they cannot they automatically fallback to V.34. High-end connection speed of V.34 and low end of V.90/92 overlap. To determine if the modem is in V.90/92 mode external modems typically include a mode indicator. For modems without this feature connect speed can be used to determine mode. If the modem reports 28,000, 29,333, 30,667, 32,000, 33,333, 34,667, 36,000 or higher it is in V.90/92 mode. If the report is 33,600, 31,200, Dale 56k , Dale, IN 56k DaleDale , 56k Indiana, Dale 56k
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