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)......................................................... 6 9
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)........................................................ 7 0
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)................. 7 3
5.9.3 Hewlett Packard ENQ/ACK Pacing (&E9)........................................... 7 3
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..................................................... 7 4
5.10.5 Non-Error Correction Mode Flow Control .............................................74