Subject: RE: [SUA issues 3,6,7] text

From: [email-masked]
Date: Tue, 4 Sep 2001 10:33:29 +0300

Hi Brian & Sandeep,

> > Sandeep >> I suggest the term "global title translation" be 
> > changed with "relay node".
> 
> All relay nodes perform GTT.  GTT may be performed more than once at
> an SG which appears to the SS7 network as more than one relay node.
> What constitutes a relay node is poorly defined in SUA (and SCCP for
> that matter).  IMO the GTT statement is clearer.

Agreed,

> > 
> > 
> ==============================================================
> ==========
> > 
> > 3.10.e Sequence Control
> > 
> >    0                   1                   2                   3
> >    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
> >   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >   |         Tag = 0x010e         |             Length = 8         |
> >   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >   |                                               | Seq  Control  |
> >   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> > 
> > Sequence Control (1.1.2/Q.714)
> > 
> > The field is coded with the value of the sequence control parameter
> > associated with a group of messages and are chosen so as to 
> ensure  proper
> > loadsharing of message groups over SLS values while 
> ensuring that sequence
> > control values within message groups have the sequence 
> control value coded
> > with the same value as the initial message of the message group.
> > 
> > 
> > Mandatory in CLDT, CORE, COAK, COIT.
> > 
> > Sandeep >> Above definition of sequence control is very 
> encrypted and it is not
> > clear how SUA recommends this parameter to be used. As this 
> parameter is used
> > for
> > a) Transporting "sequence control" parameter of N-UNITDATA 
> request primitive
> > from SCCP/SUA user to SCCP in a backhaul case
> > b) Something similar to how SCCP uses SLS in RL of incoming 
> SS7 message for
> > maintaining sequence of messages and loadsharing purposes 
> in IPSP (peer to peer)
> > case
> 
> Sequence control is defined by SS7 specifications.  Why not 
> just add the
> text:
> 
>   The use of Sequence Control is defined in Q.711 clause 
> 6.2.2.2.2 Sequence Control.
> 
> There is no need for the proposed text as it duplicates to a 
> large extent the description in Q.711.

Agreed - I have added the text.

John

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