visible light

The portion of the electromagnetic spectrum in the frequency range of 400 THz – 1 PHz

and has a wavelength of 750–380 nm.Visible light has no applications in telecommunications other than to make it possible for you to see what is going on and what you are doing about it. See also electromagnetic spectrum, frequency, Hz, and wavelength.

• protocol converter
• protocol data unit (PDU)
• protocol stack
• protocol suite
• protocol translator
• provider of last resort
• proxy
• proxy firewall
• proxy server
• proxy server
• PSAP (Public Safety Access Point)
• PSAP (Public Safety Access Point)
• PSC (Public Service Commission)
• PSE (Power Sourcing Equipment)
• pseudonoise (PN)
• pseudoquaternary coding
• pseudorandom noise (PN)
• pseudowire
• pseudowire emulation edge to edge (PWE3)
• pseudowire emulation (PWE)
• PSK (Phase-Shift Keying)
• PSP (Payphone Service Provider)
• PSQM (Perceptual Speech Quality Measurement)
• PSQM+ (Perceptual Speech Quality Measurement plus)
• PSS1 (Private Signaling System No. 1)