Jay Maynard wrote:
On Tue, Sep 06, 2005 at 10:47:36AM -0700, Edward E. Jaffe wrote:
Why has TCP/IP so surpassed SNA?
SNA is/was proprietary while TCP/IP is/was open.
This is half of it. The other half is that SNA is designed for a world where
computing power is concentrated in a few central hosts, while TCP/IP is
designed for a world where everything on the network has some level of
computing power. SNA assumes that the user is sitting in front of a dumb
terminal and wants to use an application on a central machine.
IBM addressed these issues long ago woth HPR/APPN support.
TCP/IP
assumes that one user's terminal may be another's application host.
Same with modern (at least since the late 1980s / early 1990s) SNA.
--
-----------------------------------------------------------------
| Edward E. Jaffe | |
| Mgr, Research & Development | [EMAIL PROTECTED] |
| Phoenix Software International | Tel: (310) 338-0400 x318 |
| 5200 W Century Blvd, Suite 800 | Fax: (310) 338-0801 |
| Los Angeles, CA 90045 | http://www.phoenixsoftware.com |
-----------------------------------------------------------------
----------------------------------------------------------------------
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
