H31-341_V2.5 · Question #980
When a 80 wave ROADM site uses a TM20 for multiplexing, an ITL board must be configured.
The correct answer is A. True. A is correct because a TM20 is a 20-channel multiplexer, but an 80-wave ROADM site requires handling 80 wavelengths - four times what the TM20 covers alone. The Interleaver (ITL) board bridges this gap by combining multiple sets of wavelengths (typically separated by 100 GHz…
Question
When a 80 wave ROADM site uses a TM20 for multiplexing, an ITL board must be configured.
Options
- ATrue
- BFalse
How the community answered
(50 responses)- A80% (40)
- B20% (10)
Explanation
A is correct because a TM20 is a 20-channel multiplexer, but an 80-wave ROADM site requires handling 80 wavelengths - four times what the TM20 covers alone. The Interleaver (ITL) board bridges this gap by combining multiple sets of wavelengths (typically separated by 100 GHz spacing) into the denser 50 GHz spacing required for an 80-channel DWDM system. Without the ITL board, the wavelength plan cannot be properly constructed and the full 80-channel capacity cannot be achieved.
B is wrong because the ITL board is not optional in this configuration - it is architecturally required. Skipping it would leave the mux incapable of supporting the full wavelength grid for an 80-wave system.
Memory tip: Think of it as a math problem - a TM20 handles 20 channels, and 80 ÷ 20 = 4 groups. The ITL board is the "Interleaver" that weaves those groups together into one coherent 80-channel grid. If the mux count doesn't match the site's wave count, an ITL is mandatory.
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