Which three statements about DWDM are true? (Choose three)

Question:
Which three statements about DWDM are true? (Choose three)

• It allows a single strand of fiber to support bidirectional communications
• It is used for long-distance and submarine cable systems
• It can multiplex up to 256 channels on a single fiber
• It supports both the SDH and SONET standards
• Each channel can carry up to a 1-Gbps signal
• It supports simplex communications over multiple strands of fiber

Explanation: A newer fiber-optic media development for long-range communications is called dense wavelength-division multiplexing (DWDM). DWDM multiplies the amount of bandwidth that a single strand of fiber can support.

DWDM circuits are used in all modern submarine communications cable systems and other long-haul circuits.

Specifically, DWDM:

+ Enables bidirectional communications over one strand of fiber -> Answer A is correct
+ Assigns incoming optical signals to specific wavelengths of light (i.e., frequencies)
+ Each channel is capable of carrying a 10-Gbps multiplexed signal -> Answer E is not correct
+ Can multiplex more than 80 different channels of data (i.e., wavelengths) onto a single fiber -> Answer C is not correct
+ Can amplify these wavelengths to boost the signal strength
+ Supports SONET and SDH standards

Reference: http://www.ciscopress.com/articles/article.asp?p=2202411&seqNum=6

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