oW4601 is a OLP (optical line protection) card used in eWAVE4107/3107, eWAVE4214/3214, and eWAVE2108 platform . It always provides 1+1 optical line protection on OTS layer or OMS layer. Support auto-switch and manual switch mode. Support revertive and non-revertive operation . Switch time less than 15ms . Hold off time can be set for multi-layer protection