Network Working Group                                          J. Postel
Request for Comments: 145                                     UCLA - NMC
NIC: 6739                                                     4 May 1971
Updates: 123
Obsoletes: 127

              Initial 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                                 C

Postel                                                          [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]