TrendNet TFM-561U 56K USB 2.0 Modem (Internet, Telephone, Fax)
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Review of Linux Compatibility
The TFM-561U is a 65K modem, which is connected to the USB port. The manufacturer explicitly mentions the Linux compatibility of the device.
The TFM-561U has the USB ID 0572:1329
Bus 002 Device 006: ID 0572:1329 Conexant Systems (Rockwell), Inc.
If the modem is connected to the USB-Port the Linux kernel (kernel version 3.1) recognized the device automatically:
usb 5-1: new full speed USB device number 3 using uhci_hcd usb 5-1: New USB device found, idVendor=0572, idProduct=1329 usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 5-1: Product: USB Modem usb 5-1: Manufacturer: Conexant usb 5-1: SerialNumber: 24680246 cdc_acm 5-1:1.0: ttyACM0: USB ACM device usbcore: registered new interface driver cdc_acm cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
and created the device file /dev/ttyACM0, which is used to access the modem:
>> minicom /dev/ttyACM0 Welcome to minicom 2.4 ...