Products		Technologies		About us		Contact
DSP - technologies for signal processors Telephony modems family DTMF multichannel transivers Parallel radio modems Narrow bandwith Vocoders 1200 - 2400 bit/s) DSP - technologies for programmable devices Telecommunication modules in programmable devices Embedded applications	Telphone modems family  Software for telephone modems implements following ITU standards: • V.21 (300 bit/s, FM modulation, duplex transmission with frequency division) • V.22/V.22bis (600/1200/2400 bit/s, QAM modulation, duplex transmission with frequency division) • V.23 (1200/2400 bit/s, QAM modulation, simplex or duplex transmission (with duble-pair connection) ) • V.23 (600/1200 bit/s, FM modulation, simplex or duplex transmission (with duble-pair connection)) • V.29 (2.4/4.8/9.6 kbit/s, QAM modulation, simplex transmission) • V.32/V.32bis (2.4/4.8/9.6/12.0/14.4 kbit/s, QAM modulation, duplex transmission with echo compensation) • V.33 (2.4/4.8/9.6/12.0/14.4 kbit/s, QAM modulation, simplex or duplex transmission (with duble-pair connection) ) Software for telephone modems is implemented on DSP processors form Texas Instruments (TMS320VC33 family). One processor can handle up to three simultaneous connection in V.32bis mode. In other modes, number of simultaneous connection might be higher. Example application AWP-IŁ Tester     In PM probes , one TMS320VC33 processor handles four phone lines simultaneously. In addition to that, processor also executes measuring functions and algorithms of call establishment (PSTN/ISDN). AWP-IŁ Communication Device AWP-IŁ Communication Device , consist of 30 telephony modems, connected to ISDN network by PRA interface (E1, 2Mbi/s). Modem functions have been implemented using TMS320VC33 signal processors which are connected directly to E1 framer. Microcomputer (based on ARM7) handles ISDN protocols and communication with Test Center (via TCP/IP).