| 1. | Study and design of the nat are very important to applications . the advantages and disadvantages of the nat in wideband metropolitan area network ( man ) are discussed in this paper
本论文讨论了在宽带城域网中实现地址复用思想的nat设备的优缺点，详细分析了在宽带中nat方案的实现原理，设计方案和发展方向。 |
| 2. | Resilient packet ring ( rpr ) is a new solution method to metropolitan area network ( man ) . ieee802 . 17 working group is developing the rpr standard as a mac . layer protocol independent of physical layer
弹性分组环( resilientpacketring ， rpr )是近年来出现的一种城域骨干网技术， ieee802 . 17工作组正在进行弹性分组环的标准化工作。 |
| 3. | Nowadays , the metropolitan area network ( man ) and its technology are developed rapidly as the result of the great development of data service . sdh is used widely in the mans owing to its flexibility networking , perfect protection and powerful administration
Sdh以其灵活的组网能力，完善的保护机制，强大的管理功能以及良好的扩展能力在传输网中的到了广泛的应用。 |
| 4. | Network solutions provider dmx , in which the group holds a 51 % interest , concluded contracts to build the metropolitan area networks ( mans ) for suzhou catv and the gansu and ningbo branches of china telecom
集团持有网络方案供应商dmxtechnologies51 %权益。该公司于本年度上半年为苏州有线电视及中国电信甘肃及宁波分区建立城市区域网络（ metropolitanareanetworks , mans ） 。 |
| 5. | New standards from ieee brings not only the full support on criterion but also the improvement on the ethernet technology , endues it with virtues such as easy to use , low cost of price and high - speed etc . ethernet has entered the domain of metropolitan area network ( man ) and wide area lan ( wan )
以太网开始进入城域网man和广域网wan领域。目前， g位以太网已经成为宽带ip城域网的首选方案，也已经开始用于并将广泛用于man和wan 。随着千兆以太网技术的继续发展，对网络管理的要求也相应增加。 |
