/Chung YK
한민수/임용곤/나상신/김영길/고형화/안영복/Han MS/Lim YK/Na SS/Kim YK/Kho YH/Ahn YB
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Abstract
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This paper deals with a subject for implementation of L+ayer 1 and Layer 2(LAPD) of ISDN user-network interface on the basis of CCITT recommandation J.411, J.412, J.441 (Q.921), I.450(Q.930) and I.451(Q.931) for ultrasonic :image transfer. For the implementation of LAPD protocol of ISDN in this study. PC-CARD based hardware(TA:Terminal Adopt) is proposed and operating system (PC-XINU) supporting the Multiprocessing is transplanted to it. As the Service Access Point(SAP) is accessed by using the port of XINU and Layers which consist of transmitting and receiving part are independantly processed for each other in this proposed system. It can be easy and flexible to implement LAPD protocol for the message transfer.
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KEYWORD
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