As per Relevance of the word communication, we have this rfc below:
Network Working Group Bill
Request for Comments: 2
[unknown title
[page 1 missing
1
1a Control
1a1 Logical link 0 will be a control link between any two HOSTs
the
1a1a Only one control link may exist between any two HOSTs
the network. Thus, if there are n HOSTs on the network,
are n-1 control links from each HOST
1a2 It will be primarily used for communication between HOSTs
the purposes of
1a2a Establishing user
1a2b Breaking user
1a2c Passing interrupts regarding the status of links and/
programs using the
1a2d Monitor
1a3 Imps in the network may automatically trace all messages
on link 0.
1b Primary
1b1 A user at a given HOST may have exactly 1 primary link to
of the other HOSTs on the network
1b1a The primary link must be the first link
between a HOST user and another HOST
1b1b Primary links are global to a user, i.e. a user
may open a primary link, and that link remains open until it
specifically closed
Duvall [Page 1]
RFC 2
1b1c The primary link is treated like a teletype connected
a normal data-phone or direct line by the remote HOST, i.e.
remote HOST considers a primary link to be a normal
user
1b1d The primary link is used for passing (user)
information to the remote HOST, e.g. it will be used
logging in to the remote host (using the remote hosts
login procedure).
1c Auxilliary
1c1 A user program may establish any number of auxilliary
between itself and a user program in a connected HOST
1c1a These links may be used for either binary or
transmission
1c1b Auxilliary links are local to the sub-system
establishes them, and therefore are closed when that
is left
2 MANIPULATION OF
2a Control
2a1 The control link is established at system load time
2a2 The status of a control link may be active or
2a2a The status of the control link should reflect
relationship between the HOSTs
2b Primary
2b1 Primary links are established by a user or executive call
the
2b1a The network identification number of the HOST to be
to must be included in the
2b1b An attempt to establish more than one primary link to
particular HOST will be regarded as an error, and the
will be
2b1c Standard Transmission Character
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RFC 2
2b1c1 There will be a standard character set
transmission of data over the primary links and
links
2b1c1a This will be full (8 bit) ASCII
2b1d (get link) The protocol for establishing a link to HOST
from HOST A is as
2b1d1 A selects a currently unused link to HOST B from
allocation
2b1d2 A transmits a link-connect message to B over link 0.
2b1d3 A then waits for
2b1d3a A communication regarding that link from
2b1d3b A certain amount of time to
2b1d4 If a communication regarding the link is received
B, it is examined to see if it is
2b1d4a A verification of the link from B
2b1d4a1 This results in a successful return from
monitor to the requestor. The link number is
to the requestor, and the link is established
2b1d4b A request from B to establish the link.
means: that B is trying to establish the same link as
independently of A
2b1d4b1 If the network ID number of A(Na) is
than that of B(Nb), then A ignores the request,
continues to await confirmation of the link from B
2b1d4b2 If, on the other hand, Na
2b1d4b2a Honors the request from B to establish
link
2b1d4b2b Sends verification as required
2b1d4b2c Aborts its own request, and repeats
allocation process
Duvall [Page 3]
RFC 2
2b1d4c Some other communication from B regarding
link
2b1d4c1 This is an error condition, meaning
either
2b1d4c1a A has faulted by selecting a
allocated link for allocation
2b1d4c1b B is transmitting information over an un
allocated link
2b1d4c1c Or a message regarding allocation from
to A has been garbled in transmission
2b1d4c2 In this case, A's action is to
2b1d4c2a Send a link disconnect message to
concerning the attempted
2b1d4c2b Consider the state of HOST B to be
error and initiate entry to a panic routine(error).
2b1d5 If no communication regarding the link is
from B in the prescribed amount of time, HOST B
considered to be in an error state
2b1d5a A link disconnect message is sent to B from A
2b1d5b A panic routine is called(error).
2c Auxilliary
2c1 Auxilliary links are established by a call to the monitor
a user program
2c1a The request must specify pertinent data about the
link to the
2c1a1 The number of the primary link to B
2c1b The request for an auxilliary link must be made by a
program in each of the HOSTs (A and B).
2c1c If Na > Nb, then HOST A proceeds to establish a link
HOST B in the manner outlined above (getlink).
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RFC 2
2c1d If Na
2c1d1 For HOST B to establish the link (after looking to
if B has already established the corresponding link).
2c1d2 For a specified amount of time to elapse
2c1d2a This means that HOST B did not respond to
request of HOST A
2c1d2b The program in HOST A and B should be able
specifiy the amount of time to wait for the timeout
3 ERROR
3a All messages sent over the network will be error checked
so as to help isolate software and hardware bugs
3b A checksum will be associated with each message, which is
dependent
3b1 The following algorithm is one which might be used
3b1a A checksum of length 1 may be formed by adding
fields in the string to be checked serially, and adding
carry bit into the lowest bit position of the sum
+--------------+
| |
+---FIELD 1----+
ADD +--------------+
| |
+----FIELD 2---+
+-+--------------+
| | |
+-+--------------+
\
\ +--+
ADD CARRY---> | |
+--+
+--------------+
| |
+----RESULT----+
3b1a1 This process is known as folding
Duvall [Page 5]
RFC 2
3b1a2 Several fields may be added and folded in parallel,
they are folded appropiately after the addition
+---------+---------+---------+---------+
| FIELD 4 | FIELD 3 | FIELD 2 | FIELD 1 |
+---------+---------+---------+---------+
+---------+---------+---------+---------+
| FIELD 8 | FIELD 7 | FIELD 6 | FIELD 5 |
+---------+---------+---------+---------+
+-+---------+---------+---------+---------+
| | | | | |
+-+---------+---------+---------+---------+
| | | | |
| | | |
| | | | +---------+
| | | | | |
| | | | +---------+
| | | |
| | | \ +---------+
| | | `-> | |
| | | +---------+
| | |
| | \ +---------+
| | `-----------> | |
| | +---------+
| |
| \ +---------+
| `--------------------->| |
| +---------+
|
\ +---+
`-----CARRY------------------------>| |
+---+
+---------+---------+
| | |
+--CARRY--+---------+
|
\ +-----+
ADD `-----> | |
+-----+
+---------+
| |
+-RESULT--+
Duvall [Page 6]
RFC 2
3b1a2a Using this scheme, it is assumed that, if
are n fields, the carries from the first n-1
are automatically added into the low order position
the next higher field, so that in folding, one
only add the [n] result fields to the carry from
nth field, and then add in an appropiately sized
from that addition (and repeat the desired number
times to achieve the result
3b1a3 A checksum computed in this manner has the
that the word lengths of different machines may each be
optimally
3b1a3a If a string of suitable length is chosen
computing the checksum, and a suitable checksum
length is selected, the checksum technique for each
the machines will be relatively optimal
3b1a3a1 Field length: 288 bits (lowest
denomenator of (24,32,36)
3b1a3a2 Checksum length: 8 bits (convenient field
for all machines
3b1b If a message is divided into groups of fields, and
group is checksummed in this manner, an order
checksum may be got by shifting the checksum for each group
and adding it in (successively) to the checksum of the
3c A facility will be provided where two HOSTs may enter a mode
requires positive verification of all messages. This verification
sent over the control link
4 MONITOR
4a Network I/O
4a1
4a1a Input message from IMP
4a1b Do error checking on message
4a1b1 Verify checksum
4a1b2 Send "message recieved" aknowledgement over
link if aknowledge mode is in effect
Duvall [Page 7]
RFC 2
4a1c (trans)character
4a1c1 There is a strong possibility that the
translation may be done in the IMP
4a1c2 This needs to be explored further with BBN
4a1c3 There are two main
4a1c3a Should the translation be done by table
algorithm
4a1c3a1 Initially it seems as though the best way
go is table
4a1c3b How should we decide which messages should
translated, i.e. is it desirable to not
everything (YES!!) and by what means can we use
differentiate
4a1d Decode header, and pass message to correct recipient
identified by source, and link
4a2
4a2a Build
4a2b Character
4a2b1 See remarks under the section on output
(trans).
4a2c Create
4a2d Check status of
4a2d1 If there has not been a RFNM since the last
transmitted out the link, wait for it
4a2e Transmit message to
4a2f If aknowledge mode is in effect,wait
4a2f1 RFNM from destination IMP
4a2f2 Response from destination HOST over control line 0.
Duvall [Page 8]
RFC 2
4b Network
4b1 Maintain status of other HOSTs on
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
links on an interrupt basis
4b5 Inform other HOSTs as to status of programs using primary
secondary
5 EXECUTIVE
5a Primary
5a1 These require the HOST number as a parameter
5a1a Establish primary
5a1b Connect controlling teletype to primary
5a1c INPUT/OUTPUT over primary
5a1d Interrogate status of primary
5a1d1 Don't know what, exactly, this should do, but it
as though it might be useful
5a1e Disconnect controlling teletype from primary
5a1f Kill primary
5b Auxilliary Links
5b1 Establish auxilliary link
5b1a requires the HOST number as a
5b1b It returns a logical link number which is similar to
file index. It is this number which is passed to all of
other Auxilliary routines as a parameter
5b2 INPUT/OUTPUT over auxilliary
Duvall [Page 9]
RFC 2
5b3 Interrogate status auxilliary link
5b3a Don't know what, exactly, this should do, but it seems
though it might be useful
5b4 Kill auxilliary link
5c Special executive
5c1 Transparent. INPUT/OUTPUT over
5c1a This may be used to do block I/O transfers over a
5c1b The function of the monitor in this instance is
transfer a buffer directly to its
5c1c At does not modify it in any
5c1c1 This means that the header and other
information must be in the buffer
5c1d The indended use of this is for network debugging
6 INITIAL
6a The network will be initially checked out using the links in
simulated data-phone mode
6a1 All messages will be one character in length
6a2 Links will be transparent to the monitor, and controlled
user program via a special executive primitive
6a2a The initial test will be run from two user programs
different HOSTs, e.g. DDT to DDT
6a2b It will be paralleled by a telephone link or similar
[ This RFC was put into machine readable form for entry ]
[ into the online RFC archives by Robbie Bennet 10/1998 ]
[ This RFC was nroffed by Kelly Tardif, Viagenie 10/1999 ]
Duvall [Page 10]
if you see any problems within the linking, don't worry be happy,
this is version 0.1 of the Relevance System and you gotta expect some crappy subroutines sometimes,
just be content we did not write this in Java, which would have made this "bigger and better" HAHAHHA.
RFC documents can be found at I.E.T.F.
Relevance System Copyright © 2002 Spectrum WorldResearch
other technical nosh by ServerMasters Corporation
collaboration of BobX
