single
channel per | carrier
PCM | multiple
| access
demand assignment equipment
| single | |
| mus. | single |
| carrier | |
| industr. construct. | accelerant |
| multipel | |
| gen. | multiple |
| access | |
| commun. | call origination |
| |||
| single | |||
|
single : 36 phrases in 15 subjects |