Subject: SG as STP

From: Dennis Niermann <[email-masked]>
Date: Wed, 07 Nov 2001 14:03:59 -0600

I would like to describe what I think is a major influence
on the different expectations concerning IPSP-IPSP.
It is based on how you view M3UA for the SG-ASP case.

M3UA view 1:
M3UA is to MTP3 as M2UA is to MTP2.
I.e., M3UA provides a way to present the 
upper interface of MTP3 (really in the SG) 
to a User Part in a remote IP node.
With this view you could think of the AS's
in the M3UA IP node as the "local users" of 
MTP3 in the SG. 

M3UA view 2:
M3UA view 1 is a very good way to conceptualize the
role of M3UA for the case of a SPMC, i.e. when the
SG acts a signalling end point in the SS7 network.
But, M3UA also supports SGs as STPs. And in the case
of SG as an STP, M3UA view 1 does not apply.
For the STP case, the SG is its own point code and 
various other point codes are used by the ASs.
Thus, the ASs can not be viewed as local users
of the SG MTP3 stack.

Acceptance of the fact that the STP mode for a
SG is allowed and is needed has a very significant
impact on one's perception and viewpoint on the IPSP-IPSP
case.  

-- 
---------------------------------------------------------------
 Dennis Niermann              [email-masked]
 Ericsson Network Systems   
 Richardson, Tx 75081

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