Regarding the use of ADSL interleaving mode, which of the following statements is correct?

Question

Options

• AIncreased stability and long delay
• BIncreased stability and short delay
• CPoor stability and long delay
• DPoor stability and short delay

• A
  85% (22)
• B
  4% (1)
• C
  8% (2)
• D
  4% (1)

Explanation

ADSL interleaving mode improves line stability by spreading data across multiple time slots, which enhances Forward Error Correction (FEC) and makes the connection more resilient to burst noise and line impairments. However, this process requires buffering data on both ends to interleave before sending and de-interleave after receiving, which introduces additional latency, making the delay longer. Option A correctly captures both effects: better stability at the cost of increased delay.

Option B is wrong because while stability does increase, the delay is longer, not shorter. Option C is wrong because interleaving improves stability rather than degrading it, even though the long delay part is correct. Option D is wrong on both counts, as interleaving neither reduces stability nor shortens delay.

Memory tip: Think of interleaving like a safety net woven from multiple strands -- weaving takes extra time (longer delay), but the resulting net catches more errors (increased stability). The opposite mode, fast mode, skips the weaving and is faster but more fragile.

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