Which of the following descriptions of GPON Type C dual-homing protection is correct?

Question

Options

• ASimple networking and OLT/ONU management.
• BThe two PON lines between an ONU and two OLTs are in active/standby state.
• CBranch fiber protection is not supported.
• DOLT failure will cause service interruption.

• A
  6% (2)
• B
  79% (27)
• C
  3% (1)
• D
  12% (4)

Explanation

Option B is correct because GPON Type C dual-homing protection defines a topology where a single ONU maintains two separate PON line connections - each going to a different OLT - with one link active and the other on standby, enabling seamless failover at both the fiber and OLT level.

Why the distractors are wrong:

• A is wrong - Type C is actually the most complex dual-homing variant because it requires coordinating two OLTs and managing active/standby signaling between them; simple management is a characteristic of simpler protection types.
• C is wrong - Type C does support branch fiber protection; having two independent fiber paths to two separate OLTs is precisely what makes this type resilient against branch fiber cuts.
• D is wrong - OLT failure is exactly what Type C is designed to survive; when the active OLT fails, the standby PON line to the second OLT takes over without service interruption.

Memory tip: Think of the "C" in Type C as "Complete coverage" - it protects against both fiber breaks and OLT failures by connecting to two separate OLTs in active/standby, whereas simpler types only protect one layer of the network.

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