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3.13 Escape Sequences .............................................................................. 52
3.14 Remote Configuration Commands....................................................... 53
3.15 Line Probe Commands ........................................................................ 54
3.16 Diagnostic Commands......................................................................... 55
Chapter 4 - S-Registers .................................................................................... 56
4.1 Introduction ........................................................................................... 57
4.2 S-Registers .......................................................................................... 57
4.3 Reading and Assigning S-Register Values ........................................... 63
4.3.1 Examples of Assigning Values ........................................................... 63
4.3.2 Examples of Reading Values.............................................................. 63
4.4 AT Commands Affecting S-Registers................................................... 64
Chapter 5 - Error Correction, Data Compression & Speed Conversion..... 65
5.1 Introduction ........................................................................................... 66
5.2 How V.42 Detects and Corrects Errors ................................................ 67
5.3 Data Compression ............................................................................... 68
5.4 MNP Classes........................................................................................ 68
5.5 V.42 Mode Select Command (#L)......................................................... 69
5.5.1 #L0 Command ..................................................................................... 69
5.5.1.1 Originate Mode ................................................................................ 69
5.5.1.2 Answer Mode ................................................................................... 69
5.5.2 #L1 Command ..................................................................................... 69
5.5.3 #L2 Command .................................................................................... 69
5.5.4 #L3 Command ..................................................................................... 69
5.6 Modes of Operation .............................................................................. 70
5.6.1 Non-Error Correction Mode (&E0)........................................................ 70
5.6.2 Reliable Mode (&E2) ........................................................................... 70
5.6.3 Autoreliable Mode (&E1) ..................................................................... 70
5.7 Flow Control ......................................................................................... 71
5.8 Modem-Initiated Flow Control ............................................................... 72
5.8.1 XON/XOFF Flow Control (&E5) ........................................................... 72
5.8.2 Hardware Flow Control (&E4) .............................................................. 72
5.9 Pacing (&E13) ...................................................................................... 73
5.9.1 XON/XOFF Pass-Through (&E7) ........................................................ 73
5.9.2 Non-Error Correction Mode Flow Control (&E10 and &E11) ................. 73
5.9.3 Hewlett Packard ENQ/ACK Pacing (&E9)........................................... 73
5.10 Compression, Error Correction, Flow Control,
and Pacing Commands........................................................................ 74
5.10.1 V.42 Error Correction Modes .............................................................. 74
5.10.2 Modem-Initiated Flow Control ............................................................. 74
5.10.3 XON/XOFF Pass-Through .................................................................. 74
5.10.4 Hewlett Packard ENQ/ACK Pacing..................................................... 74
5.10.5 Non-Error Correction Mode Flow Control ............................................. 74