江西:光纤宽带进楼入户4K高清全民普及

谈起“通信改变生活”,记者从新闻报道层面感触最多的就是宽带网络“提速降费”:2013年国务院印发“宽带中国”实施方案,提出2015年城市和农村家庭宽带接入能力基本达到20Mbit/s和4Mbit/s、部分发达城市达到100Mbit/s,2020年分别提高到50Mbit/s、12Mbit/s和1Gbit/s.     

网通电信宽带新策略的背后

北京网通计划在5.17电信日推出2Mbit/s带宽ADSL服务,包月费用暂定为180元左右。同时,网通全国子公司均已经开始进行ADSL提速的准备工作,提速后的ADSL网速可望从目前主流的512kbit/s和1Mbit/s提高到2Mbit/s～8Mbit/s,最快提升8倍。     

多载波HSPA＋部署量猛增 不同制式网络差距拉大

在LTE大势下,HSPA＋在提升移动宽带用户体验上仍有巨大的空间。MIMO（多输入输出）、双载波的应用使HSPA＋历经了21Mbit/s、28Mbit/s、42Mbit/s,产业链在21 Mbit/s HSPA＋引入了下行64QAM高阶调制技术、在28Mbit/s阶段引入了MIMO技术后,爱立信、华为、中兴、诺基亚西门子通信等占据HSPA＋市场主要份额的设备巨头又在42Mbit/s阶段则引入了DC（双载波）技术,实现了84Mbit/s这一峰值速率,甚至以四载波方式将HSPA＋带入了112Mbit/s这一历史新高度,明显提升了HSPA＋网络在体系吞吐量、单用户体验、频谱利用率等方面的性能。随之迅速增长的,是今年前三季度的全球运营商双载波HSPA＋网络数量。     

基于MSAP/MSTP的EoE技术应用方案

1 技术提出的背景 随着MSTP技术的出现,利用EoS技术在传统SDH传输网上提供以太网专线成为现实.4 Mbit/s、8 Mbit/s、10 Mbit/s、50 Mbit/s甚至100 Mbit/s的带宽租用粒度很容易实现,但利用EoS技术提供以太网专线,运营商需要升级以前配置的SDH设备为MSTP,并在MSTP上配置以太网数据板,这样做的成本相对很高.     

交换式集线器及其在Novell网中的应用

交换式集线器通过对网络的分段提高信息流量 ,对于 10台相同PC共享 10Mbit/s的网络连接 ,一个十端口的交换式集线器可为 10台PC分别提供独占的 10Mbit/s的速率 ,而不是平均每台 1Mbit/s。除了 10Mbit/s端口外 ,每个交换式集线器还有两个高速以太端口 ,用以实现与主干网络或服务器 10 0Mbit/s的高流量信息交换连接 ,从而增加了带宽。     

MSTP技术在城域传输网中的应用

1城域传输网现状按照业务的流量、流向来划分,中国电信目前的城域传输网可分为中继层和接入层,接入层又可细分为主干层和用户层。其中,中继层以2.5Gbit/s和10Gbit/s的SDH环网为主,设备主要提供2Mbit/s和155Mbit/s接口;接入层的主干层以622Mbit/s和155Mbit/s的SDH环网为主,设备主要提供2Mbit/s接口。网络各层之间主要以2Mbit/s颗粒进行连接、调度。城域传输网主要通过如下两种方式承载数据业务:一是将数据业务电路直接承载在光缆网上,以星型方式为主组网;二是对速率的要求不高时,可将数据业务电路转换为2Mbit/s电路进行连接。现行城域…     

北京电信网155 Mbit/s信号时隙编号统一规则

介绍了北京电信网155Mbit/s信号时隙编号统一问题产生的原因，探讨了北京电信网155Mbit/s信号时隙编号统一原则，并论述了北京电信传输网、交换网155Mbit/s信号时隙编号统一策略。     

亚洲电信澳洲电信启动LTE商用服务

近日,澳洲电信启动了LTE/4G商用网络服务,并率先面向全国30多个地区市场推出。通过澳洲电信近日发售的USB 4G移动调制解调器,用户可以获得2Mbit/s到40Mbit/s的下行带宽,1Mbit/s到10Mbit/s的上行带宽。澳洲电信CEO David Thodey表示,为满足用户需求,澳洲电信将于明年上半年推出4G智能手机和平板电脑新品,首批终端将由     

烽火网络大客户专网综合接入全程网管方案

1背景目前对于集团客户的网络互联及数据需求各大电信运营商一般采用2Mbit/s的方式,SDH网络经过近多年的发展,已经形成了一个覆盖全市、区所有乡镇,全面提供2Mbit/s速率接入的完整网络。但是,随着用户对带宽需求的不断提高以及市场竞争的不断加剧,以2Mbit/s甚至N×2Mbit/s、100     

要闻·国际

英国宽带平均网速升至9Mbit/s英国电信监管机构Ofcom近日发布的研究报告显示,2012年5月英国宽带平均速度达到9Mbit/s,而2011年11月的宽带平均速度为7.6Mbit/s。速度增长的主要原因是由于各大运营商推出了新的"超高速"宽带服务,如维珍传媒(Virgin Media)推出速度为60Mbit/s的宽带服务、英国电信推     

Transmission experiments through 101 km and 84 km of single-mode fibre at 274 Mbit/s and 420 Mbit/s

Four transmission experiments through low-loss single-mode optical fibre at 1.3 ?m have been performed at 274 Mbit/s and 420 Mbit/s with different objectives. The first demonstrates transmission through 101 km of single-mode fibre at 274 Mbit/s with negligible dispersion penalty. The second experiment at 274 Mbit/s and 84 km uses only components suitable for use in an undersea cable system. Two additional experiments, both at 420 Mbit/s, accomplish a bitrate × distance product of 35 GHzkm with 84 km of fibre and show no dispersion penalty with 63 km and 2.4 ps/km nm dispersion.     

PDH信号载入SDH系统（Ⅰ）

针对ＰＤＨ与ＳＤＨ的兼容问题，简述了ＳＤＨ的信息结构，并分别介绍了１４０Ｍｂｉｔ／ｓ、３４Ｍｂｉｔ／ｓ、２Ｍｂｉｔ／ｓ信号载入ＳＤＨ系统的过程。     

Reconfigurable design and implementation of the MD6 Hash function

Efficient reconfigurable field programmable gate array (FPGA) architectures for the MD6-224/256/384/512 Hash algorithm are proposed in this article. The basic iterative compact design requires 923 ALMs and achieves a throughput ranging from 225 Mbit/s to 394 Mbit/s at a maximum frequency of 198 MHz. The 32-step-unrolled high-throughput design requires 7 090 ALMs and achieves a throughput ranges from 5 776 Mbit/s to 9 490 Mbit/s at a maximum frequency of 173 MHz. The simulation results show that high flexibility and efficient FPGA implementation of the MD6 Hash function is achieved.     

用TMS320C50实现2Mbit／s七号信令链路控制终端

目前的七号信令网基本上基于６４ｋｂｉｔ／ｓ的信令链路、随着移动,智能等电信新业务的逐渐引入,信令业务负荷不断增大,因而有必要在信令网中引入２Ｍｂｉｔ／ｓ的高速七号信令链路。本文在概要介绍２Ｍｂｉｔ／ｓ七号信令协信的基础上,介绍了一种基于ＴＭＳ３２０Ｃ５０的２Ｍｂｉｔ／ｓ信令链路控制终端的设计,并给出了设计中Ｃ５０编程的一些方法和技巧。     

Novel high-speed LED transmitter for single-mode fibre and wideband loop transmission systems

A new high-speed LED transmitter using novel GaAs MESFET bias and drive circuits has been developed. It can modulate LEDs beyond 560Mbit/s with up to 200 mA drive current. At 560Mbit/s, extinction ratios of 15 dB were attained with devices that otherwise operated up to 250Mbit/s. The transmitter was designed for single-mode loop applications.     

1.3 ?m bidirectional optical transmission over 31 km of installed single-mode fibre using optical couplers

Results are reported of 1.3 ?m bidirectional optical transmission over 31 km of installed cabled fibre at transmission rates of 34?650 Mbit/s using fused biconical tapered couplers manufactured at BTRL. With the introduction of 6 dB extra path loss it is possible to double the system capacity incurring only a small additional penalty at 34 and 140 Mbit/s and no other penalty at 320 and 650 Mbit/s.     

Component codec standards for high-quality digital television

Work towards defining standards for digital television transmission codecs has been proceeding for many years. A draft specification for 140 Mbit/s coding using blanking removal and differential pulse code modulation is given in CCIR Recommendation 721. A draft specification for a codec operating at 30-45 Mbit/s and using the discrete cosine transform has been defined by the European Telecommunications Standards Institute. The author briefly reviews bit-rate-reduction techniques and describes the 140 and 34 Mbit/s codecs     

Measurement and prediction of digital radio performance on a long overwater path

The simultaneous field trial performance of 34 Mbit/s 4PSK, 2 × 34 Mbit/s 8PSK and 4 × 34 Mbit/s 16QAM digital radio systems over a 158 km overwater path in Australia is reported, and the measured outage performance is then used to derive propagation data, which in turn is used to predict performance using quadruple diversity. In addition, a generalised outage prediction technique is derived for n diversity.     

Implementing block ciphering algorithms in hardware

Many ciphering algorithms map efficiently into hardware, giving encryption with very high throughput. Hardware designs are presented for two secretkey block ciphers, Blowfish and REDOC III. Pipelined systems using arrays of programmable logic and RAM offer encryption rates of 1032 Mbit/s and 1640 Mbit/s, respectively.