OTN Overheads

The optical transport network (OTN) is a new optical transport hierarchy defined in ITU-T G.872, G.798 and G.709, which consists of an optical layer and an electrical layer. In addition, the electrical layer and optical layer have a corresponding management and monitoring mechanism and survivability mechanism.

The OptiX OSN 8800 T64(NA)/8800 T32(NA)/8800 T16(NA)/6800A/3800A completely supports the management overheads defined in ITU-T G.709. This involves following aspects:

realizes ESC management by using the generic communication channel (GCC) bytes.
uses the GCC0, GCC1, or GCC2 byte as the communication channel of the management information.
supports monitoring of the SM overhead and PM overhead in the OTN frame and report of the performance events of the SM payload and PM payload.
supports management of a maximum of six TCM sublayers.

In addition, the OptiX OSN 8800 T64(NA)/8800 T32(NA)/8800 T16(NA)/6800A/3800A/1800(NA) supports the monitoring overheads at the OTSn, OMSn and OCh layers defined in the OTN standard. Thus, the monitoring function at the OTN optical layer is achieved.