This content summarizes all Ethernet processing board loopbacks for OptiX OSN series products. A "Y" indicates that the board supports the feature, and an "N" indicates that the board does not support the feature.

OSN3500 transmission equipment Ethernet single board loopback description

Single board	MAC Layer Outer Loopback	MAC layer inner loopback	PHY layer outer loopback	PHY layer inner loopback	VC-4 inner loopback, VC-4 outer loopback	VC-3 inner loopback, VC-3 outer loopback
N1EFS4	N	N	N	Y	N	Y
N2EFS4	N	N	N	N2EFS4	N	Y
N3EFS4	N	N	N	Y	N	N
N1EFS0	N	N	N	N1EFS0	N	Y
N2EFS0	N	N	N	N	N	N
N4EFS0	N	N	N	N4EFS0	N	N
N5EFS0	N	N	N	N5EFS0	N	N
N1EFS0A	N	N1EFS0A	N	N1EFS0A	N	N
N1EGT2	N	N	N	Y	N	N
N2EGT2	N	N	N	Y	N	N
N1EFT8	N	N1EFT8	N	N1EFT8	N	N
N2EFT8	N	N2EFT8	N	N2EFT8	N	N
N1EFT8A	N	N1EFT8A	N1EFT8A	N1EFT8A	N	N2EFT8A
N2EFT8A	N	N2EFT8A	N2EFT8A	N2EFT8A	N	Y
R1EFT4	R1EFT4	R1EFT4	R1EFT4	R1EFT4	N	Y
N1EMS4	N	N	N	N	N	N
N1EMS2	N	N	N	Y	N	N
N1EGS4	N	N	N	Y	N	N
N3EGS4	N	N	N	Y	N	N
N2EGS4	N	N	N	Y	N	N
N4EGS4	N	N	N	Y	N	N
N2EGS2	N	N	N	Y	N	Y
N3EGS2	N	N	N	N3EGS2	N	N
N2EGR2	N	Y	N	Y	N	N
N2EMR0	N	N	N	Y	N	N
N1EAS2	N	N1EAS2	N	N1EAS2	N	N
N3EAS2	N	N3EAS2	N	N3EAS2	N	N
N1EFP0	N	N1EFP0	N	N1EFP0	N	N
N1EGSH	N	N1EGSH	N	N1EGSH	N	N

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