Solution: Upgrade the preceding versions to the mainstream version OptiX OSN 8800 V100R009C10SPC300+SPH310.
The upgrade cannot be performed when the TN15LTX board is used on an NE of a version earlier than OptiX OSN 8800 V100R10C00SPC200.
Solution: Upgrade the NE version to OptiX OSN 8800 V100R10C00SPC200 or later.