2.4.6 PMD (Physical Medium Dependent) Sublayer
The PMD sublayer connects the PMA to the medium, and it is a medium dependent
interface. The PMD functions and types vary depending on the type of PCS and PMA,
but in general the functions performed by the PMD include transmission and reception of
the serial bit stream on the underlying physical medium and an optional loop-back
function at the PMD service interface.
The PMD types vary depending on the type of physical medium used and these are
shown in Table 2.3 along with the associated PCS versions.
PMD
Description
Associated PCS
10GBASE-SR
850nm serial LAN PHY
64/66B
10GBASE-LR
1310nm serial LAN PHY
64/66B
10GBASE-ER
1550nm serial LAN PHY
64/66B
10GBASE-SW
850nm serial WAN PHY
64/66B
10GBASE-LW
1310nm serial WAN PHY
64/66B
10GBASE-EW
1550nm serial WAN PHY
64/66B
10GBASE-LX4
13 lOnm parallel LAN PHY
8/10B
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