In the GPON network, what will happen to the ONT's long light emission?

Question

Options

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

• A
  16% (8)
• B
  74% (37)
• C
  8% (4)
• D
  2% (1)

Explanation

In GPON, upstream transmission uses TDMA (Time Division Multiple Access), meaning all ONTs under the same PON port share a single upstream channel via a passive optical splitter. When one ONT emits light continuously ("rogue ONT"), it occupies the shared upstream medium non-stop, preventing other ONTs on that PON port from transmitting in their assigned time slots - disconnecting them. B is correct because the impact is physically bounded by the shared fiber path of that single PON port.

A is wrong because there is a real impact - upstream communication is disrupted for co-located ONTs. C is wrong because each PON port has its own independent upstream channel; ONTs on other PON ports of the same OLT use completely separate fibers and are unaffected. D is wrong because only scenario B can occur - the fault is isolated to the shared medium of one PON port.

Memory tip: Think of a PON port as a single conference call line. If one participant talks without stopping, only people on that same call are blocked - other calls on the same phone system carry on normally.

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