/                                                      \
        |     +-----------+                    +-----------+    |
        |     |           |                    |           |    |
        |     |           |                    |           |    |
        |     | terminal  |                    | terminal  |    |
        |     |           |                    |           |    |
        |     |           |                    |           |    |
        |     +-----+-----+                    +-----+-----+    |
        |           |                                |          |
        |           |                                |          |
        |           |                                |          |
        |     +-----+-----+                    +-----------+    |
        |     |     |     | Request connection |     |     |    |
   UCLA {     |     |     | -> over link 25    |     |     |    } SRI
        |     |   +-+-+   |  +-+          +-+  |   +-+-+   |    |
        |     |   | OS|---+-=|I|----------|I|=-+---| OS|   |    |
        |     |   +-+-+   |  +-+          +-+  |   +---+   |    |
        |     |           |                    |           |    |
        |     |           |                    |           |    |
        |     +-----------+                    +-----------+    |
        |      HOST: UCLA                        HOST: SRI      |
         \                                                     /



























 
RFC 1                        Host Software                 7 April 1969


b.  After Link Establishment and Log-in


         /                                                      \
        |     +-----------+                    +-----------+    |
        |     |           |                    |           |    |
        |     |           |                    |           |    |
        |     | terminal  |                    | terminal  |    |
        |     |           |                    |           |    |
        |     |           |                    |           |    |
        |     +-----+-----+                    +-----+-----+    |
        |           |                                |          |
        |           |                                |          |
        |           |                                |          |
        |     +-----+-----+ "Please send front"+-----------+    |
        |     |     |     | end control"       |     |     |    |
   UCLA {     |     |     |        ->          |     |     |    } SRI ___
        |     |   +-+-+   |  +-+          +-+  |  +--+---+ |    |    /   |
        |     |   | OS|---+-=|I|----------|I|=-+--|OS|NLS| +----+---|    |
        |     |   +-+-+   |  +-+          +-+  |  +------+ |    |   |___/
        |     |           |       DEL prog.    |           |    |   |    |
        |     |           |        <-          |           |    |   |____|
        |     +-----------+                    +-----------+    |
        |      HOST: UCLA                        HOST:SRI       |
         \                                                     /