Which statement about guardbands and clock skew management in distributed mission computers is true?

Which statement about guardbands and clock skew management in distributed mission computers is true?

• A. Guardbands set the maximum data rate.
• B. Guardbands define the color coding for cables.
• C. Guardbands apply only to clock frequency stability.
• D. Guardbands bound the maximum timing deviation and are used with holdover and local oscillators to manage skew.

Answer: (D)

Guardbands define the maximum permissible timing deviation between clocks in a distributed system. In distributed mission computers, keeping timing in lockstep is crucial so data from different parts of the system remains coordinated. Guardbands provide a safety margin around the clock edges, ensuring that even if a node’s clock drifts during holdover or from the less-stable local oscillator, the overall timing stays within acceptable limits. This helps prevent data misalignment or timing errors that could cascade through the system. Guardbands are specifically about bounding timing differences, and they’re used together with holdover strategies and local oscillators to manage skew. They don’t set data rates, aren’t about cable color coding, and aren’t limited to clock frequency stability alone.

Guardbands define the maximum permissible timing deviation between clocks in a distributed system. In distributed mission computers, keeping timing in lockstep is crucial so data from different parts of the system remains coordinated. Guardbands provide a safety margin around the clock edges, ensuring that even if a node’s clock drifts during holdover or from the less-stable local oscillator, the overall timing stays within acceptable limits. This helps prevent data misalignment or timing errors that could cascade through the system. Guardbands are specifically about bounding timing differences, and they’re used together with holdover strategies and local oscillators to manage skew. They don’t set data rates, aren’t about cable color coding, and aren’t limited to clock frequency stability alone.