本文主要對155M POS 線路接口的設計與實現問題進行了研究，在IP 傳輸排隊模型的
基礎上，對HDLC 和SDL 兩種鏈路層協議處理PPP 數據包的性能進行了分析和比較，給出了整個155M POS 線路接口硬件系統的設計方案及各子模塊的功能劃分，提出了輸入和輸出鏈路控制電路設計中的調度和緩存器管理策略，實現了整個系統硬件功能。
關鍵詞: POS SDL HDLC 核心路由器 線路接口
Abstract: This paper is devoted to the research and implementation of 155M POS interface. Based on the research of queue model of IP transmission, performances of PPP frame processed by HDLC and SDL are analysed and compared. Then the hardware design of 155M POS interface and functional modules of the whole system are given. Furthermore, policies of scheduling and? buffer management in the design of in-out link control circuit are proposed. In the end, the implementation of hardware system is given and the design of software system is briefly introduced.
Keyword: POS SDL HDLC CR(core router) Interface