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通路服务单元
| 数据服务单元
| 通路服务单元 | |
| telecom. | channel service unit |
| ATM 数据服务单元 | |
| IT | ATM data service unit |
| 数据服务单元 | |
| IT | data service unit |
| tech. | data service units |
| |||
| channel service unit (ISDN 交换局设备，与用户宅内的 DSU 连接) | |||
| 通路服务单元: 2 phrases in 1 subject |
| Telecommunications | 2 |
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