A   B   C   D   E   F   G   H   I   L   M   N   O   P   R   S   T   U   V   W 

FTP

File Transfer Protocol is a method of transferring files over the Internet between a server and a local computer.

FXO

Foreign eXchange Office interface.

The Foreign eXchange Office interface is the port on the ATA, phone, or fax machine that you plug the phone line into in order to get phone service on that particular device.

FXS

Foreign eXchange Subscriber interface.

The Foreign eXchange Subscriber is the port, in an analog phone system, where the line is delivered. It is the wall jack that you must plug your phone line into in order to recieve service.