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How efficient is EPON ?

The Ethernet encapsulation (framing) overhead is a result of adding 8-byte frame preamble, 14-byte Ethernet header, and 4-byte FCS field to MAC Service data units (m_sdu) comprised of user’s data. Additionally, at least 12-byte minimum inter-frame gap (IFG) should be left between two adjacent frames. Thus, the absolute overhead per one frame is constant and equal to 38 bytes (see Figure 1). This encapsulation overhead is not specific to EPON, but a property common to all Ethernet networks.