olemus

(1) standardne laineala kiuoptilises sides
= a standard frequency band in fiber-optic communication


https://questtel.com/wiki/fiber-optics-wavelengths-bands-and-optical-transmission-windows

(2) failiedastust võimaldav ajalõik
=
a window of time in which certain file transfers are expected or allowed to occur
http://www.filetransferglossary.com/transmission-window/