Re: cant connect using at commands


what _exactly_ i am trying to do is implementing this "ETSI ES 201 912"
standard.
it is " Short Message Communication between a fixed network Short
Message Terminal equipment and a Short Message Service Centre "

http://webapp.etsi.org/exchangefolder/es_201912v010201p.pdf


the physical layer of the protocol2 defined in this document reffers to
another standard

http://webapp.etsi.org/exchangefolder/en_30065901v010301p.pdf

"ETSI EN 300 659" which tells


"Simplex asynchronous voiceband data transmission technique is used to
transfer data to the TE. A frequency modulator is required in the LE
and a demodulator in the TE. The frequency modulator shall meet 1 200
baud V.23 [6] standard characteristics as specified in ITU-T
Recommendation V.23 [6] for the forward data transmission channel"

so its asynchornous. one start bit, 8 data bits and one stop bit. but i
dont understand why do you say that a steady tone of some frequency
should be heard ?

when i dial the telephone from some other phone, and when the telephone
is expecting the SMS (rather then an ordinary call), a small beep is
heard. which i know is the fist fsk frame that that telephone was
supposed to transmitt, which consists of 300 alternating mark and space
bits followed by 80 mark bits. after transimtting this the telephone
waits for the SMS .. and when it is not transmitted within a defined
time, it transmitts another signal (which represents error) and hangs
up.

now is there any meathod to capture these bits ? when there is no
CONNECT or CON or something...


thanks for your help

Somia

.

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