Which family of components for wavelength add/drop does the single module ROADM and 80- channel wavelength cross connect use?

Question

Options

• ANCS 4000
• BNCS 2002
• C15216 passive multiplexers
• D15600 passive multiplexers

• A
  6% (3)
• B
  2% (1)
• C
  89% (47)
• D
  4% (2)

Explanation

Option C is correct because Cisco's 15216 family is specifically designed as passive DWDM multiplexer/demultiplexer components, and both the single module ROADM and the 80-channel wavelength cross connect (WXC) rely on 15216 passive mux/demux modules to physically add or drop individual wavelengths at a node.

Why the distractors are wrong:

• A (NCS 4000) is a high-capacity packet-optical routing platform - an active chassis, not a passive add/drop component family.
• B (NCS 2002) is a shelf/chassis in the NCS 2000 series used for line cards and amplifiers, not a passive multiplexer family.
• D (15600 passive multiplexers) is a trap - the 15600 is a SONET/SDH multiservice switching platform; it is not the passive multiplexer family paired with ROADMs.

Memory tip: The 15216 number sits between 15000-series optical products and signals passive glass - think "16 wavelengths-and-more, passive." If a question mentions passive mux/demux for ROADM add/drop in Cisco's ONS/DWDM context, the 15216 family is almost always the answer.

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