light signal receiver-transmitte
automatic data pr interface unit
automatic data pr interface unit
fiber optic plug connector
communications switching set
data transfer interface unit
automatic data pr interface unit
data transfer interface unit
data transfer interface unit
data transfer interface unit
data transfer interface unit
data transfer interface unit
data transfer interface unit
data transfer interface unit
data transfer interface unit
data transfer interface unit
data transfer interface unit
data transfer interface unit
automatic data processing server
