在都市中实现有线局域网间互联的费用是非常昂贵的。为了在被道路分隔开的两座建筑物之间布线，用户必须进行勘测、挖掘管道（以及阻碍交通） 、重新铺路或租用每月付费 无线网桥-In the city wired LAN Interconnection costs are very expensive. In order to be separated from the road route between the two buildings, the user must carry out the