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Network Working Group                                       Dave WaldenRFC # 449                                                   BBN-NETNIC # 14133                                                 Jan. 6, 1973UpdatesRFC 442              The Current Flow-control Scheme for IMPSYS.    While Vint's notes on IMPSYS flow-control from the March 16, 1972,meeting (RFC 442) seem reasonably accurate and while he does cite ourQuarterly Technical Report #13, he might have done better to cite BBN'stwo formal publications relevant to the IMPSYS flow-control scheme:    1.  McQuillan et al, Improvements in the Design and Performance of        the ARPA Network, Proceedings AFIPS 1972 FJCC, pp. 741-754.    2.  BBN Report 1822, Specifications for the Interconnection of a        Host and an IMP, December 1972 Revision,section 3, pp. 17-35.Reference 2 is particularly important reading for NCP programmers -things have recently changed somewhat.    The inter-IMP acknowledgement mechanism, described in the lastsection of Vint'sRFC 442, is also described in reference 1 and analmost identical mechanism is described inAppendix F of reference 2.The acknowledgement is of only intellectual interest to most Hosts as itis transparent to network users.  However, the description in reference2 is of vital interest to so-called Very Distant Hosts.       [ This RFC was put into machine readable form for entry ]       [ into the online RFC archives by Alex McKenzie with    ]       [ support from GTE, formerly BBN Corp.             9/99 ]Walden                                                          [Page 1]