Document Outline

• Introduction 1
  • 1.1 Controllerless Modem Driver Overview
    • 1.1.1 Windows* Millennium Edition (Windows Me), Windows 2000, Windows XP, and Windows NT* 4
      • Figure 1. WDM Driver Block Diagram
    • 1.1.2 Windows 95 and Windows 98
      • Figure 2. VxD Mini Port Driver Block Diagram
  • 1.2 V.90/V.92 and V.34 Data Modes
  • 1.3 Modem Connection Overview
    • Table 1. DTE-to-DCE Data Rates for Each Mode
    • Table 2. DCE-to-DCE Data Rates for Each Mode
    • Table 3. DCE-to-ISP Data Rates for V.90 Mode
  • 1.4 AT Commands Overview
    • 1.4.1 Sending Commands
      • Table 4. DTE-Modem Data Rate Response Codes
    • 1.4.2 AT Escape Sequences
    • 1.4.3 Dial Modifier
• AT Command Summary Tables 2
  • Table 5. Data Mode Command Summary
  • Table 6. V.44/V.42/V.42 bis MNP Command Summary
  • Table 7. Fax Identity Command Summary
  • Table 8. Fax Class 1 Command Summary
  • Table 9. IS-101 Voice Command Summary
  • Table 10. Voice DTEÆDCE Character Pairs
  • Table 11. Voice DTE¨DCE Character Pairs
  • Table 12. Dial Modifiers
  • Table 13. S-Register Summary
• Data Mode AT COMMANDS 3
  • 3.1 Using AT Commands to Access the S-Registers [Sn?, Sn=x, ?]
  • 3.2 Modem Responses and Command Echo [En, Vn, Xn, Wn, Qn]
    • Table 14. Data Reporting Wn Mapping
    • Figure 3. Example of a Remote Connection
  • 3.3 Modem Reset and NVRAM Commands [DS=m, Zn, &F, &Vn, &Yn, &Wn, &Zn=x]
  • 3.4 Modem Identification Commands [In, +FMI, +FMR, +FMM, +GMI, +GMM, +GMR, +GSN, +FMFR?, +FMDL?, ...
    • Table 15. Product Identification Information
  • 3.5 Establishing a Modem Connection [A, D, DS = n, S0]
  • 3.6 Online Command Mode [Escape Codes, On]
  • 3.7 Hanging Up [Hn, S10, Zn, &D2]
  • 3.8 Modem-to-Modem Connection Data Rates
    • Figure 4. Modem-on-Hold: Incoming Voice Call in Data Mode
    • Figure 5. Modem-on-Hold: Initiating a Voice Call in Data Mode
    • Table 16. Supported Modulation Types
    • Table 17. Resulting Modem-to-Modem Connection Rates with Non-Default Values
  • 3.9 Diagnostic Testing [S18, &Tn]
    • 3.9.1 Local Analog Loopback [AT&T1]
      • Figure 6. Local Analog Loopback Test
    • 3.9.2 Local Analog Loopback With Self-Test [AT&T8]
      • Figure 7. Local Analog Loopback with Self-Test
  • 3.10 AT Escape Sequences
    • 3.10.1 Time-Independent Escape Sequence
    • 3.10.2 Hayes* Escape Sequence
      • Table 18. Data Mode Command Descriptions
• Error Correction and Data Compression 4
  • Table 19. Operating Modes
  • Table 20. Resulting +ES Connection Types
  • Table 21. V.44/V.42/V.42 bis and MNP Data Modem Command Descriptions
• Fax Class 1 AT Commands 5
  • 5.1 Fax Identity Commands
    • Table 22. Fax Identity Command Descriptions
  • 5.2 Fax Class 1 Commands
    • Table 23. <mod> Selection Table
    • Figure 8. T.30 HDLC Frame Format
    • Figure 9. CLASS 1 DTE-Generated HDLC Frame Information (AT+FTH=<mod>)
    • Figure 10. CLASS 1 DTE Reception of HDLC Frame Information (AT+FRH=<mod>)
    • Table 24. Fax Mode Command Descriptions
• IS-101 Voice Mode AT Commands 6
  • 6.1 DTMF Detection Reporting
  • 6.2 Relay Control
    • Table 25. Voice Mode Command Descriptions
• S-Registers 7
  • Table 26. S-Register Command Descriptions
• Caller ID 8
  • Table 27. Caller ID Tags for Formatted Reporting
• Parallel Host Interface 16C450/16C550A UART 9
  • 9.1 UART Emulation in the Controllerless Modem
    • Figure 11. UART Emulation in Intelsdb.VxD
    • Figure 12. FIFO Buffers for Transmitter and Receiver
    • Figure 13. Parallel Host Interface UART Register Bit Assignments
  • 9.2 UART Register Definitions
    • 9.2.1 Scratch Register (SCR)
      • Figure 14. Scratch Register (SCR)
    • 9.2.2 Modem Status Register (MSR)
      • Figure 15. Modem Status Register (MSR)
    • 9.2.3 Line Status Register (LSR)
      • Figure 16. Line Status Register (LSR)
    • 9.2.4 Modem Control Register (MCR)
      • Figure 17. Modem Control Register (MCR)
    • 9.2.5 Line Control Register (LCR)
      • Figure 18. Line Control Register (LCR)
    • 9.2.6 FIFO Control Register (FCR)
      • Figure 19. FIFO Control Register (FCR)
    • 9.2.7 Interrupt Identity Register (IIR)
      • Figure 20. Interrupt Identity Register (IIR)
      • Table 28. Interrupt Control Functions
    • 9.2.8 Interrupt Enable Register (IER)
      • Figure 21. Interrupt Enable Register (IER)
    • 9.2.9 Transmitter Holding Register (THR)
      • Figure 22. Transmitter Holding Register (THR)
    • 9.2.10 Receiver Buffer Register (RBR)
      • Figure 23. Receiver Buffer Register (RBR)
    • 9.2.11 Divisor Latch Registers (DLM and DLL)
      • Figure 24. Divisor Latch Registers (DLM and DLL)
      • Table 29. Programmable Data Rates 
  • 9.3 16C550A UART FIFO Operation
    • 9.3.1 FIFO Interrupt Mode Operation
    • 9.3.2 FIFO Polled Mode Operation