Software Flow Control .............................................................. 11-2Received Data Flow Control ............................................................ 11-3Transmit-Data Flow Control ............................................................ 11-512 H ANDSHAKING , ERROR CONTROL , DATA COMPRESSION , ANDTHROUGHPUTHandshaking .................................................................................. 12-1Selective Reject ......................................................................... 12-1V.34 .......................................................................................... 12-3V.90 Capabilities ............................................................................. 12-3Other Protocols .............................................................................. 12-3x2 ............................................................................................. 12-3Fast Class (V.FC) Handshaking ................................................... 12-3HST ........................................................................................... 12-4USR V.32terbo to USR V.32terbo ............................................... 12-4Lower-speed V. Protocols ........................................................... 12-5Error Control .................................................................................. 12-5Error-Control Commands .......................................................... 12-5V.42 Error Control ..................................................................... 12-7MNP Error Control ..................................................................... 12-7Error Control and Flow Control ................................................. 12-7Data Compression .......................................................................... 12-8V.42bis versus MNP5 Data Compression .................................... 12-8Getting Maximum Throughput ....................................................... 12-9Maximum throughput results when: ............................................... 12-913 D ISPLAYING QUERYING AND HELP SCREENSOverview ........................................................................................ 13-1Querying ........................................................................................ 13-1Displaying Help .............................................................................. 13-314 TESTING THE C ONNECTIONOverview ........................................................................................ 14-1Testing the Business Modem using AT&Tn ...................................... 14-2Analog Loopback Testing .......................................................... 14-3Stopping a Test (AT&T0, ATS18) ................................................ 14-3
