EPON系统E1业务实现方案  

Implementation of E1 Service in EPON System

作　　者：赫伟[1,2] 孙应飞[3] 

机构地区：[1]中国科学院研究生院工程教育学院,北京100049 [2]中国联合网络通信有限公司北京市分公司,北京100800 [3]中国科学院研究生院信息科学与工程学院,北京100049

出　　处：《通信技术》2010年第3期174-176,共3页Communications Technology

摘　　要：在EPON系统中传输数字电路E1业务,满足在分组交换中应用电路交换业务的需求。提出E1数据的封装方法和周期,并在E1封装帧中加入时钟标签实现OLT和ONU的业务同步定时,采用多LLID的EPON系统DBA对TDM业务传输带宽进行保证,从而满足了TDM业务对延时抖动、时钟同步等的严格要求。并采用传输仪表对设计的模块进行功能测试验证。结果表明可以达到设计规范要求。To realize E1 service over EPON systems,it means to satisfy the requirement of applying the circuit switch in the packet switch.The E1 data encapsulated methods and period are proposed.The Time-Stamp is inserted into the E1 frames,thus to obtain the synchronization of OLT and ONU.The multiple logical link identification （LLID） technology is adopted in the Dynamic Bandwidth Arithmetic （DBA） to guarantee TDM service transmit bandwidth.In this way,the strict requirements of TDM are satisfied,including in delay jitter,clock synchronization and so on.Finally,the functions of the designed module are tested and verified with transmit test instrument,and the test result indicates that the designed module is up to the design specification.

关 键 词：以太无源光网络 一次群 时钟同步 逻辑链路标识 

分 类 号：TN91[电子电信—通信与信息系统]