While the term USB modem refers to any type of data/fax/voice modem
device which can be connected to a computer using USB
, the term more commonly describes a specific portable USB device that looks similar to a USB flash drive
and can be as small as 100 x 35 x 23mm in physical size and weigh only around 25grams . These small portable USB fax modems do not require a power source and can be plugged into any USB port on your PC
, or Macintosh computer
and can also be disconnected from the computer without turning off the system. One end of the portable USB modem will have a USB interface
, while the other end will have an RJ-11
port for connecting your phone line.
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