Mike >From a theoretical point of view, SNA can be said to impose a limit of 491 520 bytes in a request unit (RU) since that is the limit of the RU sizes byte in the BIND request, corresponding to X'FF'. However, even this field is only "advisory" and so a larger value could be used.
If you want to indicate that the request units you are sending constitute a larger unit of data at the level of the application, you used the right SNA word to describe the mechanism, namely "chain". There are two bits in the request header which are used to indicate "only in chain", "beginning of chain", middle in chain" and "end of chain" with an obvious pattern of use. You could certainly send any size of data using chaining with LU type 2, whether the RU sizes were 6 x 1024 = 6 144, or any other value equal to or less than 491 520. Note that, in case you were concerned about another possible limitation, the RUs could be segmented over any intermediate data link control medium. I can't tell you what limits you may encounter in CICS or Windows/CS. If you are in charge of the programming behind each of the communicating LUs, just how large the units of data at the level of the application are will be a matter with which your programming will deal. Chris Mason On Wed, 7 Oct 2009 13:35:51 -0500, Ward, Mike S <mw...@ssfcu.org> wrote: >Hello all, I have LANDP talking to windows Communications Server via >LUA. Then Windows/CS talks to mainframe(CICS) via DLUR terminals using >(LU2) protocol. What is the largest record that can be sent from >Windows/CS using LU2 to CICS? Is there some mechanism for chaining very >large records(6K) blocks together? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
