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Network Working Group T. P. Skinner
Request for Comments: 58 MIT Project Mac
June 1970
Logic information synchronization
(RFC 58 - Logical Message Synchronization)
The problem of logic and physical information distinguishing questions are proposed in the last online conference. At that time, if I agreed
Sending two logical information, it also has a problem with one or two physical information. Another solution
Yes: A logic information must begin after a physical information. However, this does not solve find a logical letter
The problem of the end of interest. I suggest a very rare technical issue, it means to use the previous part
Information as a prompt to the post-part physical information of logic information. The release of this technology has produced a lot of effective results.
This happily solving is the specificity of the leading logic information or the particularity of the data type.
use. Even if this program is described very common, many people still like it very much.
Regarding this article, it seems that it is to completely cut the connection between physical information and logic information. From aesthetic point of view
It is of course satisfactory. However, now we have to think of the network as a fact, no
What is physically described bitstream. As long as there is no error on the transmission line, then transfer a logical head and bits for each information.
Number will not be effortless. However, if a bit is lost, then the synchronization problem will be due to such a problem.
- We don't have any other ability to search for the starting point of logical information outside of the blindness, and become more complicated. This
The like error may be caused by unreasonable hosts, users, software / hardware, or IMP itself. This will involve
By bit of information transfer and rationality of data. This may be extremely time consuming like the possibility of introducing error synchronization.
Room.
At this moment I can think of some solutions to solve the problem, but they don't look very well. Due to the invalid synchronization,
A user may send some errors to another host. And this host will go back to the send, and wait
A wrong user continues to send the next message. This will allow the wrong user to puminate from all the waiting inputs.
By coming, then he can affirm the next bit is the beginning of a logical information. The problem here lies in using the network
And the input / output buffer between the two hosts to ensure synchronization. For example, how does the wrong host make him have all
What is the judgment of the unresolved data? Once he is definitely, and suppose all OK, he will continue to enter.
Another solution requires logical constraints, which determines the logical information must always be from physical information.
The boundary is started. Users have to check the starting part of each physical information, see if it meets a logical information letter
Head format. This technology is not only safer than checking the entire input information, but also faster.
I don't have a solution that has already solved this problem, but only a little clue, making it clearer. Such as
If we want to constrain logic information so that it must start from physical information with its decomposition, we must start
There is a plan (in any case, this method is in most cases). Other programs still over a period
Try it again. However, we must be brave to face this problem that will not come.
[This RFC WAS PUT INTO MACHINE READABLE FORM for Entry]
[INTO THE ONLINE RFC Archives by Carl Alexander 7/97]
RFC 58 - Logical Message Synchronization Logic Information Synchronization
1
RFC Document Chinese Translation Program
