共查询到20条相似文献,搜索用时 46 毫秒
1.
在电信市场需求和通信技术发展的双重驱动下,光传输设备这些年也得到了长足的发展。值得注意的是.在SDH设备不断进步的同时,PDH的设备并没有像人们预期的那样逐步退出“舞台”.相反PDH设备也在发展.产品的集成度、稳定性、多功能等方面都达到了一个新的水平。 相似文献
2.
3.
文章介绍了用RC1 44D芯片设计调制解调器的方法 ,并给出了排版、调试要点 ,最后对该芯片在模拟蜂窝网络的应用作了简单介绍。 相似文献
4.
万兆以太网交换芯片设计技术 总被引:1,自引:0,他引:1
中国以IP为核心的宽带城域网建设正处于高峰阶段,给10G以太网为核心的城域以太网解决方案提供巨大的应用舞台.为了满足中国数据通信市场的需求.中兴通讯研制了10GE以太网产品.文章对这一产品进行了介绍,对其核心芯片--10GE交换芯片进行了分析,给出了芯片的功能、关键技术及芯片功能. 相似文献
5.
6.
网络控制器芯片的功能与设计实现 IEEE802.3协议是针对以太网CSMA/CD标准的传输介质物理层(PHY)和介质访问控制协议(MAC、MediaAccessContr01)来定义的。芯片由PHY、发送模块、接收模块、FIFO、控制模块组成,其中控制模块包括寄存器堆、DMA(Direct Memory Access)模块、流量控制模块、接收缓冲区和发送缓冲区组成。网络控制器芯片的功能框图如图1所示。 相似文献
7.
8.
9.
10.
基于CSoC芯片的嵌入式以太网接口设计 总被引:4,自引:0,他引:4
文章介绍了Triscend公司的CSoC(可配置片上系统 )芯片TE5 0 2为基础的嵌入式系统与10M以太网控制器芯片RTL80 19AS的硬件接口电路的实现和编程方法。该系统不仅性能高且价格便宜 ,具有良好的发展前景。 相似文献
11.
Proposed and experimentally demonstrated is a novel self-protected architecture for Ethernet passive optical networks. The protection of the traffic transported between the central office and customer terminals against feeder fibre cable breaks is carried out by switching and overlaying the disrupted transmission channels onto a separate Ethernet passive optical network using waveband separation. 相似文献
12.
文章简单介绍了光以太网网络安全的基本技术,根据光以太网的特性分析了其物理安全隐患及可采取的防御措施,并对光以太网中数据的信息安全进行了分析,探讨了采用身份认证和信息加密方法加强信息安全性的具体实现策略. 相似文献
13.
WDM Ethernet passive optical networks 总被引:1,自引:0,他引:1
WDM EPONs not only allow for cautious pay-as-you-grow upgrades of single-channel TDM EPONs but also avoid linearly increasing polling cycle times for an increasing number of ONUS. In this article, we first provide a comprehensive overview of the state of the art of TDM EPONs and recently reported dynamic bandwidth allocation algorithms, including decentralized scheduling schemes. After reviewing previous work on WDM EPONs, we address the requirements of WDM upgraded EPONs and make recommendations on an evolutionary WDM upgrade at the architecture, protocol, and dynamic bandwidth allocation algorithm levels, taking backward compatibility with MPCP and future-proofness against arbitrary WDM ONU structures into account. We describe and compare online and offline scheduling paradigms for WDM EPONs. Our simulation results indicate that online scheduling can achieve lower delays, especially at high loads. We outline areas of future research on WDM EPONs. 相似文献
14.
15.
光纤以太网网是指在光纤上运行以太网局域网(LAN)数据包接入服务的网络,底层连接可以以任何标准的以太网速度运行,包括10Mbit/s、100Mbit/s、1Gbit/s或10Gbit/s。光纤以及网把以太网技术扩展到LAN之外,进入城域网(MAN)。光纤以太网也将以太网的优越性扩展到了MAN,大大降低了运营商的网络建设成本。 相似文献
16.
RC7216是Raycom公司为实现4路E1线路传输以太网数据而设计的专用集成电路.其设计以RC7216为核心,配以少量的外围元件,通过1~4条E1线路点对点传输10 M/100 M以太网MAC帧数据来实现,并且允许E1线路之间存在一定延迟.介绍了RC7216网桥的硬件结构、工作原理及其应用. 相似文献
17.
A key feature of Carrier Ethernet networks is its operation and management framework. The link state, in this context, is
simply determined by the detection (or absence for a given period) of continuity check message (CCM) at the receiver end of
a management end point. However, cross-layer information can be inexpensively gained by looking into the loss patterns of
these CCM frames, especially when Carrier Ethernet is operating directly over wavelengths (Layer-1) from transparent optical
links or networks. This paper experimentally demonstrates a case for optical signal-to-noise and optical signal-to-interference
estimation from monitoring standard CCM frame loss frame rate. Moreover, the loss pattern signatures of such physical-layer
impairments may give in-depth link state information for fault and performance management as it may give valuable clues about
the dominant impairing phenomena. 相似文献
18.
19.
20.
Yield and cost model for integrated optical chips 总被引:1,自引:0,他引:1
A yield and cost model for integrated optical chips is presented on the basis of easily attainable figures. It allows a prediction to be made of yield and cost for complex optical chips on the basis of currently available processing technology. Both yield and cost area of calculated in absolute terms but in comparison with a simple reference chip from the production line. The model can already be applied when a chip is at an early phase of development, i.e., at the planning stage 相似文献