| 1. | The resolution scheme for the noise interference and the congestion of hfc upstream channel
网上行信道噪声干扰与通道拥塞的解决方案 |
| 2. | So the upstream channel has the character of narrower bandwidth and bigger noise . this character has a big influence on data transmission on the upstream channels
因此，上行信道具有频带窄，噪声大的特征，这一特征对上行信道的数据传输具有极大的影响。 |
| 3. | As media - shared network , apon needs some form of media access control ( mac ) protocol to arbitrate the upstream channel among terminations , and avoid collisions
作为介质共享的树形网络， apon需要介质访问控制协议( mac )协调各终端对上行信道的访问，避免冲突。 |
| 4. | Based on analyzing the upstream channel ' s description in the docsis protocol , the author profoundly explored the upstream channel ' s bandwidth allocation algorithm in the hfc network
在对docsis协议中上行信道描述部分的分析基础上，对上行信道的带宽分配算法进行了深入的研究。 |
| 5. | Therefore to solve the noises in the upstream channel and to share the sources of the upstream channels becomes one of the key technologies for hfc system to become a multimedia communication platform
因此，解决上行信道的噪声问题和上行资源共享是hfc网络能否成为一个多媒体业务通信平台的关键技术之一。 |
| 6. | To make itself compatible the transmission mode of the conventional catv system , the bandwidth of hfc system is divided into many 8mhz channels , which include downstream and upstream channels
为了兼容传统的有线电视传输模式， hfc网络带宽首先被频分为若干个8mhz的频道，这些频道被统一划分为下行和上行信道。 |
| 7. | The new scheme has a lot of advantages such as resolving " the funnel noise " in the upstream channel , high speed and low cost of building , which is likely to become an important broadband access network
这种新型的hfc宽带接入网具有抗“漏斗噪声”的能力强、传输速率高及建设费用低等优点，有可能发展成为一种重要的宽带接入网。 |
| 8. | The concept of the qos appears in the docsis v1 . 1 . both ieee802 . 14 and docsis , focus in mac protocol design on the upstream channels , i . e . sharing the upstream channels , dealing the services and resolving the contention
无论是ieee802 . 14还是docsis两者mac层协议的设计重点都放在上行信道上，即上行信道的分配，服务调度以及冲突解决等。 |
| 9. | While scouring appeared at the left bank of upstream channel with distance between 10 to 20 meters for dam no . 4 , serious scouring was also discovered at the left bank of upstream channel with distance between 5 to 10 meters for dam no . 3
当四号坝坝体拆除缺口初期，以四号坝上游左岸10至20公尺范围内与三号坝上游左岸5至10公尺冲刷情况较严重。 |
| 10. | Due to its particular mixed topology of star and branch as well as its asymmetric upstream and downstream , the upstream channel ' s bandwidth allocation algorithm in hfc network has been a research hotspot domestic and abroad
由于hfc网络特有的星型与树枝型相混合的拓扑结构以及它的上下行非对称特性，使得hfc网络中上行带宽分配算法的研究成为了国际国内研究的热点。 |
