External modems can also be dial-up modems, and if so, will be rated at a transfer rate of 56 kbps (kilobytes per second), like their internal twins. External modems are handy when there are no available internal slots, or if the modem needs to be shared between computers that are not networked. In this case an external modem connected to a desktop system, can easily be disconnected and connected to a different desktop, or even a laptop.
External modems for dial-up service are inexpensive and available everywhere computers are sold. They are easy to setup, come with instructions, and most include fax capability at the software level. Recent versions of most operating systems recognize and load drivers for dial-up modems, which are plug-and-play devices.
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مودمهای اکسترنال با پورت سریال خیلی راحت توی لینوکس قابل استفاده هستند در صورتی که برای نصب مودمهای اینترنال و اکسترنالی که به پورت USB وصل میشوند وقت قابل توجهی باید بگذاریم.
همیشه پیشنهاد برای استفاده از اینترنت در لینوکس استفاده از مودم اکسترنال با پورت سریال بوده و هست