Tunneling (RFC 2893) : it allows you to encapsulate one packethead into the other and one protocol will communicate with others through the encapsulation in the other protocol.
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 headpacket.
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。
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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.