| 1. | Digital cross connect system equipment sdh - base
同步数位阶层数位交换连接系统设备 |
| 2. | Digital cross connect system equipment sdh - based
同步数位阶层数位交换连接系统设备 |
| 3. | Digital cross connect system equipment sonet - base
同步光纤网路数位交换连接系统设备 |
| 4. | Digital cross connect system equipment sonet - based
同步光纤网路数位交换连接系统设备 |
| 5. | Circuit - switched connection
电路交换连接 |
| 6. | Non - switched connection
非交换连接 |
| 7. | Mobile phones with packet - switched communication appear to be " always connected " to the data network , whereas in the case of circuit - switched connections , setup time takes around 30 seconds to connect from a mobile phone to an isp
具有分组交换通信功能的手机似乎“始终连接”到数据网络，但是，对于电路交换连接，设置时间大约需要30秒才能将手机连接到isp 。 |
| 8. | When you connect to your isp ( internet service provider ) through a modem , you establish a switched connection to the isp , but it ' s actually carrying packets through a protocol called ppp or ( rarely now ) slip ( serial line internet protocol )
当你通过调制解调器连接到网络服务商时，你就和它建立一个交换连接，但实际上是通过称为点到点的协议或串行线路接口协议（现在很少使用）传送信息包的。 |
