What is the next-generation development prospect of the access network?

Question

Options

• Aexpand PSTN Applications
• BIncrease in ADSL Type of business transmitted on
• CLight advances and retreats
• DPromote ADSL Transmission distance, increase coverage radius

• A
  9% (3)
• B
  16% (5)
• C
  72% (23)
• D
  3% (1)

Explanation

Option C refers to the principle of "optical advances, copper retreats" (光进铜退 in Chinese telecom terminology) - meaning fiber optic infrastructure progressively replaces legacy copper-based networks as the dominant next-generation access technology, offering dramatically higher bandwidth, lower latency, and greater scalability than anything copper can achieve.

Why the distractors are wrong:

• A (Expand PSTN): PSTN is a legacy circuit-switched telephone network being phased out, not expanded - next-gen development moves away from it.
• B (Increase ADSL business): ADSL is a copper-based DSL technology; while still in use, it is not the next-generation direction - fiber is replacing it.
• D (Promote ADSL transmission distance): Extending ADSL coverage still relies on copper and represents incremental improvement of an aging technology, not a next-generation leap.

Memory tip: Think of the phrase "fiber in, copper out" - every distractor involves maintaining or expanding copper-era technology (PSTN, ADSL), while the correct answer captures the fundamental directional shift: optical fiber advances as copper retreats.

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