Re: Fw: I can not receive sms messages with kannel

On  4 February 2002, Oded Arbel wrote:
> On Mon, 2002-02-04 at 14:14, Paul Keogh wrote:
> > > > > If it is not this then still nothing is wrong, it is the 
> > > nature of 
> > > > > operating without using the SIM memory. If a modem is 
> > > engaged with 
> > > > > transmitting and a receiving SMS is incoming, then I 
> > > believe it lands up 
> > > > > in SIM memory.
> > > > 
> > 
> > Hm. Why do you believe this is the case ? Is it something you've
> > seen with a particular modem/model ? 
> > 
> > I ask because I've done hundreds of loopback tests with Siemens M20s
> > and *never* seen this behaviour - and the purpose of the test was
> > to stress the modem/driver with simulataneous send/receive operations.
> 
> I've seen this happens with M20 too. there are three distinct problems -
> (a) the modem OKs the CNMI command but still sends SMs to memory (very
> rare), (b) the modem start normally, but after some time (maybe under
> load - couldn't reproduce reliably) reverts back to CNMI mode 0 (common
> under some setups, otherwise rare) and (c) under heavy load, when the
> modem simultaniously sends and recieve messages, some messages will land
> in the SIM memory since the TE list is in use for sending messages at
> the time (very common).
> 
> Our solution was to set the CNMI to mode 1, recieve everything we can
> directly, and once in a while to poll the SIM memory for messages - this
> solves an interesting problem which I will expand upon in a minute. the
> down side, is that with this setup, the M20 modem will _always_ (read :
> 100% reproducable) will revert to CNMI mode 0.
> 
> The main problem with Matthew's solution is the short life span of SIM
> memory: using Flash technology, SIM memory cards are limited to 10,000
> writes to each bit of memory. when usage exceeds this bound, the card
> will become useless and inoperatable.

I am skeptical that this is the case. There are people who've used their 
SIM cards for years. Regular handsets operate by saving incoming messages 
to SIM memory. Now these peoples SIM memories still work. Has anyone ever 
experienced this problem with their mobile SIM cards ? Surely 
microchip etching technology has improved since the first SIM cards which 
used to have some warning.

-- 
Matt

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