| 1. | A new feature of northern telecom ' s central offices
北电公司市话局的一个新功能。 |
| 2. | 5 x - bar central office equipment
5根交叉横木市话局设备。 |
| 3. | Digital line signalling for manual toll exchange to local exchange
人工长途电话局至市话局局间中继数字型线路信号 |
| 4. | Very small local exchange vsle
很小容量市话局 |
| 5. | Centered operation and maintenance system project for the local exchanges in datong telecom bureau , shanxi province
大同市电信局市话局的集中操作维护中心的安装开通工程。 |
| 6. | Central office prefix numbers used to access a wide variety of information services . 555 numbers are in the format 555 - xxxx
市话局的前缀数字，用来访问更为丰富的信息业务。 |
| 7. | Automatic line insulation testing . equipment located in a central office which sequentially tests lines in the office for battery crosses and grounds
自动线路绝缘测试。放置在市话局的设备，对市话局的线路进行线路交叉测试和对地测试。 |
| 8. | Automatic coin telephone service includes a telephone company central office that can complete all types of payphone calls automatically without an operator
自动投币电话业务，包括电话公司市话局，可以不需要话务员而自动完成各种类型的公用电话。 |
| 9. | A digital central office switching system made by lucent . it is typically used as an " tandem switching office , switching long distance phone calls . see 5ess
朗讯公司生产的一种数字市话局交换系统。通常作为一种汇接交换局，转接长途电话。参见5ess 。 |
