本文分析了多优先级DQDB城域网的性能，得到了采用不同优先级时，报文平均停留时间的表达式。
The performances of DQDB man with multiple priorities are analyzed. The expressions of mean message sojourn time in the buffer are derived.
本文介绍了802.16系列标准与规范的制定过程， 比较了802.16和802.11在技术特点和市场定位方面的不同，并分析了无线宽带城域网产品未来的市场发展前景。
The evolution of IEEE 802.16 standards are introduced, and the differences between 802.16 and 802.11, as well as the prospective of related products, are analyzed.
对当前城域网的业务需求进行了分析，提出四类城域网建设解决方案。
Service requirements in the current MAN are analyzed. Four kinds of solutions for the construction of MAN are put forward.
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