| Quality bit | Description |
|---|---|
| smpSynch |
Synchronization accuracy for all channels in the SMV frame. 0: less than 4 µs synchronization accuracy 1: within 4 µs synchronization accuracy |
| test bit | The sender IED is in test mode. |
| invalid 01 & bad reference | The sender time synchronization is uninitialized (accuracy unknown). |
| The sender has time accuracy less than 100 ms. | |
| invalid 01 | The channel is not available. |
| questionable 11 & inaccurate | The accuracy of the measurement value is inaccurate or not supported. |
| derived | The channel is derived from other channels, for example, calculated residual voltage. |