The document contains figures and descriptions of various telecommunications standards including different types of connectors, modem modulation techniques, baud rates, and international telecommunications union standards. Specifically it discusses DB connectors, RS-422 and RS-423 standards, bandwidth capabilities of telephone lines, and modulation schemes like ASK, FSK, and QAM used in V.22bis, V.32, and V.33 modems.

1. Figure 6-14
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DB-37 and DB-9 Connectors

2. RS-423: Unbalanced Mode
Figure 6-15
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3. RS-422: Balanced Mode
Figure 6-16
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4. Canceling Noise
Figure 6-17
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5. DB-15 Connector
Figure 6-18
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6. Figure 6-19
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Modem

7. Bandwidth for Telephone Line
Figure 6-20
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8. Baud Rate for Half-Duplex ASK
Figure 6-21
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9. Baud Rate for Full-Duplex ASK
Figure 6-22
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10. Baud Rate for Half-Duplex FSK
Figure 6-23
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11. Baud Rate for Full-Duplex FSK
Figure 6-24
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12. Bell Modems
Figure 6-25
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13. Bell Modems
Figure 6-25-continued
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14. ITU Modems
Figure 6-26
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15. ITU Modems
Figure 6-26-continued
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16. V.22bis 16-QAM Constellation
Figure 6-27
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17. V.32 Constellation
Figure 6-28
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18. V.33 ConstellationFigure 6-29
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