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window definition - telecom
  1. An opening or opportunity for passage of data frames or packets without the requirement for an acknowledgement from the receiving device. See modulo and TCP.
  2. An opening or opportunity for passage of a range of wavelengths in a fiber optic transmission system (FOTS). For example, a laser diode might fire at 1550 nm, referring to a range of wavelengths with a nominal center point of 1550 nm. A light-emitting diode (LED) might fire at 850 nm, and a vertical cavity surface-emitting laser (VCSEL) at 1300 nm or 1310 nm. The ITU-T has established a number of standard windows, as detailed in Table W-1. Generally speaking, the higher the transmission window (i.e., the longer the wavelength and lower the frequency), the less the signal attenuation, but the more expensive the associated electronics. See also attenuation, FOTS, frequency, laser diode, LED, VCSEL, and wavelength.
    Table W-1: ITU-T Transmission Windows
    Band DesignationWavelength Window
    850 Band810–890 nm
    O-Band (Original Band)1,260 nm­1,360 nm
    E-Band (Extended Band)1,360 nm­1,460 nm
    S-Band (Short Wavelength Band)1,460 nm–1,530 nm
    C-Band (Conventional Band)1,530 nm–1,565 nm
    L-Band (Long Wavelength Band)1,565 nm–1,625 nm
    U-Band (Ultralong Wavelength Band)1,625 nm–1,675 nm

Webster's New World Telecom Dictionary Copyright © 2008 by Wiley Publishing, Inc., Indianapolis, Indiana.
Used by arrangement with John Wiley & Sons, Inc.

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