NCP survey
RFC 460

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Network Working Group                                 Chuck S. Kline CSK
Request for Comments: 460                                           UCLA
NIC 14415                                                 13 February 73

                               NCP Survey

   1 This RFC is the first in a series which will request information on
   implementation of host to host protocol.  We would appreciate a reply
   to this RFC from all sites within two weeks.  One convenient way to
   reply is to make a copy of this RFC at the NIC and insert the replies
   at the appropriate spots.  The results of this survey will be
   published.  Please send replies to nic ident CSK or to

   Charles Kline
   Boelter Hall 3804
   UCLA
   405 Hilgard Ave.
   Los Angeles, Cal. 90034

   2 This particular RFC will deal with implementations of Network
   Control Programs (NCPs).  Future RFCs will deal with .
   implementations of Telnet, RJE, etc.

   3 In order to ask questions about NCPs and get meaningful replies, I
   will here describe what I consider to be my concept of an NCP.

      3a An NCP is that part of the system which performs the tasks
      necessary for host to host protocol as specified by document NIC
      7104 (protocols notebook).

      3b NCPs contain the following parts (though not necessarily as
      separate pieces):

         3b1 Code which handles connection establishment including
         maintenance of the rendezvous table (table of open and pending
         connections).

         3b2 Code which handles transmission over open connections
         including buffer management and the sending of allocate and
         giveback commands.

         3b3 Code which handles the actual movement of messages in and
         out of the Imp (sometimes called the Imp handler and sometimes
         in a separate cpu).

         3b4 Other code including measurements, initialization, etc.

Kline                                                           [Page 1]
RFC 460                        NCP Survey                  February 1973

   4. Please answer the following questions.  It is probably appropriate
   to give this survey to the coder of the NCP or other knowledgeable
   person.  Write na (not applicable) where it is appropriate.  Circle
   the number of the appropriate choice when a choice is required.
   Thank you.

   5 General Information

      5a Host Name: ----

      5b Site Number: ----

      5c Your name ----

      5d Main cpu is a ---- (360/75, PDP-10, B6700, etc.)

      5e Operating system in main cpu is ---- (tenex, os/360, etc.)

      5f Is documentation available on your NCP?

         5f1 user level (how to use NCP)

         5f2 system level (implementation)

         5f3 Is the documentation available at the NIC?

   6 Imp interface

      6a built:

         6a1 in house

         6a2 contracted to ----

      6b full or half duplex?

      6c maximum bandwidth is ---- baud in each direction

   7 Coding of NCP

      7a ncp was written:

         7a1 in house

            7a1a written in ---- man-months

            7a1b Name of person who wrote NCP ----

Kline                                                           [Page 2]
RFC 460                        NCP Survey                  February 1973

            7a1c debugged in ---- man-weeks

            7a1d machine hours used in development and debugging of NCP
            ----

         7a2 contracted to ----

            7a2a contractor took ---- man-months

         7a3 supplied another site without modification by this site
         (specify site where NCP obtained from ------).

         7a4 supplied from another site but modified by this site for
         different system or for other reasons (specify site where NCP
         obtained from ------)

            7a4a modifications took ---- man-weeks

      7b NCP is maintained:

         7b1 in house (person's name ----)

         7b2 by another site (specify site ----)

      7c Size of NCP code:

         7c1 Total size of all NCP code (not tables or buffers) as
         described above

            7c1a ---- words of ---- bits per word

         7c2 size of code which initializes NCP (on system up or after
         NCP or NET crash)

            7c2a ---- words of ---- bits per word

         7c3 size of code which handles opening and closing of
         connections

            7c3a ---- words of ---- bits per word

         7c4 size of code which moves data from user process to Imp
         handler or from Imp handler to user process

            7c4a ---- words of ---- bits per word

Kline                                                           [Page 3]
RFC 460                        NCP Survey                  February 1973

         7c5 size of Imp handler code

            7c5a ---- words of ---- bits per word

         7c6 size of other code (explain what it is)

            7c6a ---- words of ---- bits per word

      7d Size of NCP tables: