Hello:

I want to use the multiplexer protocol with a mobile module (siemens tc35).
Using the multiplexer protocol you can (for example) make a voice call and
send a sms simultaneously.
The multiplexer mode is entered transmitting AT+CMUX=0. Then you must send a
frame (called sabm) to start the first channel (channel0).
I send this frame: F9 03 3F FC F9 as sabm for channel 0, but the mobile
module does not reply.
Anybody knows something about this?. I mean web pages, news, forums....
Anywhere I can get some information or documentation about multiplexer
protocol to find why it doesn't work.
Any help will be appreciated. Regards,
Carlos

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