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3g



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Topic # 6866 1-Mar-2006 04:00
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I'm trying to get a C1 Compact Flash GSM/GPRS card (aka Audiovox RTM8000, Siemens Connect2Air etc.etc.) working with our ruggedised Pocket PC and having absolutely no luck. Note that we are trying to get it to work in GSM mode (ie modem to modem), not GPRS mode.

Maybe someone out there (who has had the pleasure in the past of working out what obscure init string is necessary to get a modem going) can help me in the this case.

The problem:
I'm using an init string of ATQ0V1S7=120X4.
When the modems connect, I never get back "CONNECT" - I get nothing.
Our software waits for the connect, thus timesout because it never comes (despite the modems having connected).

Background Info:
- The card works perfectly in GPRS mode
- After logging the traffic for the GPRS connection, I can see that a CONNECT message comes back in that case (ie it works perfectly in GPRS mode)
- Other modems connect and work perfectly with the system

Any suggestions will be gratefully received 8-).

Nigel H.

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BDFL - Memuneh
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Reply # 29552 1-Mar-2006 07:41
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When you say "other modems" are there on a cellular network? If not, you are trying to establish a CSD (Circuit Switched Data) connection, and not all operators provide this anymore. Some simply say "use packet data" (GPRS, EDGE, UMTS) instead. You will have to contact your mobile operator first to see if CSD is possible with your account.





3g



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  Reply # 29601 1-Mar-2006 18:22
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Thanks for the reply Mauricio.

When I say "other modems", I mean other mobile devices.
eg if I grab a T39 (my old faithful), a V800 or Nokia 6310i with exactly the same SIM card, they all connect as expected, with no init strings, and dialling from what is effectively a comms application (ie MS Dial-Up Networking isn't doing anything special for me in the background).

I think it might be a limitation of the card. I know that it doesn't support a lot of common AT commands which leads me to believe that it was "engineered until it worked" versus "engineered to work". Since most people would be focussed on using it in GPRS mode, then that is where they would have done most of their testing.

Kind Regards,

Nigel H

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