Pay attention to the following problems in the conversion process of the line ports.
1. The NMS supports an upgrade from STM-1 services to STM-4 services, and STM-1 services can be directly changed to STM-4 services on the T2000 or U2000.
2. The NMS does not support a downgrade from STM-4 services to STM-1 services. Run the following command to change the services.
Where, dangerous indicates the changed password.
3. When upgrading STM-1 services to STM-4 services, you do not need to delete the logical board and the corresponding configuration data and cross-connections.
When downgrading from STM-4 services to STM-1 services, you need to delete the logical board and the corresponding configuration data and cross-connections. For this reason, the T2000 does not support this function, and commands are required for the downgrade.
4. When upgrading from STM-1 services to STM-4 services, ensure that the optical module operates at a rate of 622 Mbit/s.After the downgrade from STM-4 services to STM-1 services, you can use a 155 Mbit/s or 622 Mbit/s optical module. If the STM-1 line board uses a 622 Mbit/s optical module, the LASER_MOD_ERR_EX alarm may be reported, indicating that the port does not match with the optical module.
The OptiX OSN 500 supports conversion between line ports for STM-1 and STM-4 services. During the conversion period, some issues need to be considered, for example, change modes, change conditions, and alarms.Exercise caution in practice.