美国贝尔系统,五大部分组成:(1)美国电报电话公司,是贝尔系统的司令部,它领导并代表着整个贝尔系统;(2)长线部,负责贝尔系统的长距离通信业务;(3)西方电气公司,是贝尔系统的制造公司,提供通信设备和维护用料,负责工程设计和设备安装;(4)贝尔试验室,负责研究发展新通信系统、新产品和新业务;(5)22个市内电话公司,为广大用户提供日常的电话服务。在1981年底它有104万职工、1,200亿美元的资产、1.424亿部电话。它所提供的电话服务占全美国80%以上。近几年来,贝尔系统从上到下进行了机构改革,将原来的功能型机构改为面向用户的市场型机构。1983年2月24日美国法院又接引“反垄断法”作出 The Bell system in the United States consists of five major components: (1) AT & T, the Bell Systems headquarters, which leads and represents the entire Bell system; (2) the Long Line Department, which is responsible for the long- Western Electric Company, a Bell Systems manufacturing company providing communications equipment and maintenance supplies, is responsible for engineering design and equipment installation; (4) Bell Labs, responsible for researching and developing new communications systems, new products and new businesses; A city phone company, for the majority of users with daily telephone service. At the end of 1981 it had 1.04 million workers, 120 billion U.S. dollars of assets and 142.4 million calls. It provides telephone service accounting for more than 80% of the United States. In recent years, Bell system has carried on the institutional reform from top to bottom, changed the original functional organization into the market-oriented organization oriented to the user. On February 24, 1983, U.S. courts also introduced the Anti-Monopoly Law