(the codec in the line card for your line at the Telco switch) between you and the ISP. V.90/92 modems preferentially connect in V.90 mode if 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
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