signal containing 10 odu2s the odu2s are mapped within an odtu group within the opu4 transported by the otu4 the otu4 is framed and encoded with forward error correction codes before being transmitted electrically over 4 u00d7 28 gbps otl 4 4 electrical lanes 513 b gray or wdm optics 512 b receives the otl4 4 electrical lanes and performs electrical to optical conversion the optical signal from gray or wdm optics 512 b is blocked by voa 546 until the service provider has verified the acceptability of the optical data plane signal passing there through the receive path is the reverse of the transmit path fig6 shows a slave configuration with demarcation point 660 between g 709 blocks 614 a and 614 b and the pcs blocks 616 a and 616 b in this embodiment the host controls up to 10 ethernet u2122 macs with corresponding pcs layers the host here determines the pcs blocks 616 a and 616 b configuration of electrical lanes 615 a and 615 b including their mapping to the corresponding macs slave controller 650 controls gray or wdm optics 612 a and 612 b and g 709 blocks 614 a and 614 b using control paths 651 a and 651 b when electrical lane mapping is controlled by the host the host will assign a particular lane to each mac and load the configuration of lanes to macs inside memory 554 using i 2 c interface 655 the service provider management domain will verify the mapping in memory 554 provided.