2b1a The network identification number of the HOST to be linked
         to must be included in the call

         2b1b An attempt to establish more than one primary link to a
         particular HOST will be regarded as an error, and the request
         will be defaulted

         2b1c Standard Transmission Character Set






 
RFC 2


            2b1c1 There will be a standard character set for
            transmission of data over the primary links and control
            links.

               2b1c1a This will be full (8 bit) ASCII.

         2b1d (get link) The protocol for establishing a link to HOST B
         from HOST A is as follows

            2b1d1 A selects a currently unused link to HOST B from its
            allocation tables

            2b1d2 A transmits a link-connect message to B over link 0.

            2b1d3 A then waits for:

               2b1d3a A communication regarding that link from B

               2b1d3b A certain amount of time to elaspse

            2b1d4 If a communication regarding the link is received from
            B, it is examined to see if it is:

               2b1d4a A verification of the link from B.

                  2b1d4a1 This results in a successful return from the
                  monitor to the requestor. The link number is returned
                  to the requestor, and the link is established.

               2b1d4b A request from B to establish the link. This
               means: that B is trying to establish the same link as A
               independently of A.

                  2b1d4b1 If the network ID number of A(Na) is greater
                  than that of B(Nb), then A ignores the request, and
                  continues to await confirmation of the link from B.

                  2b1d4b2 If, on the other hand, Na<Nb, A:

                     2b1d4b2a Honors the request from B to establish the
                     link,

                     2b1d4b2b Sends verification as required,

                     2b1d4b2c Aborts its own request, and repeats the
                     allocation process.






 
RFC 2


               2b1d4c Some other communication from B regarding the
               link.

                  2b1d4c1 This is an error condition, meaning that
                  either:

                     2b1d4c1a A has faulted by selecting a previously
                     allocated link for allocation,

                     2b1d4c1b B is transmitting information over an un-
                     allocated link,

                     2b1d4c1c Or a message regarding allocation from B
                     to A has been garbled in transmission.

                  2b1d4c2 In this case, A's action is to:

                     2b1d4c2a Send a link disconnect message to B
                     concerning the attempted connection

                     2b1d4c2b Consider the state of HOST B to be in
                     error and initiate entry to a panic routine(error).

               2b1d5 If no communication regarding the link is received
               from B in the prescribed amount of time, HOST B is
               considered to be in an error state.