At 750 ms after first receiving the 2225-Hz tone, CTS (clear to send) is taken LOW , and data can be transmitted as well as received. ... Figure 5.20 shows a simplified block diagram for the MCI 45440, including the frequency response curves for the two filters ... The MCI 45440 also includes an extra op-amp, as shown, which can be used for the duplexer circuit. ... 5.4 Modem Circuits and IC Applications 1 03.
|Title||:||Practical digital and data communications-- with LSI applications|
|Author||:||Paul Bates, Paul Bates (P. Eng.)|
|Publisher||:||Reston Pub Co - 1987|