ROADM sites can use WSMD9 single boards to support a maximum of 9 dimensions. If the number exceeds 9 dimensions, it can be realized by cascading WSMD9 single boards.

Question

Options

• ATrue
• BFalse

• A
  25% (7)
• B
  75% (21)

Explanation

Option B (False) is correct because the statement contains an inaccuracy about how WSMD9 boards handle expanded dimension requirements. While WSMD9 single boards do support up to 9 dimensions, cascading WSMD9 boards is not a valid method to exceed this limit - cascading does not simply add or multiply the supported dimensions in the way the statement implies. To support more than 9 dimensions at a ROADM site, different board configurations, additional hardware modules, or alternative architectural designs must be employed rather than chaining WSMD9 units together.

Option A (True) is incorrect because it accepts the flawed premise that cascading is a straightforward extension mechanism for the WSMD9 - this misrepresents how optical dimension expansion actually works in ROADM equipment.

Memory tip: Think of WSMD9 as a "9-door room" - you can't just stack rooms end-to-end and expect every door to remain independently accessible. Exceeding 9 dimensions requires a fundamentally different design, not a simple chain of the same boards. If the exam says "cascade to exceed the limit," that's almost always a red flag answer in ROADM questions.

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