During FTTH VolP service configuration, the MG interface status fails. Which of the following reasons is not possible?

Question

Options

• AParameter configuration error
• BNetwork link failure
• CUplink port failure
• DDownstream port failure

• A
  4% (2)
• B
  18% (8)
• C
  7% (3)
• D
  71% (32)

Explanation

Option D is correct because the downstream port connects to end-user devices (e.g., a telephone handset or LAN port), and its failure does not affect the MG (Media Gateway) interface status - the MG interface represents the signaling/registration link between the gateway and the softswitch (MGC), which is entirely on the network side.

• A is a valid cause: Incorrect parameters (IP addresses, ports, codec settings, signaling credentials) directly prevent the MG from successfully registering with the MGC.
• B is a valid cause: A broken network link severs the path between the MG and the MGC, so the interface status cannot come up.
• C is a valid cause: The uplink port carries traffic from the ONU/ONT toward the core network; if it fails, the MG loses its network path and the interface fails.

Memory tip: Think of the MG interface as a network-side handshake - anything that disrupts the path toward the network (config, link, uplink) can break it, but downstream (user-side) port failures only affect what's behind the gateway, not the gateway's registration with the network.

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