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- exchange central office 交换机总局
- The organization has a central office in York. 该组织在约克设有总部。
- Bell introduces crossbar central office switches. 贝尔实验室纵横中央局交换机问世。
- Centrex uses the telephone company's central office exchange to route internal calls back to an extension. Centrex使用电话公司的中央办公室交换机将内部电话又路由回到分机号码上。
- In a Centrex-based telephony system, the telephone company's central office acts as the telephone exchange. 在基于Centrex的电话系统中,电话公司的中央办公室是电话交换的中心。
- For example, with Centrex, the telephone exchange or telephone company's central office knows which extensions are internal. 例如,使用Centrex,电话交换机或电话公司的中央办公室将知道哪些分机是内部分机。
- They often act as the voice of Conservative Central Office. 他们通常都以保守党中央局喉舌的面目出现。
- You are far from the central office,you just slip down to a lower rate. 你离开电话局远，那么你就降到较低的速度上。
- You are far from the central office, you just slip down to a lower rate. 你离开电话局远，那么你就降到较低的速度上。
- Central office of Information (1974), Education in Britain, London: HMSO. 谢文全(1978);教育行政（下）;:华视教学部.
- He was sent to our central office to take over the new sales department. 他被分配到我们的总店去接管一个新的销售部门。
- Central office telephone equipment serving subscribers at one location on a private automatic branch exchange basis. The system allows such servicesas direct inward dialing,direct distance dialing,and console switchboards. 中央局的电话设备，以用户专用自动交换机方式为某一地区的用户服务。该系统允许直接内部拨号、长途直接拨号以及控制台交换转接等。
- Army Exchange Central Purchasing Office 陆军军人服务社总采购处
- Central office telephone equipment serving subscribers at one location on a private automatic branch exchange basis. The system allows such servicesas direct inward dialing, direct distance dialing, and console switchboards. 中央局的电话设备，以用户专用自动交换机方式为某一地区的用户服务。该系统允许直接内部拨号、长途直接拨号以及控制台交换转接等。
- SPC exchanges have accounted for 99.8% of the country central office telephone exchanges and 99.6% of long distance transmission has been digitized. 全国局用交换机程控化比重达到99.;8%25，长途传输数字化比重达到99
- Media gateways can either reside at the very edges of the public network at the customer premises or in a central office. 介质网关或是在客户办公室的公共电话网的边沿、或是在电话局内。
- The central office then sends an SS7 message to a signaling gateway in order to get access to calling and called address information. 然后，为了能访问到呼叫方和被叫方的地址信息，电话局向信令网关发一个SS7消息。
- By contrast, ISDN basic service provides symmetrical 128Kbps service within 18,000 feet of the central office. 与之相反，ISDN的基本服务在距电话局的1.;8万英尺范围内提供对称的128Kbps服务。
- In this case, a call is placed by the fax device and routed to the local central office by the PBX. 在此案例中，传真设备要了一个呼叫，并通过小交换机路由到了本地电话局。
- In this case,a call is placed by the fax device and routed to the local central office by the PBX. 在此案例中，传真设备要了一个呼叫，并通过小交换机路由到了本地电话局。
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