Why is a plug-in TA faster than an external TA?
Because computer serial ports tend to max out at around 115 kbps and are asynchronous, not synchronous, which means individual data bits are enclosed by additional start and stop bits and transferred at varying intervals. These extra bits can add a 10% overhead. So even with a 64 kbps or 128 kbps synchronous connection to your ISP, the connection between your TA and computer is still asynchronous. A card that plugs into your computer’s internal data buses, however, takes the synchronous data right into the heart of your computer.
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