Which of the following are not light release? (Multiple Choice)

Question

Options

• AOAU
• BOTU
• COBU
• DOTM

• A
  7% (2)
• B
  80% (24)
• C
  13% (4)

Explanation

Options B (OTU) and D (OTM) are not light release units because they involve electrical signal processing. An OTU (Optical Transponder Unit) performs O-E-O (optical-electrical-optical) conversion, regenerating the signal electrically rather than passing light through transparently. An OTM (Optical Terminal Multiplexer) is a terminal node that also terminates and processes signals at the electrical layer, disqualifying it from being a light release device.

By contrast, OAU (Optical Amplifier Unit) and OBU (Optical Booster Unit) are light release units because they amplify optical signals purely in the optical domain - no electrical conversion occurs, so light passes through and is released transparently.

Memory tip: Think of "light release" as light that flows freely without conversion. If the unit has "Amplifier" or "Booster" in its name (OAU, OBU), it stays in the optical domain - light in, light out. If the unit has "Transponder" or "Multiplexer" (OTU, OTM), it touches the electrical layer and breaks the optical transparency, so it is not a light release unit.

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