Network Working Group
Request for Comments # 127
NIC #5843
[Category D.1
Updates 123]
J. Postel
20 April 71
Computer Science

Comments on RFC 123

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.

     Server NCP                                User NCP
     ----------                                --------
     Listen for Connection on L                RTS, U, L, l
     STR, L, U, 32                                         A
     Send 32 bits of data
     in 1 message on link l
     (value is S)                              Receive 32 bits of data
                                               from link l (value is S)
     CLS, L, U                                 CLS, U, L
     STR, S+1, U, 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 on link l                       data sent on link l
                        c                                         B
     data received on link l                   data received on link l
                            B                                         c

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