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根据CCITT有关ISDN用户——网络接口数椐链路层的建议Q.921(蓝皮书),对ISDND通路的链路接入规程(LAPD)进行了研究,并给出了一种相对简单的网络侧LAPD的实现方法。
Based on CCITT Recommendation Q.921 (Blue Book) on the Number of ISDN User-Network Interfaces and Link Layers, the Link Access Protocol (LAPD) for the ISDND path is studied and a relatively simple network-side LAPD implementation.