端口数量是指打印服务器能够同时连接的打印机端口的数量，端口数量越多，可以连接的打印机越多。
得到hub上可用的US b端口数量，遍历所有端口以找到正确的Device。
Obtain the number of USB ports available on the hub, and traverse through all the ports to find the appropriate Device.
最后一个配置项增加可用的本地端口数量，这样就增加了可以同时服务的最大连接数量。
The final configuration item increases the number of local ports available for use, which increases the maximum number of connections that can be served at a time.
本发明提供了一种基于PCI总线的管脚复用的方法。该方法可以明显的减少PCI接口设备的端口数量，而且不需要大幅度增加电路的复杂度。
This invention provides a method for multiplexing pins based on PCI bus which can reduce port numbers of PCI interface equipments but does not increase complexity of adding circuits.
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