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分析了在ISDN用户环路中 2B +D接口的同步问题、各种同步方式 ,以及关键的技术 .结合MITEL公司的基本速率芯片搭建出了 2B +D的数字接口 ,为数字调度台提供了方便可靠的数据接口 .并且已成功地应用在现场中 .
The problems of synchronization of 2B + D interface, various synchronization methods and key technologies in ISDN user loop are analyzed.The digital interface of 2B + D is built by combining the basic rate chip of MITEL Company, which provides convenience for digital dispatching station Reliable data interface. And has been successfully applied in the field.