1·DQDB link layer model was adopted in data lineate transmission.
数据有线传输采用DQDB“链路层”模型。
2·IP camera is a kind of camera that can product and transmit digital video stream via lineate or wireless network, but there is a few of cases of it's application in China.
网络摄像机是一种可产生数字视频流并将视频流通过有线或无线网络进行传输的摄像机，但在中国还应用较少。