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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]