10 GE Nomenclature
Optics/ PMDs physical media dependent layer
S stands for 850 nm
L = 1310 nm
E = 1550 nm
Unless otherwise stated the PMD is serial
Encoding
X = 8B/10B encoding
R = 64B/66B encoding
W = STS-192c encapsulation of 64B/.66B encoding by using the WAN interface sublayer (WIS)
Example: 10GBASE-LX4 is the 4 channel WWDM PMD