Which layer distinguishes the two types of the 10 Gigabit Ethernet technologies: LAN PHY and WAN PHY?
Click on the arrows to vote for the correct answer
A. B. C. D.D.
The layer that distinguishes the two types of 10 Gigabit Ethernet technologies - LAN PHY and WAN PHY - is the Physical Medium Dependent Sublayer (PMD).
Ethernet operates at the Physical layer of the OSI model, and the PMD is the layer that manages the transmission of signals over the physical medium (i.e., the cables or fibers that carry the data). The PMD is responsible for encoding and decoding the data into a format that can be transmitted over the physical medium.
In the case of 10 Gigabit Ethernet, there are two different types of PMD sublayers that are used to distinguish between LAN PHY and WAN PHY technologies: 10GBASE-LR/LW and 10GBASE-ER/EW.
10GBASE-LR/LW (long-range/long-wave) is used for LAN PHY applications, where the transmission distance is up to 10 kilometers over single-mode fiber optic cabling. It uses a wavelength of 1310 nm and supports a maximum transmission distance of 10 km.
On the other hand, 10GBASE-ER/EW (extended-range/extended-wave) is used for WAN PHY applications, where the transmission distance can go up to 40 kilometers over single-mode fiber optic cabling. It uses a wavelength of 1550 nm and supports a maximum transmission distance of 40 km.
Therefore, the correct answer to the question is C. Physical Medium Dependent Sublayer.