1.

Explain the EPON Frame format.

Answer»

EPON operation is based on the Ethernet MAC and EPON frames (based on GbE frames), but extensions are needed −

  • MultiPoint Control Protocol PDUs − This is the control protocol implementing the required logic.

  • Point-to-point emulation (reconciliation) − This makes the EPON looks like a point-to-point link and EPON MACs have some special constraints.

  • Instead of CSMA/CD, they transmit when granted.

  • Time through MAC stack must be constant (± 16 bit durations).

  • Accurate local time must be maintained.


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