In the GPON network, the long-lasting ONT will cause which of the following results?

Question

Options

• AAll business is normal, no impact
• BOther ONT under the same PON port are disconnected
• COther ONT under the entire OLT are disconnected
• DAll of the above are possible

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

Explanation

In GPON, all ONTs sharing the same PON port transmit upstream using Time Division Multiple Access (TDMA) - each ONT gets a specific time slot. When one ONT transmits for too long (a "rogue" or long-lasting ONT), it collides with the time slots of other ONTs on that same PON port, disrupting their upstream communication and causing disconnection. Because the disruption is physically contained to the shared fiber segment of that single PON port, ONTs on other PON ports of the OLT are completely unaffected - ruling out option C. Option A is wrong because there is always a real impact; the rogue transmission is a collision on a shared medium. Option D is wrong because only B consistently describes the outcome - the fault boundary stops at the PON port level, not the ONT level and not the entire OLT.

Memory tip: Picture a PON port as a shared walkie-talkie channel. If one user holds the button too long, everyone on that channel gets jammed - but users on other channels hear nothing wrong.

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