What is DWDM/SDH/CWDM, TYPE OF ALARM, Defferent Between los and lof

Question

Accepted Answer

DWDM/SDH/CWDM are optical networking technologies. LOS and LOF are types of alarms indicating signal loss or failure.

DWDM (Dense Wavelength Division Multiplexing) is a technology that allows multiple data streams to be transmitted over a single optical fiber by using different wavelengths of light.
SDH (Synchronous Digital Hierarchy) is a standard for transmitting digital signals over optical fibers. It provides a way to multiplex different data streams and ensure their synchronization.
CWDM (Coarse Wavelength Division Multiplexing) is a similar technology to DWDM, but uses wider spacing between wavelengths.
LOS (Loss of Signal) is an alarm that indicates a loss of optical signal. This can be caused by a fiber break, equipment failure, or other issues.
LOF (Loss of Frame) is an alarm that indicates a failure in the synchronization of the data stream. This can be caused by a problem with the equipment or the signal itself.

Top Indovision Services Nok Engineer interview questions & answers