1.
SPC digital toll exchange
程控数字长途电话交换机
2.
Technical requirements of digital SPC automatic telephone exchange
GB/T15542-1993数字程控自动电话交换机技术要求
3.
automatic toll switching system
长途电话自动交换机
4.
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%，长途传输数字化比重达到99.6%；
5.
Code for design of railway SPC digital switching engineering
铁路时分数字程控电话交换工程设计规范
6.
Generic specification for stored program control digital private automatic branch telephone exchange system
GB/T14381-1993程控数字用户自动电话交换机通用技术条件
7.
The total length of long-distance optical cable installed increased by 27,000 sheath km, that of digital microwave links by 14,400 km, and the number of telephone lines by 19.61 million.
新增长途光缆27000皮长公里，数字微波干线14400公里，电话交换机容量1961万门。
8.
Design of the Small Digital Program Controlled Exchange Used in Electric Power Communication;
电力通信用小型数字程控交换机的设计
9.
At the telephone company end, ISDN lines connect to a digital switch.
在电话局一端，ISDN线连到数字交换机。
10.
Temporary regulation for test of anti-seismic performances of digital program control switching equipment
数字程控电话交换设备抗地震性能检测暂行规定
11.
electronically controlled telephone exchange
电子控制电话交换机
12.
Supervise telecom exchanger& desk phone installation.
监督程控交换机和桌上电话的安装.
13.
The Real-time Calculable System among Long-range Telephone on Computer and Exchange;
微机与程控交换机实现远程多门电话实时计费
14.
Development of Phone Accounting System for PBX;
用户程控电话交换机通用计费程序的设计
15.
Multimedia Communications in Digital SPC Exchanges and Private Networks
数字程控交换机与专网中的多媒体通信
16.
Research and Realization of Shipborne Digital Programme-controlled Telephone Switching Board Based on the CAN Bus
基于CAN总线船用数字程控交换机的实现研究
17.
Realization of Call Restricting of S1240 SPC Digital Exchanger
S1240程控数字交换机呼叫限制功能的实现
18.
SPC telex exchange
程控用户电报交换机