一种网络服务请求单元，由系统服务控制点(SSCP)送到逻辑单元(LU)，通知该逻辑单元所请求过程的状态。
A network services request unit that is sent by a system services control point (SSCP) to a logical unit (LU) to inform the LU of the status of a procedure requested by the LU.
网络控制的概念被扩展到了让数字交换机与数据库（称为服务控制点）和信号处理系统（智能外设）通信。
The concept of network control was extended to let digital switches communicate with databases (known as Service Control Points) and signal processing systems (Intelligent Peripherals).
不走向“至尊魔戒”之路的一个方法是，识别出不同的控制点——拥有不同的子系统，基于多个供应商而非一个供应商来建立服务。
One way to do this is to identify the various points of control, who owns the various subsystems, and build services that rely on multiple providers rather than just one.
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