Forums | Agere (Public) | V23 half duplex | Watch |
Author | Topic |
FabB Tl Posts: 5 France | Posted - 3/2/2004 2:36:03 AM Hi, I would like to configure my LT WinModem to communicate with a SMS-Center (fixed line SMS) at V23 half duplex. |
charles Tl Posts: 5879 USA | Posted - 3/2/2004 8:41:19 AM Use +MS=V23 in extra settings. What driver version are you using. http://www.modemsite.com/56k/x2-linklimit.asp#Lucent |
FabB Tl Posts: 5 France | Posted - 3/3/2004 4:37:46 AM I tried AT+MS=V23 but it did'nt work. I think it's because it's half duplex and my modem has to be connected immediatly to receive data transmitted by SMS-Center. |
FabB Tl Posts: 5 France | Posted - 3/3/2004 4:38:20 AM I tried AT+MS=V23 but it did'nt work. I think it's because it's half duplex and my modem has to be connected immediatly to receive data transmitted by SMS-Center. |
v.Richard Tl Posts: 6222 USA | Posted - 3/3/2004 12:49:19 PM http://www.arcelect.com/V23_modem_modulation_Explained.htm The V.23 specification is for a Dial or leased line modem operating at 600/1200 bps over 2 wires in one direction. It has a backward channel of up to 75 bps for error control. The mark space frequencies are close enough that many 202T modems can communicate with V.23 modems. Many times V.23 is mistakenly used to identify a 0/1200 bps modem in applications outside the U.S. V.23 is NOT 1200 bps in both directions. The only time a V.23 modem is needed is to connect to an existing true V.23 modem, Or an application where the same modem type must do both dial and leased line operation. There are very few TRUE V.23 modems.
Then, give modem If not, The half-duplex is only related to the modem-modem link. Your PC->modem via the virtual COM port is irrelevant and will always be 'full-duplex'. Aloha! Richard. Edited by - v.Richard on 3/3/2004 12:51:21 PM |
FabB Tl Posts: 5 France | Posted - 3/4/2004 4:17:37 AM Thanks for your answer, Unfortunately that doesn't work. Here a quick description taken from 'ETSI ES 201 912 V1.1.1' : "Every signalling between the SM-TE and the SM-SC is carried out in the voice band using a bi-directional, half duplex 1 200 Baud FSK modulation. The Physical Layer requirements are described in EN 300 659-2 [7] for the FSK Fabrice |
v.Richard Tl Posts: 6222 USA | Posted - 3/12/2004 9:19:17 AM I don't think the description you've given describes a V.23 call - V.23 provides a uni-directional half-duplex link - your material describes a bi-directional half-duplex link. I don't think there's a modem standard that covers the link you want to do - which would mean you need 'proprietary' modem designed to work with the other end. Aloha! Richard. |
FabB Tl Posts: 5 France | Posted - 3/17/2004 7:27:10 AM DO you know any modem to avoid V25 connection phase ? The lucent modem has the V23 half duplex 1200 bauds mode but, my modem can connect to the SMS Center. The modem has to be connected immediatly after dialing or responding to transmit or receivre an SMS_ESTABLISHMENT frame. Actually, the modem has to be connected immediatly after dialing, is it possible to do that with a lucent modem, or any other modem ? |
zell Tl Posts: 2 Singapore | Posted - 4/28/2004 8:14:10 PM Hi, I'm actually trying to find out whether normal modems can be used to send fixed line sms. Can any one enlighten on that ? |
zell Tl Posts: 2 Singapore | Posted - 4/28/2004 8:14:25 PM Hi, I'm actually trying to find out whether normal modems can be used to send fixed line sms. Can any one enlighten on that ? |
touchring Tl Posts: 2 Singapore | Posted - 5/15/2004 8:48:01 AM Hi Richard, You mentioned proprietary modems, what are the V.23 proprietary modems available and which you would recommend. Is Microsol's DM-16 is good selection? http://www.arcelect.com/V23_Modem-DM16.htm |
sms paul Tl Posts: 1 United Kingdom | Posted - 12/8/2004 10:50:03 AM You may wish to consider a modem designed for landline SMS, you will find what you want at www.z-text.com the AT command set is documented in the technical section Landline SMS via a PC |
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