| FIGURE 4 |
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| The Multipoint Broadband Access family of chips from AT&T Microelectronics handles ATM-based SDV data transmission in both the optical network unit and the set-top box. The chip set uses 16 CAP modulation to support a 51.84-Mbps signal downstream channel and QPSK modulation to support a 1.6-Mbps upstream channel. |
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