The total downstream bandwidth of the 10G EPON PON port is the sum of the EPON downstream bandwidth and the 10G EPON downstream bandwidth.

Question

Options

• ATRUE
• BFALSE

• A
  29% (7)
• B
  71% (17)

Explanation

Option B is correct because the total downstream bandwidth of a 10G EPON PON port is simply the 10G EPON downstream bandwidth (10 Gbps), not the arithmetic sum of both EPON and 10G EPON downstream values. In a 10G EPON system, legacy 1G EPON ONUs are served within the 10G downstream channel - their traffic is allocated from that shared 10 Gbps capacity rather than being carried on an independent, additive bandwidth plane. Adding the two figures would double-count bandwidth that is already subsumed by the 10G channel.

Why A is wrong: Treating the bandwidths as additive (e.g., 10 Gbps + 1 Gbps = 11 Gbps) misrepresents how 10G EPON coexistence works; the 10G downstream is the ceiling, not a supplement to the 1G channel.

Memory tip: Think of 10G EPON as a "superset" - the 10G downstream channel contains the capacity to serve 1G ONUs, so there is nothing to add. If you remember "superset, not sum," you won't be tricked by the additive-sounding wording.

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