The NS2 does not support the configuration of BER threshold before FEC on the T2000. No QoS-related alarm management interface is available on the T2000. Therefore, the pre-FEC BER threshold cannot be configured on the T2000.
Install a hot patch to the T2000 of version V2R5C01. Add an interface for configuring the pre-FEC BER threshold. In the case of the T2000 of version V2R4, run commands to set the pre-FEC BER threshold, if necessary.