1> SR4-SR4: Connect directly over a multi-mode fiber with MPO/MTP interface
2>LR4-LR4: Connect over a single-mode fiber with LC interface
3>PSM4-PSM4: Connect over a single-mode fiber with MPO/MTP interface
1>SR4-SR4: Connect over a multi-mode fiber with MPO/MTP interface separated to 4 transceivers with LC interface, each of them is 10G
2>PSM4-LR4: Connect over a single-mode fiber with MPO/MTP interface separated to 4 transceivers with LC interface, each of them is 10G.