This MIB module defines the managed objects for physical layer related interface configurations and objects for the protocol specific error counters for DWDM optical switches. This MIB contains four groups. The first group, cerentMsDwdmIfGroup, handles the physical layer related interface configurations. The second group, cerentMsDwdmOtnGroup, provides objects for configuring OTN (G.709) related thresholds and for collecting OTN (G.709) related performance statistics for the current and previous 15 min and 24 hour intervals. The third group, cerentMsDwdmFECGroup provides objects for monitoring FEC (Fault Error Correction) statistics for the current and previous 15 min and 24 hour intervals. It also contains objects for configuring FEC error thresholds. The fourth group,cerentMsDwdm8B10BGroup contains 8B10B counters, for the current and previous 15 min and 24 hour intervals for interfaces like Fiber Channel/Gig E.