本文在对业务需求、功能需求、数据需求和性能需求进行分析的基础上给出了系统的数据流图。
Based on the analysis of business needs, functional requirements, data demands and performance requirements this paper presents data flow diagram of the system.
文中在讨论宽带综合业务数据网（B-ISDN）网络分层模型的基础上，介绍了实现APON系统中ONT的总体方案功能模块图，并根据协议和ONT技术要求提出了通道层硬件电路设计。
The paper introduced the functional block schematic of realizing the whole ONT in APON based on the network model of B-ISDN and bring forward path layer system design according to the protocol.
包括用户的需求分析、系统的业务流程图、系统功能模块。
The analysis of user requirement, the operation flow chart, the subsystem function charts are introduced in this article.
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