NCP survey (RFC0460)
Original Publication Date: 1973-Feb-13
Included in the Prior Art Database: 2001-Nov-15
Internet Society Requests For Comment (RFCs)
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
Network Working Group Chuck S. Kline CSK
Request for Comments: 460 UCLA
NIC 14415 13 February 73
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
Boelter Hall 3804
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
3b1 Code which handles connection establishment including
maintenance of the rendezvous table (table of open and pending
3b2 Code which handles transmission over open connections
including buffer management and the sending of allocate and
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.
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
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 ---- m...