Labels:book | hakham | laptop | monitor | plant | road | sky | stairs | windowpane OCR: THE INTERNE 3 1 3 you'd produce if you punched in the ISP's number using a phone keypad. FIGURE 612 The modem then waits for the ISP's modem to answer the call. After the When you transmit data, your ISP's modem answers, the two modems begin to negotiate communica- voiceband modem modulates tions protocols, such as transmission rate The series of beeps, tones, the signal that carries your and whooshing sounds you hear when you connect to your ISP is the data. modem at the other end sound of your modem "talking" to the ISP's modem. This process of nego- of the transmission demodu- tiation sometimes called handshaking. When the negotiation lates the signal complete data transmission can begin (Figure 6-12 Digital signal Analog audio signal Digital signal Your modem changes The receiving mode ...
