According to the building fire rating and fire-resistant material requirements, cabling system should take appropriate measures. In flammable region and shafts in the building wiring should be used flame retardant cable or fiber optic cable; in large public places should adopt flame retardant, low smoke, low toxicity cable or fiber optic cable; between adjacent equipment room or the transfer should be used flame retardant wiring devices.

DWDM is an optical fiber communication transmission technology, it is the use of an optical fiber can simultaneously transmit a plurality of different wavelengths of light characteristic wavelength range into the fiber may be applied to a number of bands, each band used a separate channel to transmit a predetermined wavelength of the optical signal technology.