connection.  The connection
                                       will be established, provided:
                                       1.  SRI is willing to accept
                                       another foreign user;
                                       2.  The UTAH user is cleared
                                       for network access at UTAH.
                                       This is determined by a
                                       status word kept in the PDP-10
                                       monitor for each user.





 
RFC 15          Network Subsystem for Time Sharing Hosts  September 1969


   @LOGIN CARR.                        The user logs in SRI.
    --    -----

   Characters typed on the user's teletype are transmitted unaltered
   through the PDP-10 (user Host) and on to the 940 (serving HOST.)
   (The exception to this is a possible one-for-one code conversion
   required between the UCLA Sigma 7 and the PDP-10, for example).

   @CAL.                               The PDP-10 TELNET subsystem
    -  -                               switches to full duplex,
                                       character-by-character
                                       transmission, since this is
                                       required by 940's.  Characters
                                       typed by the user are
                                       underlined. Full duplex
                                       operation is allowed for by
                                       the PDP-10, though not used
                                       by most DEC subsystems.

   The user wishes to load a CAL file into 940 CAL from the file system
   on his local PDP-10.

   CAL AT YOUR SERVICE
   >READ FILE FROM NETWRK.             'NETWRK' is a predefined
    ----------------------             940 name similar to PAPER
                                       TAPE OR TELETYPE.  The 940
                                       file opening BRS is set to
                                       expect an auxiliary connection
                                       and the file from UTAH.

   #NETWRK: <- DSK:MYFILE.CAL      The user types the prescribed
    -----------------------------      escape character, followed by
                                       the TELNET command, to send
                                       the desired file to SRI on an
                                       auxiliary connection.  The
                                       user's next statement is in
                                       CAL again.

The Telnet Subsystem

   The Telnet subsystem coding should fit easily into one core page, for
   it does very little.  It effectively establishes a shunt in the user
   HOST between the remote user and the serving HOST.  Telnet commands
   are:








 
RFC 15          Network Subsystem for Time Sharing Hosts  September 1969


   ESCAPE CHAR IS ___________      Declares a character which
                                       Telnet will watch for.
                                       Subsequent strings typed
                                       between this character and
                                       a carriage return are not
                                       shunted through to the serving
                                       host, but sent instead to the
                                       Telnet program in the user's
                                       local HOST.

   This escape character is not the same as the user's host
   rubout character.

   CONNECT TO __________________   The official site name of the
                                       desired serving HOST is typed
                                       (i.e.: SRI, UTAH, UCLA, UCSB).
                                       Telnet attempts to establish a
                                       connection.  If the attempt is
                                       successful, the following
                                       characters are shunted through
                                       the user's local machine.  The
                                       connection places the user in
                                       the pre-logged in state at
                                       the serving HOST.

   LOGOUT                          Telnet issues the logout command