thanks Chris... once I woke up I got it...
From: Chris Mason <[email protected]> To: [email protected] Date: 07/19/2009 10:41 AM Subject: Re: 3174-1 pack system Sent by: IBM Mainframe Discussion List <[email protected]> Ron Let's try a diagram: PC with TN3270 client <-IP network-> TN3270 server/pre-SNA 3270 controller device <-channel-> z/OS LPAR You will see that the "TN3270 server" is separated from the z/OS LPAR with a channel of some sort. Over this "channel" the TN3270 server and z/OS operate channel programs which function just like those used by pre-SNA (non-SNA) 3270 local controllers, most recently the 3174-L models and originally, in the early '70s, the 3272. Thus the console function of z/OS imagines it is dealing with one of those pre- SNA 3270 controllers. The fact that the device attached at the other end of the channel connection happens to operate a TN3270 server function is of no interest whatsoever to z/OS and makes no demands upon it other than the ability to run channel programs. How loudly can I say this? There is no need for any vestige of the Communications Server IP component - or any UNIX System Services files that the Communications Server IP component may need - in the z/OS system using one of these "TN3270 server/pre-SNA 3270 controller devices" as a console. I hope that is abundantly clear! One of the implementations of the "TN3270 server/pre-SNA 3270 controller device" is the OSA in ICC mode. You can read about this device in the regular manual http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/IOA2M110/ or the redbook http://www.redbooks.ibm.com/abstracts/sg246364.html John McKown and Mark Zelden - he of infinite patience - mentioned some alternatives to the ISA in ICC mode. - Although you didn't mention the need, others have mentioned that, just as it is possible to use a 3270 display device connected with a pre-SNA 3270 controller either as a console or, apparently, in an SNA session, you can use the PC in the diagram above in the same way. The way it works as a device apparently supported by SNA is that VTAM supplies a protocol conversion from pre-SNA channel programs supporting individual devices, displays or printers, logically connected through a pre-SNA controller to a specific 3270 data stream implementation of LU type 0. This protocol conversion is described in Chapter 11. "Programming for the IBM 3270 Information Display System" of the Communications Server SNA Programming manual. - Finally you should be aware that the use of the abbreviation "USS" in the context of TN3270 is ambiguous. At the risk of confusing you, I can mention that, if this query involved the Communications Server IP TN3270 component - which it emphatically does not!, USS would correctly refer to VTAM's Unformatted System Services function as highjacked by the IP component of Communications Server for support of the clients using the Communications Server IP TN3270 server. However, since, as I have said now many times, we are *not* talking about the Communications Server IP TN3270 server, even those "USS files" are not relevant and are not required. Chris Mason On Fri, 17 Jul 2009 15:02:34 -0500, Ron Wells <[email protected]> wrote: >Ah remember (1) pack recovery system... >Looking at an alternative to needing (2) packs-----with TCPIP/OMVS I need >another volume.. >Looking for an alternative to get my 3270-console without the need of >tcpip amd all the uss files needed.. > >any one out there have any ideas... ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- Email Disclaimer This E-mail contains confidential information belonging to the sender, which may be legally privileged information. This information is intended only for the use of the individual or entity addressed above. If you are not the intended recipient, or an employee or agent responsible for delivering it to the intended recipient, you are hereby notified that any disclosure, copying, distribution, or the taking of any action in reliance on the contents of the E-mail or attached files is strictly prohibited. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
