A modem that plugs into the USB port of a computer. The term states only that the connection to the computer is via USB but does not imply which network service is supported. It often refers to a ...

Enter the isolated USB null-modem. The device consists of two USB Communication Device Class, or CDC chips, creating a USB serial port for each attached computer. The TX and RX lines are cross ...

For older laptops, modems may be available for ExpressCard or PC Card/CardBus slots. A cellular modem via USB is a "USB modem." On a card, it can be an "air card," "data card" or "broadband card." ...