DTM交换器检查一下可资使用的带宽库，看看是否有足够的带宽来满足这个请求，如果满足，马上就建立连接。
The DTM switch checks its available pool of bandwidth to see if it has enough to satisfy the request and, if it does, immediately establishes a connection.
如果交换器本身可资使用的带宽不够，它就须向链路上的其他交换器请求更多带宽。
If the switch doesn't have enough of its own bandwidth available, it has to request more from other switches on the link.
如果交换器本身可资使用的带宽不够，它就须向链路上的其他交换器请求更多带宽。
If the switch doesn't have enough of its own bandwidth available, it has to request more from other switches on the link.
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