2. System Architecture
The proposed system consists of a server for consultor and
clients to request consultations and the communication
channel using ASDCS. ASDCS uses receive-only satellite
links for data delivery and PSTN modem or N-ISDN for
communication.
The key concept of ASDCS is that little information is
required to request and large information is required to
cany the requested medical information from servers.
The DVB (Digital Video Broadcast) Standard is used as
the data transmission protocol of satellite channel for uplink
and down-link, and TCP/IP is used as Internet packet
protocol of the terrestrial channel. The system architecture
is shown in Fig. 1.