Howard
If you are or were ever acquainted with SNA architecture, you will have
heard of the NAU, the generic term for the SSCP, the PU and the LU in
subarea architecture and solely the LU[1] in Low Entry Networking (LEN) and
APPN architecture.
In subarea architecture, NAU stands for "network *addressable* unit". In
LEN/APPN architecture, it undergoes subtle transmogrification to "network
*accessible* unit". I *think* the reason is that, with the "intermediate
session routing" (ISR) mode of routing in LEN/APPN architecture - that is
*not* using HPR - there is address swapping in the intermediate nodes which
is contrary to the intent of the word "addressable" in the subarea version
of NAU.
Chris Mason
[1] Official sources will claim that the CP is a NAU separate from the LU.
On examination, this can be seen to be an unnecessary complication. A CP is
an LU which happens to use certain specific mode names such as CPSVCMG.[2]
Looked at this way, there is no need to keep pointing out to students of LEN
and APPN that the LU used for CP functions may as well be used for the
business sessions instead of going to all the trouble to set up yet one more
set of definitions - to the jeers of the IP bigots.
[2] Careful as always, I Googled to make sure I was talking about the right
mode name and I found the following which is proof of my point:
http://www-1.ibm.com/support/docview.wss?rs=852&context=SSSN3L&dc=DB520&uid=swg21255183&loc=en_US&cs=UTF-8&lang=en&rss=ct852other
----- Original Message -----
From: "Howard Brazee" <[EMAIL PROTECTED]>
Newsgroups: bit.listserv.ibm-main
To: <[email protected]>
Sent: Wednesday, June 06, 2007 8:08 PM
Subject: Re: Friday musings on the future of 3270 applications
On 5 Jun 2007 17:49:48 -0700, in bit.listserv.ibm-main you wrote:
If your cow had wheels she'd be a milk truck. The point is that not
everybody knows what you means, because there are contexts in which
you need to refer to both Unix System Services *and* to Unformatted
System Services; what you get is a guessing game as to whether USS
means Unix whether this time it really means USS.
English has many cases where two words are spelled the same -
sometimes pronounced the same, and sometimes pronounced differently.
Occasionally we have to guess whether the athlete resigned from the
team or resigned with the team, or whether the graduate wants a CD for
his graduation present or a CD for his graduation present.
But usually we can tell which meaning is which.
What is interesting is something which we have seen in our business is
when an acronym starts off with the letters standing for one set of
words, and the words change but not the more familiar acronym.
Sometimes this is to imply a subtle difference in function. I
believe DASD has changed this way. I know there are others.
The word "Unix" itself is an amusing variation from "multix". Hind
site changes why we are amused.
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