Different
spectral guidelines yield different performance results, so the effective throughput of
the technology is limited by the governing spectrum rules of the local country. EFM
technologies are internationally deployable anywhere in the world, provided they are
configured to conform to the regional guidelines.
Transporting Ethernet Packets over Copper
A long-standing tradition in Ethernet is that the method for carrying the actual frames
over the wire must (1) have low overhead and (2) be incredibly resilient to false packet
acceptance. False packet acceptance (FPA) is the probability of undetected corruption.
The EFM copper technologies use a novel encoding scheme called 64/65-octet encoding,
where there is 1 overhead byte for every 64 bytes of data. This encoding scheme
is incredibly efficient, which is vital in access technologies that must adapt to the
environment and deliver the highest possible speed given existing outside plant conditions.
Unlike traditional LAN Ethernet, the cable plant for Mid-Band Ethernet is old,
uncontrolled, and irreplaceable (if it is going to be replaced, it will be replaced with
optical fiber).
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