业务支撑网核心域有大量的网络设备、主机系统和应用系统，分别属于不同的业务系统。
The core domain of business support network has a large number of network devices, host systems and applications, which belong to different systems in different business systems.
无论是传送网、业务网、支撑网还是信息网，都可以根据这一理论分层和分割。
No matter it is transmission network, service network, supporting network or information network, any network could be layered and segmented according to this theory.
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