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ERIC Number: ED124151
Record Type: Non-Journal
Publication Date: 1972-May
Pages: 27
Abstractor: N/A
Reference Count: N/A
ISBN: N/A
ISSN: N/A
Digital Data Transmission Via CATV.
Stifle, Jack; And Others
A low cost communications network has been designed for use in the PLATO IV computer-assisted instruction system. Over 1,000 remote computer graphic terminals each requiring a 1200 bps channel are to be connected to one centrally located computer. Digital data are distributed to these terminals using standard commercial cable television (CATV) equipment and a PLATO IV network interface unit. The data are transmitted in a synchronous time division multiplexed mode which is compatible with standard television signals. The receiver is contained in the PLATO IV site controller which also houses the circuits for multiplexing information from terminals onto a single voice grade phone line for transmission back to the computer center. The communications cost of this technique is approximately one-tenth of the costs of using a single voice grade telephone line per terminal. (CH)
Publication Type: Reports - Research
Education Level: N/A
Audience: N/A
Language: N/A
Sponsor: N/A
Authoring Institution: Illinois Univ., Urbana. Computer-Based Education Research Lab.