| 1. | Digital line signalling for intertoll exchange
长途电话交换局间数字型线路信号 |
| 2. | A telephone cable from a local exchange to a central exchange
一种从本地交换局到中心交换局的电话电缆。 |
| 3. | Combined local transit exchange
市话中继混合交换局 |
| 4. | Earliest community automatic exchange network installed in wisconsin
威斯康星州首次安装社区自动交换局网络。 |
| 5. | Automatic telephone exchange
自动电话交换局 |
| 6. | Small exchange configuration
小型交换局配置 |
| 7. | Circuit switching exchange
电路交换的交换局 |
| 8. | The total capacity of public switching exchanges corresponds to the maximum number of main lines that can be connected
公用交换局总容量指的是可连接的最大主线数。 |
| 9. | All these changes took place after the first spc exchange was put into service in the capital in 1984 , enabling the use of pcm circuits for local trunks
这是从1984年北京开通第一个程控交换局，首次在市内中继使用pcm数字电路之后巨大的变化。 |
| 10. | For example , telephony as a universal service should serve areas where there are residences by the establishment of exchange offices and the wiring of subscription regions for adequate coverage
如作为普及性业务的语音网络，哪儿有居民居住，就必须建设语音交换局点，并对用户区域进行线缆系统的覆盖。 |
