Tunneling (RFC 2893) : it allows you to encapsulate one packet head into the other and one protocol will communicate with others through the encapsulation in the other protocol.
隧道技术(RFC 2893)：是指将一种协议报头封装在另一种协议报头中，这样，一种协议就可以通过另一种协议的封装进行通信。
We can look OBS network as two networks, one is transparent optical network for transmitting data burst; the other is optical and electronic hybrid control network for transmitting burst head packet.
OBS网络可以看作两个网络的重叠：传送数据突发的纯光网络和传送突发头分组的光电混合控制网络。
The concept of UCL, the configuration of large scale parallel broadcast system, data packet format and UCL in-formation packet format in the head-end system are described in this paper.
简要介绍了UCL的概念和大规模并播系统的组成、前端的数据包格式和UCL信息包格式；讲解了数据接收端的软件设计方案和各个模块的功能；并概括地描述了UCL的应用前景。
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