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Network Working Group                                          J. PostelRequest for Comments: 145                                     UCLA - NMCNIC: 6739                                                     4 May 1971Updates:123Obsoletes:127Initial Connection Protocol Control Commands     The following is my interpretation of the exchange between NCP's   which would be necessary to carry out the Initial Connection Protocol   of RFC #123.  (This note corrects an error pointed out by Eric   Harslem of RAND).      Server NCP                      User NCP      __________                      ________      Listen for Connection L         RTS, U, L, l                                                  A      STR, L, U, 32                   ALL, l  , 1, 32                                            A      Send 32 bits of data      in 1 message on link l                            A      (value is S)                    Receive 32 bits of data                                      from link l  (value is S)                                                 A      CLS, L, U                       CLS, U, L      STR, S+1, U+1, B                STR, U+1, S, B                      s                             u      RTS, S, U+1, l                  RTS, U, S+1, l                    B                               C      wait for connection             wait for connection      ALL, l , m , b                  ALL, l , m , b            B   B   B                       C   C   C      data sent to link l             data sent on link l                         C                               B      data received on link           data received on link l                           B                                 CPostel                                                          [Page 1]

RFC 145               Initial Connection Protocol             4 May 1971      l , l , and l , are links, m  and m  are messages allocations, b       A   B       C              B      C                            B      and b  are bit allocations, and all other symbols are defined in           C      RFC #123.      [This RFC is also available in .PS and. PDF format.]          [ This RFC was put into machine readable form for entry ]               [ into the online RFC archives by Lorrie Shiota]Postel                                                          [Page 2]