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Response to NWG/RFC 346 (RFC0355) Disclosure Number: IPCOM000003544D
Original Publication Date: 1972-Jun-01
Included in the Prior Art Database: 2019-Feb-12
Document File: 3 page(s) / 3K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Davidson: AUTHOR

Related Documents

10.17487/RFC0355: DOI

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 61% of the total text.

Network Working Group John Davidson Request for Comments #355 UH-ALOHA SYSTEM NIC # 10597 9 June 72 Category: Local Echoing, Remote Echoing, Satellite References: RFC 346


John Davidson

June 9, 1972

[Page 1]

Long transmission delays such as those inherent in satellite communication are most certainly a cause for concern among users of remote interactive systems. Since the University of Hawaii will, by the end of this year, be linked to the ARPANET via satellite, the consequences of such delays are perhaps of more immediate concern to us than to current members of the surface net. Consequently the BCC 500 research group here has been studying various solutions to the problems of buffer allocation, partitioned echoing, etc. re-introduced in RFC 346.

Generally, the solutions come from extensions to the original design concepts of the BCC 500 distributed communication system. The 500 was designed to serve a large number of geographically-scattered users each of whom accessed the central computing facility through one of several remote concentrators. [The concept is not too unlike that of users at different TIPs all accessing a single host.] Since it was felt that in full-duplex, character-by-character interaction, echo delays of any noticeable length should not be tolerated, a facility was provide whereby the concentrator could provide local (to the terminal) echoing when deemed appropriate. (A character input/output microprocessor, the CHIO, in implicit conjunction with the terminal user’s process executing in the CPU dictated when it was appropriate.) The problems associated with coordinating the concentrator and CHIO in the partioning of echoing were solved for the BCC 500, but are not immediately extensible to the asynchronous message transmissions of the ARPANET - especially with the introducti...