ITU-T Rec. V.90 (09/98) A digital modem and analogue modem pair
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ITU-T Rec. V.90 (09/98) A digital modem and analogue modem pair
Public Switched Telephone Network (PSTN). Topics in PSTN Introduction review of early exchanges PSTN Standards User services & terminals (discuss today. - ppt download
ITU-T Rec. V.90 (09/98) A digital modem and analogue modem pair
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USB 56K Voice Fax Data External V.90 V.92 Modem With Dual Ports, Compatible With Windows 98SE/2000/ME/XP/Vista/Win 7 and Support Auto-Dial, Tone and Pulse Dialing, Auto Answer, Auto Retrain (Black Color)
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