最近添加到类 test adsl:IPv4/IPv6过渡时期的DSL宽带接入 - 数据通信\行业技术\技术 — C114(中国通信网)
2.1 双栈桥接接入 方案一网络拓扑如图2所示。用户端安装了双栈的DSL接入路由器。路由器可以 整合 了DSL Modem,也可以通过 以太网 连接到外部的DSL Modem。ATM PVC建立在DSL Modem和ISP的BRAS接口之间。IPv4和IPv6包根据AAL5多协议封装标准被封装成ATM信元在PVC上直接转发。每种协议只有一条PVC通道。BRAS同时连接到ISP的IPv4和IPv6骨干网中。NSP需要接入IPv4和IPv6互联网的 服务器 和核心路由器也都接入到骨干网中。DSL接入路由器需要静态地配置IPv4公网地址和IPv6地址前缀,而不能根据每个连接动态配置。 图2 双栈桥接接入方案 3.2. 2 双栈PPPoA/PPPOE接入 方案二网络拓扑如图3所示。CPE和BRAS设备的使用和桥接接入方案相同,所不同的是用户和ISP之间通过PPP动态连接,因此需要在骨干网中部署IPv4和IPv6接入所需的Radius服务器。根据接入路由器的不同,用户端和BRAS之间可以使用PPPoA或PPPoE建立连接。IPv4和IPv6连接参数保存在NSP的RADIUS数据库当中。DSL接入路由器和BAS之间只建立一条PPP链路,并在上面建立PPPv4(IPCP)和PPPv6(IPv6CP)会话。这使得IPv4和IPv6协议共用一个PPP标识。对于IPv4,BRAS和接入路由器之间建立起PPPv4会话并通过IPCP传递IPv4配置信息。对于IPv6,则通过PPPv6会话的IPv6CP实现。基于DHCPv6的地址前缀指派机制会向接入路由器分配IPv6前缀。随后这个前缀会在用户端公告,以实现IPv6终端的自动配置。 图3 双栈PPPoA/PPPoE接入方案 3.2. 3 双栈PPP/L2TP隧道接入 方案三网络拓扑如图4所示。该方案中,PPPv4和PPPv6会话在用户DSL路由器和服务供应商L2TP网络服务器(LNS)之间建立。这个双PPP会话包括两个会话:第一个会话根据DSL线路的接口通过以太网(PPPoE)或ATM(PPPoA)在接入路由器和BRAS之间建立。第二个会话通过L2TP隧道在BRAS和LNS之间建立。BRAS作为L2TP接入 集线器 (LAC)使得用户端发起的PPP会话可以转发向LNS。用户端的验证和配置参数由RADIUS服务器管理。DHCPv6应用于LNS和用户DSL路由器之间的PPPv6链路上,LNS充当DHCPv6服务器,DSL路由器充当DHCPv6客户。值得一提的是,NAP主干仍旧使用IPv4。这意味着即便与NAP之间的互连仍然采用基于IPv4的L2TP,但NSP已经可以开始提供纯IPv6服务。 图4 企业双栈PPP/L2TP隧道接入方案 3.2.
资源列表关于这个专题 test adsl:网通重庆分公司
什么是宽带上网? 宽带网在港、台地区称“宽频网路”或简称“宽频”。那么什么是宽带?其实并没有很严格的定义,一般是以目前拨号上网速率的上限 56Kbps为分界,将 56Kbps及其以下的接入称为“窄带”,之上的接入方式则归类于“宽带”。VDSL/ADSL/LAN都属于宽带,ISDN不属于宽带。 什么是ADSL?
济南网通ADSL速度测试 网通 网速 测试 山东 济南
济 南 网 通 ADSL 速 度 测 试 本中心网站测速服务器由山东省网通中心机房托管,您所测试的速度即为您本机的ADSL网速! 测速文件 : 文件一(128M) 文件二(500M) 文件三(2G) 测速方法 :请用鼠标右键以上任一文件链接,然后选中“目标另存为”,弹出连接到窗口. 在用户名中输入 test, 在密码中输入 test123. 单击确定. 弹出另存为窗口. 选择下载存放的位置后,单击“保存”即可! 随后弹出下载保存页面. 上面显示的速度即为您的网速! 注意 :用以上方法得到的速度为您的下载速度! 这和平时所说的768K、2M是不同单位的!
ADSL测试仪-北京立信伟业科技发展有限公司
支持以下标准:ITU-T G. 994、ITU-T G. 992.1 (G.dmt) - Annex A, B, C, and I、ITU-T G.
北京立信伟业
992.1 Annex A (G.DMT) ● G. 992.1 Annex B (G.DMT) ● G. 994.1 (G. Hs) ● ITU-T-I. 361, ITU-T-I. 432, ITU-T-I.
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Product -- ST330 xDSL Tester -- Senter Electronic
¡ô xDSL Test Test xDSL line and validate dialing and logon Internet. Testing items include physical layer test, Modem parameter setting, PPPoE property, PPPoE dial, network layer test(Ping, Ipconfig, Route, Tracert), loopback test, webpage browsing,and so on. ¡ô LAN Test LAN test includs netcard property, PPPoE property, PPPoE dial, network layer test (Ping, Ipconfig, Route, Tracert),webpage browsing, fixative IP scanning, Ftp Client and webpage speed test. ¡ôDMM Test Test xDSL line physical layer parameters, including loop resistance, capacitance, insulation resistance and voltage. ¡ôModem Emulation: Emulate users Modem ¡ôFile management File management includes saving records, browsing records, memory key storage and file transmission. Functions & Specifications ¡ô Test ADSL2+ Transmit parameters, also support ADSL, ADSL2 and READSL. ¡ô DSL line self-identification connection ¡ô Link and browse webpage to validate network connection. ¡ô TFT true color LCD with touch screen & Windows interface. ¡ô Support memory key, mouse and keyboard through USB port. ¡ô Can be used as ADSL2+ Modem.
LabWindows/CVI确保高质量ADSL Modem产品的生产 - OfficeInfo - Asia/Pacific - National Instruments
我们先前用的是一套基于UNIX的带有内置控制器的测试系统测试ADSL。在换用NI Test Executive后,并结合使用LabWindowsä/CVI和Windows系统的GPIB控制器,我们制造了一种高速、方便用户使用的ADSL测试仪。它能够同时测试多个modem。这个IMPACT测试系统还用到一个基于VXI的ADSL测试头,测试头包含一个物理层测试模块,一个数据通信(datacom)测试模块,以及一个可选的POTS模块... "使用NI的Test Executive,并结合LabWindowsä/CVI和Windows的GPIB控制器,我们制造了一种高速的、方便用户使用的ADSL测试仪,它能够同时测试多个modem。" 注: 所有文章下载后需用 Adobe Acrobat Reader (5.0或更高版本)浏览
单网卡ADSL共享上网的设置 - 组网技术 - NB技术网|Powered By NB文章系统(NBArticle)
如果使用WINDOWS2000的共享连接,服务器的IP地址会被硬性设置成:192.168. 0.1。 设置好后,在DOS 窗口下用 Ping 192.168.
最常见的5个网站,在类别 Internet:Grand Element Digital Ltd.[print,Terminals,Embedded System,Banking and Finance]
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JW54P, Justec Wireless-G PCI Adapter, installs in most desktops and lets you put your computer almost anywhere without the boundary of troublesome cabling. Once you're connected, you can serf the web, and enjoy all internet services with up to 128-bit Encryption Security Protection. Convenient, fast, and cost-effective choice! The data transfer rate reaches incredible 54Mbps! JW54P is fully compliant with IEEE 802.11g standards, and runs 5 times faster than 802.11b. However, it is still compliant with existing 802.11b standard equipment.
Enfora | Enfora announces Wireless Portfolio Club site
Enfora announces Wireless Portfolio Club site Enfora, Inc. , a leader in wireless data solutions, today announced the Wireless Portfolio Club Internet site (www.wp-club.com). The site was co-developed by Wireless System Integration AB (WSI) based in Stockholm Sweden. Designed to function with virtually any PDA, the Wireless Portfolio provides all the necessary functionality to connect the user to a variety of wireless data networks through its unique architecture. According to Loren Anderson, Sr. Director for GPRS Market Development, "We are enabling a community of users, application developers, resellers, and distributors. The WP Club site provides access to up-to-date information, solutions, and ideas for this innovative device that enables mobile connectivity. The site will be updated soon to include the recently announced WiFi version of the Wireless Portfolio" The wp-club site is organized to support the user and the developer/reseller community. In addition to Enfora software updates, independently developed applications will be posted on the site along with white papers and case studies. FAQs and press reviews are available as well as email links for support questions. "
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