Last Mile” Bandwidth Availability
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Digital Subscriber Line (DSL) Technologies
CHAPTER21 Chapter Goals • Identify and discuss different types of digital subscriber line (DSL) technologies. • Discuss the benefits of using xDSL technologies. • Explain how ASDL works. • Explain the basic concepts of signaling and modulation. • Discuss additional DSL technologies (SDSL, HDSL, HDSL-2, G.SHDSL, IDSL, and VDSL). Digital Subscriber Line Introduction Digital Subscriber Line (DSL) technology is a modem technology that uses existing twisted-pair telephone lines to transport high-bandwidth data, such as multimedia and video, to service subscribers. The term xDSL covers a number of similar yet competing forms of DSL technologies, including ADSL, SDSL, HDSL, HDSL-2, G.SHDL, IDSL, and VDSL. xDSL is drawing significant attention from implementers and service providers because it promises to deliver high-bandwidth data rates to dispersed locations with relatively small changes to the existing telco infrastructure. xDSL services are dedicated, point-to-point, public network access over twisted-pair copper wire on the local loop (last mile) between a network service provider’s (NSP) central office and the customer site, or on local loops created either intrabuilding or intracampus. Currently, most DSL deployments are ADSL, mainly delivered to residential customers. This chapter focus mainly on defining ADSL. Asymmetric Digital Subscriber Line Asymmetric Digital Subscriber Line (ADSL) technology is asymmetric. It allows more bandwidth downstream—from an NSP’s central office to the customer site—than upstream from the subscriber to the central office. This asymmetry, combined with always-on access (which eliminates call setup), makes ADSL ideal for Internet/intranet surfing, video-on-demand, and remote LAN access. Users of these applications typically download much more information than they send. -
Last-Mile Guide
LAST-MILE GUIDE Leveraging KentuckyWired for local broadband deployment Phone: 606-677-6000 Address: Email: [email protected] 2292 South Highway 27 Web: www.centertech.com Suite 300 Social Media: facebook.com/CRDbroadband Somerset, KY 42501 This Page Intentionally Left Blank The Center for Rural Development’s Fiber Infrastructure Project - Phase 3 is funded by grant KY-18984-17 from the Appalachian Regional Commission and is administered by The Center for Rural Development. Page 3 of 20 OVERVIEW The Last-Mile Action team was formed to help your community with the task of solving the “Last- Mile” dilemma that faces most of rural America. The team was created as a partnership between The Center for Rural Development, which works to positively impact the communities within 45 counties of Southern and Eastern Kentucky, and SOAR, part of whose mission it is to enhance opportunity and innovation in Appalachian Kentucky. The last-mile is the final bit of fiber optic cable, copper wire or radio transmission that goes from a home, business, school or hospital and connects into the “middle-mile” infrastructure. The middle-mile is typically an intra-state web of high-speed, high-capacity fiber optic cable that consolidates thousands of last-mile connections and gets them access to the national tier 1 internet providers. There have been numerous discussions with telecommunications providers over the years regarding improving service and widening availability of broadband access, but little to no improvement had taken place until the KentuckyWired initiative. The fiber infrastructure that exists in the service area is dated and is being used, for the most part, at capacity. -
A Technology Comparison Adopting Ultra-Wideband for Memsen’S File Sharing and Wireless Marketing Platform
A Technology Comparison Adopting Ultra-Wideband for Memsen’s file sharing and wireless marketing platform What is Ultra-Wideband Technology? Memsen Corporation 1 of 8 • Ultra-Wideband is a proposed standard for short-range wireless communications that aims to replace Bluetooth technology in near future. • It is an ideal solution for wireless connectivity in the range of 10 to 20 meters between consumer electronics (CE), mobile devices, and PC peripheral devices which provides very high data-rate while consuming very little battery power. It offers the best solution for bandwidth, cost, power consumption, and physical size requirements for next generation consumer electronic devices. • UWB radios can use frequencies from 3.1 GHz to 10.6 GHz, a band more than 7 GHz wide. Each radio channel can have a bandwidth of more than 500 MHz depending upon its center frequency. Due to such a large signal bandwidth, FCC has put severe broadcast power restrictions. By doing so UWB devices can make use of extremely wide frequency band while emitting very less amount of energy to get detected by other narrower band devices. Hence, a UWB device signal can not interfere with other narrower band device signals and because of this reason a UWB device can co-exist with other wireless devices. • UWB is considered as Wireless USB – replacement of standard USB and fire wire (IEEE 1394) solutions due to its higher data-rate compared to USB and fire wire. • UWB signals can co-exists with other short/large range wireless communications signals due to its own nature of being detected as noise to other signals. -
Lecture 8: Overview of Computer Networking Roadmap
Lecture 8: Overview of Computer Networking Slides adapted from those of Computer Networking: A Top Down Approach, 5th edition. Jim Kurose, Keith Ross, Addison-Wesley, April 2009. Roadmap ! what’s the Internet? ! network edge: hosts, access net ! network core: packet/circuit switching, Internet structure ! performance: loss, delay, throughput ! media distribution: UDP, TCP/IP 1 What’s the Internet: “nuts and bolts” view PC ! millions of connected Mobile network computing devices: server Global ISP hosts = end systems wireless laptop " running network apps cellular handheld Home network ! communication links Regional ISP " fiber, copper, radio, satellite access " points transmission rate = bandwidth Institutional network wired links ! routers: forward packets (chunks of router data) What’s the Internet: “nuts and bolts” view ! protocols control sending, receiving Mobile network of msgs Global ISP " e.g., TCP, IP, HTTP, Skype, Ethernet ! Internet: “network of networks” Home network " loosely hierarchical Regional ISP " public Internet versus private intranet Institutional network ! Internet standards " RFC: Request for comments " IETF: Internet Engineering Task Force 2 A closer look at network structure: ! network edge: applications and hosts ! access networks, physical media: wired, wireless communication links ! network core: " interconnected routers " network of networks The network edge: ! end systems (hosts): " run application programs " e.g. Web, email " at “edge of network” peer-peer ! client/server model " client host requests, receives -
The Changing Route to the Last Mile
White paper The changing route to the last mile www.commscope.com 1 In most European countries telecommunications service providers have rolled out either copper or fiber networks as far as the street cabinets or drop points from which connections are made to customer premises. These connections cover what is referred to as the ‘last mile’—the final route taken by a cable from the street to the subscriber. The last mile to the customer is, in most European countries, a copper network, but replacing copper with fiber—or fiber to the home (FTTH)—is being actively considered across the continent. In particular, the so-called Digital Agenda, presented by the European Commission as one of the seven pillars of the Europe 2020 Strategy, suggests that new services such as high definition television or video conferencing need much faster internet access than is generally available in Europe. It proposes that Europe needs download rates of 30 Mbps for all of its citizens and at least 50% of European households subscribing to Internet connections above 100 Mbps by 2020. FTTH is seen as a way of achieving this. This, however, may be easier said than done. Fiber is replacing Fiber, meanwhile, is also coming closer to the home. In fact not just copper in many networks but the closer you bring fiber cable to the fiber to the curb (FTTC) but fiber to the drop point or distribution customer the more expensive it gets, partly because you eventually point (FTTDP) allow fiber terminations within very close range of have to penetrate the customer’s premises. -
Digital Subscriber Lines and Cable Modems Digital Subscriber Lines and Cable Modems
Digital Subscriber Lines and Cable Modems Digital Subscriber Lines and Cable Modems Paul Sabatino, [email protected] This paper details the impact of new advances in residential broadband networking, including ADSL, HDSL, VDSL, RADSL, cable modems. History as well as future trends of these technologies are also addressed. OtherReports on Recent Advances in Networking Back to Raj Jain's Home Page Table of Contents ● 1. Introduction ● 2. DSL Technologies ❍ 2.1 ADSL ■ 2.1.1 Competing Standards ■ 2.1.2 Trends ❍ 2.2 HDSL ❍ 2.3 SDSL ❍ 2.4 VDSL ❍ 2.5 RADSL ❍ 2.6 DSL Comparison Chart ● 3. Cable Modems ❍ 3.1 IEEE 802.14 ❍ 3.2 Model of Operation ● 4. Future Trends ❍ 4.1 Current Trials ● 5. Summary ● 6. Glossary ● 7. References http://www.cis.ohio-state.edu/~jain/cis788-97/rbb/index.htm (1 of 14) [2/7/2000 10:59:54 AM] Digital Subscriber Lines and Cable Modems 1. Introduction The widespread use of the Internet and especially the World Wide Web have opened up a need for high bandwidth network services that can be brought directly to subscriber's homes. These services would provide the needed bandwidth to surf the web at lightning fast speeds and allow new technologies such as video conferencing and video on demand. Currently, Digital Subscriber Line (DSL) and Cable modem technologies look to be the most cost effective and practical methods of delivering broadband network services to the masses. <-- Back to Table of Contents 2. DSL Technologies Digital Subscriber Line A Digital Subscriber Line makes use of the current copper infrastructure to supply broadband services. -
Digital Multi–Programme TV/HDTV by Satellite
Digital multi–programme TV/HDTV by satellite M. Cominetti (RAI) A. Morello (RAI) M. Visintin (RAI) The progress of digital technology 1. Introduction since the WARC’77 is considered and the perspectives of future The significant progress of digital techniques in applications via satellite channels production, transmission and emission of radio are identified. Among these, digital and television programmes is rapidly changing the established concepts of broadcasting. multi–programme television systems, with different quality levels (EDTV, SDTV) and possible The latest developments in VLSI (very–large scale evolution to HDTV, are evaluated in integration) technology have significantly contrib- uted to the rapid emergence of digital image/video terms of picture quality and service compression techniques in broadcast and informa- availability on the satellite channels tion–oriented applications; optical fibre technolo- of the BSS bands (12 GHz and gy allows broadband end–to–end connectivity at 22 GHz) and of the FSS band (11 very high bit–rates including digital video capabil- GHz) in Europe. A usable channel ities; even the narrow–band terrestrial broadcast capacity of 45 Mbit/s is assumed, as channels in the VHF/UHF bands (6–7 MHz and 8 well as the adoption of advanced MHz) are under investigation, in the USA [1] and channel coding techniques with in Europe [2], for the future introduction of digital QPSK and 8PSK modulations. For television services. high and medium–power satellites, in operation or planned, the The interest for digital television in broadcasting receiving antenna diameters and multimedia communications is a clear exam- required for correct reception are ple of the current evolution from the analogue to reported. -
Understanding Bluetooth® 5
Volume 1 Issue 1 Understanding Bluetooth® 5 Primary Logo Secondary Stacked Logo 1 Contents 3 Foreword 4 A Look Back and Ahead 5 Case Study: Bluetooth 5 Automatic Parking Meter 6 Bluetooth 5 Mesh Networking 11 Industry Experts Roundtable 14 Bluetooth 5: Your Questions Answered Weclome From the Editor For design engineers, “methods” can mean many things: The Scientific Method, for example, provides the basis for testing hypotheses. The Engineering Method allows us Editor to solve problems using a systematic approach. Method Engineering allows us to create Deborah S. Ray new methods from existing ones. And, I think we’ve all said, “There’s a method to my madness,” when creating new designs or applying existing ones in new ways. Contributing Writers Barry Manz Publishing high-quality technical content is just one method we use to enable our customers Steven Keeping and subscribers to apply technologies and electronic components in new ways and to help drive Steve Hegenderfer revolution and solutions in their various industries. Methods was conceived to provide a new format Technical Contributors to meet our readers’ evolving information needs. And with the resounding success of our Bluetooth 5 Paul Golata webinar on April 11—and the huge thirst for more information around the concepts and applica- Rudy Ramos tion of the new standard—we knew we had the topic for the first edition of our new ezine. So, like Design and Layout Method Engineering, new methods of content delivery came from a project that was underway. Ryan Snieder This first issue of Methods includes a variety of Bluetooth 5 related content that supports and extends the webinar. -
BANDWIDTH UTILIZATION on CABLE-BASED HIGH SPEED DATA NETWORKS Terry D
BANDWIDTH UTILIZATION ON CABLE-BASED HIGH SPEED DATA NETWORKS Terry D. Shaw, Ph. D.1 CableLabs Abstract These observations indicate the The CableLabs Bandwidth Modeling and importance of deploying DOCSIS 1.1 in Management project addresses the use, order to meet this increasing demand for management, performance simulation, and upstream capacity. Preliminary simulation network economics of cable high-speed data results indicate DOCSIS 1.1 will enable a systems. On this project, we have analyzed significant increase in upstream system consumer usage patterns based upon data carrying capacity over the already collected on live cable-based high-speed substantial capacity of DOCSIS 1.0. These data systems as well as network simulations. simulations indicate that DOCSIS 1.1 will allow almost 20% more upstream capacity Usage data on live cable networks than DOCSIS 1.0. indicate that traffic flows are fairly predictable over DOCSIS™ networks. Simulations have also been used to study Some of the primary patterns emerging the characteristics of specific types of traffic include: found on cable networks. For example, simulations of peer-to-peer applications • Skewed distribution of bandwidth indicate that one user without rate limits can consumption. As a general rule in consume up to 25% of upstream capacity many systems, 30% of the with a usage pattern resembling a very high- subscribers consume about 60% of speed constant bit-rate application. These the data. simulation results highlight the potential • Students drive seasonal benefits for cable operators to manage their characteristics. System usage is bandwidth using tools such as rate limits, appreciably higher during local service tiers, and byte caps on usage. -
How Cable Modems Work by Curt Franklin for Millions of People, Television Brings News, Entertainment and Educational Programs Into Their Homes
How Cable Modems Work by Curt Franklin For millions of people, television brings news, entertainment and educational programs into their homes. Many people get their TV signal from cable television (CATV) because cable TV provides a clearer picture and more channels. See How Cable TV Works for details. Many people who have cable TV can now get a high-speed connection to the Internet from their cable provider. Cable modems compete with technologies like asymmetrical digital subscriber lines (ADSL). If you have ever wondered what the differences between DSL and cable modems are, or if you have ever wondered how a computer network can share a cable with dozens of television channels, then read on. In this article, we'll look at how a cable modem works and see how 100 cable television channels and any Web site out there can flow over a single coaxial cable into your home. Photo courtesy Motorola, Inc. Motorola SB5100E SURFboard Extra Space Cable Modem You might think that a television channel would take up quite a bit of electrical "space," or bandwidth, on a cable. In reality, each television signal is given a 6-megahertz (MHz, millions of cycles per second) channel on the cable. The coaxial cable used to carry cable television can carry hundreds of megahertz of signals -- all the channels you could want to watch and more. (For more information, see How Television Works.) In a cable TV system, signals from the various channels are each given a 6-MHz slice of the cable's available bandwidth and then sent down the cable to your house. -
Bluetooth 4.0: Low Energy
Bluetooth 4.0: Low Energy Joe Decuir Standards Architect,,gy CSR Technology Councilor, Bluetooth Architecture Review Board IEEE Region 6 Northwest Area chair Agenda Wireless Applications Perspective How do wireless devices spend energy? What is ‘classic’ Bluetooth? Wha t is Bluet ooth Low Energy? How do the components work? How low is the energy? Perspective: how does ZigBee & 802.15.4 work? What is Bluetooth Low Energy good for? Where can we learn more? Shilliihort range wireless application areas Voice Data Audio Video State Bluetooth ACL / HS x YYxx Blue too th SCO/eSCO Y x x x x Bluetooth low energy xx x xY Wi-Fi (()VoIP) YYYx Wi-Fi Direct Y Y Y xx ZigBee xx x xY ANT xx x xY State = low bandwidth, low latency data Low Power How do wireless devices spend power? Dutyyy Cycle: how often they are on The wireless world has put a lot of effort into reducing this Protocol efficiency: what do they do when on? Different MACs are tuned for different types of applicati ons TX power: how much power they transmit And how efficient the transmit amplifier is How long they have to transmit when they are on Data rate helps here – look at energy per bit How muchhlh energy the signal processing consumes This is driven by chip silicon process if the DSP dominates This is driven TX power if the RF dominates Example transmit power & efficiency comparisons High rate: 802.11n (single antenna) vs UWB, short range In 90nm, an 802.11n chip might spend ~200mW in DSP, but 500mW in the TX amplifier (mostly because they are about 10% efficient on OFDM carriers) -
Bringing Broadband Over the Last Mile
TELECOM Interactive 97 Infrastructure - Session [GII.9] BROADBAND TECHNOLOGIES - CRASHING THE BANDWIDTH BOTTLENECK BRINGING BROADBAND OVER THE LAST MILE Implementation Issues for ADSL By Mark Huntzinger Director, 3Com ADSL System Product Management Introduction This paper covers some business and technical implementation issues of extending the broadband network to the end user, using Asymmetrical Digital Subscriber Line (ADSL) to send multi-megabit data over ordinary subscriber loops, the “last mile” of the installed copper plant, to end-users. In order for a mass-market, broadband-access network to develop, it requires low costs and flexible services for market segments. Key issues of ADSL service are how to configure and manage concurrent connections from end-users to their multiple service destinations, end-to-end. 3Com sees three implications: · ATM is the key back-end infrastructure needed to build a broadband-access network over the last mile, because it best accommodates end-to-end connections. For the ADSL end user, who is a telecommuter, Internet enthusiast, or small office, ATM does wonderful things. But the carriers must hide the complexity of ATM from the end user; this is a lesson learned from ISDN experience worldwide. · Renovation of the Element Management System and the configuration process are key to making the business case for mass deployment. Management systems will have to learn to look end-to-end, not just at a collection of elements. · Open standards are the key to lowering costs, protecting customers’ investments, and achieving interoperability. ADSL equipment vendors and customers that are slow to adopt open standards endanger their ADSL business.