The backplane has two -48V power lines. Each board gets two 48V power supplies from the backplane. Various voltages required for each component are obtained through DC/DC power supply modules and…

Question

Options

• ATrue
• BFalse

• A
  70% (37)
• B
  30% (16)

Explanation

Option A is correct because this accurately describes a common power architecture used in telecom and networking chassis equipment. The backplane distributes dual -48V feeds (negative 48V, standard in telecom DC power systems) to each line card, providing redundancy so that failure of one supply doesn't bring down the board. DC/DC converters then step those voltages down (or up) to the specific rails each component requires (e.g., 3.3V, 1.8V, 1.2V for ASICs, FPGAs, and memory), while diodes combine the two 48V inputs so the board seamlessly draws from whichever supply is live.

Option B is wrong simply because all the described behaviors - dual -48V lines, per-board dual feeds, diode combining, and DC/DC conversion - are real, standard design practices in carrier-grade equipment.

Memory tip: Think of the power chain as a funnel: two fat -48V pipes from the backplane → diodes merge them into one safe path per board → DC/DC modules chop that into whatever voltages each chip needs. "Diodes protect, DC/DC converts" is the core idea.

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