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| You can improve the performance of your modem by doing these simple things. For high-speed modem connections set the serial port to use hardware handshaking (CTS/RTS.) The modem transfer speed is not determined simply by the modem's connection speed or the amount of compression. Some transfer protocols work faster than others. The fastest is ZModem, which is usually available. The Zmodem protocol allows you to resume a download right where you left off, in case your connection gets interrupted. |
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| There is a difference between connection speed and effective speed. Connection speed tells you how many characters are sent across in a given time. Effective speed tells you actually how many characters are transferred after data compression is accounted for. e.g. A V.34 modem can transmit 28,800 bits per second, but the effective speed may be 115.2 Kbps, due to compression, that happens during transmission. |
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| A modem can't usually connect at high speeds all the time. Modems go back to a lower speed if the line noise makes it hard to keep a fast connection. Some fall back to a lower speed too soon or for too long. To better the situation, search for the value S36= in the initialization string. Check your modem's settings in your manual, and if your modem allows it, change setting to S36=7. This setting will cause your modem to try connecting at high speeds in two ways before dropping back to a slow connection. |
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| You can use the Xon/Xoff protocol for your transmissions. The Xon/Xoff protocol avoids dropped characters on high speed connections and forces the port to wait for an OK before trying to process the next buffer of data. To set these options choose "Start," "Settings," "Control Panel," double click "Modems." Select your modem and click on the "Properties" button, click on the "Connection" tab and click on the "Advanced button." That will bring up a window with options with Xon/Xoff protocol. |
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