The Metro 2050 is connected to the OSN 1500B through the management network port using a crossover network cable for extended ECC communication, because both are terminal devices and Metro 2050 does not support auto-sensing.
On the DCC Management page, the OSN 6800 port corresponding to OSN 1800 needs to be deleted before OSN 1800 can be managed on the NMS. The operation procedure is as follows: Select the OSN 6800 device, and click DCC Management in the Function Tree. In DCC rate configurations, delete the GCC12_18 channel on the OSN 6800 port corresponding to OSN 1800.