 |
| |||
| exchange line junction; exchange line circuit | |||
| CO trunk circuit; central office trunk circuit; PBX trunk circuit | |||
| joncteur reseau: 6 短语, 2 学科 |
| 电信 | 1 |
| 通讯 | 5 |
|
| |||
| exchange line junction; exchange line circuit | |||
| CO trunk circuit; central office trunk circuit; PBX trunk circuit | |||
| joncteur reseau: 6 短语, 2 学科 |
| 电信 | 1 |
| 通讯 | 5 |