4a1c1 There is a strong possibility that the character
            translation may be done in the IMP.

            4a1c2 This needs to be explored further with BBN.

            4a1c3 There are two main considerations

               4a1c3a Should the translation be done by table or
               algorithm?

                  4a1c3a1 Initially it seems as though the best way to
                  go is table.

               4a1c3b How should we decide which messages should be
               translated, i.e. is it desirable to not translate
               everything (YES!!) and by what means can we use to
               differentiate?

         4a1d Decode header, and pass message to correct recipient as
         identified by source, and link.

      4a2 Output

         4a2a Build header

         4a2b Character translation

            4a2b1 See remarks under the section on output translation
            (trans).

         4a2c Create checksum

         4a2d Check status of link

            4a2d1 If there has not been a RFNM since the last message
            transmitted out the link, wait for it.

         4a2e Transmit message to IMP

         4a2f If aknowledge mode is in effect,wait for

            4a2f1 RFNM from destination IMP.

            4a2f2 Response from destination HOST over control line 0.






 
RFC 2


   4b Network status

      4b1 Maintain status of other HOSTs on network

         4b1a If an IMP is down, then his HOST is considered to be down.

      4b2 Maintain status of control lines.

      4b3 Answer status queries from other HOSTs.

      4b4 Inform other HOSTs as to status of primary and auxilliary
      links on an interrupt basis.

      4b5 Inform other HOSTs as to status of programs using primary and
      secondary links

5 EXECUTIVE PRIMITIVES

   5a Primary Links

      5a1 These require the HOST number as a parameter.

         5a1a Establish primary link

         5a1b Connect controlling teletype to primary link

         5a1c INPUT/OUTPUT over primary link

         5a1d Interrogate status of primary link

            5a1d1 Don't know what, exactly, this should do, but it seems
            as though it might be useful.

         5a1e Disconnect controlling teletype from primary link

         5a1f Kill primary link

   5b Auxilliary Links.

      5b1 Establish auxilliary link.

         5b1a requires the HOST number as a parameter

         5b1b It returns a logical link number which is similar to a
         file index. It is this number which is passed to all of the
         other Auxilliary routines as a parameter.