SS F Pi (SFP) is a unit transmitter-receiver () can be installed hot, which usually used as input interface in the telecommunication systems of new generation (NGN), and in the light of today's use.

matching standard, module, 1300, and 1500 nanometer optical (laser) in the system, such as SMS, friend used.

SMS, FTP, PHP usually has a socket special on the motherboard, the host are, which includes preservatives, physical connection, signal. Some SMS, FTP, PHP, control, signal, and some alarms.