primary rate
| B-channel interface structure
| primary rate abbr. | |
| commun. IT | débit primaire |
| B-channel interface structure abbr. | |
| gen. | structure d'interface de canal B |
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| débit primaire | |||
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primary rate : 16 phrases in 7 subjects |
| Communications | 7 |
| Electronics | 1 |
| General | 3 |
| Municipal planning | 1 |
| Social science | 2 |
| Technology | 1 |
| Telecommunications | 1 |