JN0-102 · Question #14
Which two statements are true about optical networks? (Choose two.)
The correct answer is A. SONET and SDH both use time-division multiplexing. D. An optical transport network system uses wavelength-division multiplexing. SONET and SDH primarily utilize Time-Division Multiplexing (TDM) for signal aggregation, whereas Optical Transport Network (OTN) systems predominantly employ Wavelength-Division Multiplexing (WDM) to maximize fiber capacity.
Question
Which two statements are true about optical networks? (Choose two.)
Options
- ASONET and SDH both use time-division multiplexing.
- BAn optical transport network system uses time-division multiplexing.
- CSONET and SDH both use wavelength-division multiplexing.
- DAn optical transport network system uses wavelength-division multiplexing.
How the community answered
(18 responses)- A89% (16)
- B6% (1)
- C6% (1)
Why each option
SONET and SDH primarily utilize Time-Division Multiplexing (TDM) for signal aggregation, whereas Optical Transport Network (OTN) systems predominantly employ Wavelength-Division Multiplexing (WDM) to maximize fiber capacity.
Synchronous Optical Network (SONET) and Synchronous Digital Hierarchy (SDH) are standards that primarily use Time-Division Multiplexing (TDM) to combine multiple lower-rate digital signals into a single, higher-rate optical signal.
While TDM is a multiplexing technique, OTN systems are specifically designed around WDM for capacity, although TDM may be used within the individual channels.
SONET and SDH primarily use TDM, not WDM, for multiplexing signals.
An Optical Transport Network (OTN) system, defined by ITU-T G.709, leverages Wavelength-Division Multiplexing (WDM) to transmit multiple data streams concurrently over a single optical fiber using different wavelengths of light.
Concept tested: Optical networking multiplexing techniques (TDM, WDM)
Source: https://www.itu.int/rec/T-REC-G.709-201211-I/en
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