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某支局许多寻呼用户都反映收不到信息。该局维护人员立即对寻呼设备进行查修。在检查中发现无线寻呼发射机在运行过程中出现死机,发射机“C-NET”传输中断而指示灯显绿色正常,“STIVS”状态指示亮红灯告警。清市局进行远程诊断,发现传输电路有滑码现象,造成发射机的密码等参数改变,引起死机。重新输入密码等参数,又能正常运行。发射机运行一段时间后,反复出现死机。由于滑码的存在,故障未能彻底解决。是什么原因造成的滑码呢?在对传输2M电路进行市局——县局——支局分段自环测试时,各自都没有发现误码。重点检查各自的PCM设备,对市局——县局、县局——支局的PCM音频寻呼电路进行电平、频率特性和杂音等指
Many branch users in a branch report that no information has been received. Bureau maintenance personnel immediately on the paging equipment inspection. Found in the inspection radio paging transmitter crashes during operation, the transmitter “C-NET ” transmission is interrupted and the indicator is green, “STIVS ” status indicates a red light alarm. Qing City Bureau for remote diagnosis and found that the transmission circuit sliding code phenomenon, resulting in changes in the transmitter password and other parameters, causing crashes. Re-enter the password and other parameters, but also normal operation. Transmitter running for a period of time, repeated crashes. Due to the existence of slip code, the fault can not be completely solved. What is the reason for the slide code? Transmit 2M circuit in the city - County Branch - branch of the self-loop test, each did not find errors. Focus on inspection of their PCM equipment, the Council - County Board, County Office - Branch PCM audio paging circuit level, frequency characteristics and noise and other means