对开放系统互联参考模型和TCP/IP协议分层体系结构进行了分析，论证了所采用方法的可行性。
The Reference Model of Open Systems Interconnection and TCP/IP Protocol System are also analyzed in this paper, which prove the feasibility of this method.
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.
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