| " str=str+"PDH、SDH光端机" str=str + " |
| " str=str+"接口转换器" str=str + " |
| " str=str+"光电转换器" str=str + " |
| " str=str+"PCM综合复用设备" str=str + " |
| " str=str+"视频监控传输设备" str=str + " |
| " str=str+"工业电力传输设备" str=str + " |
| " str=str+"铜线传输设备" str=str + " |
| " str=str+"光纤网卡及配件" str=str + " |
| " str=str+"TDM over IP设备" str=str + " |