Phoneline USB Network Adapter
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The Twisted-Pair Telephone Transmission Line
High Frequency Design From November 2002 High Frequency Electronics Copyright © 2002, Summit Technical Media, LLC TRANSMISSION LINES The Twisted-Pair Telephone Transmission Line By Richard LAO Sumida America Technologies elephone line is a This article reviews the prin- balanced twisted- ciples of operation and Tpair transmission measurement methods for line, and like any electro- twisted pair (balanced) magnetic transmission transmission lines common- line, its characteristic ly used for xDSL and ether- impedance Z0 can be cal- net computer networking culated from manufactur- ers’ data and measured on an instrument such as the Agilent 4395A (formerly Hewlett-Packard HP4395A) net- Figure 1. Lumped element model of a trans- work analyzer. For lowest bit-error-rate mission line. (BER), central office and customer premise equipment should have analog front-end cir- cuitry that matches the telephone line • Category 3: BWMAX <16 MHz. Intended for impedance. This article contains a brief math- older networks and telephone systems in ematical derivation and and a computer pro- which performance over frequency is not gram to generate a graph of characteristic especially important. Used for voice, digital impedance as a function of frequency. voice, older ethernet 10Base-T and commer- Twisted-pair line for telephone and LAN cial customer premise wiring. The market applications is typically fashioned from #24 currently favors CAT5 installations instead. AWG or #26 AWG stranded copper wire and • Category 4: BWMAX <20 MHz. Not much will be in one of several “categories.” The used. Similar to CAT5 with only one-fifth Electronic Industries Association (EIA) and the bandwidth. the Telecommunications Industry Association • Category 5: BWMAX <100 MHz. -
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. -
United States Patent (19) 11 Patent Number: 6,119,179 Whitridge Et Al
USOO6119179A United States Patent (19) 11 Patent Number: 6,119,179 Whitridge et al. (45) Date of Patent: Sep. 12, 2000 54) TELECOMMUNICATIONS ADAPTER Primary Examiner Thomas C. Lee PROVIDING NON-REPUDIABLE Assistant Examiner Albert Wang COMMUNICATIONS LOG AND Attorney, Agent, or Firm-Brown RaySman Millstein Felder SUPPLEMENTAL POWER FOR A PORTABLE & Steiner LLP PROGRAMMABLE DEVICE 57 ABSTRACT 75 Inventors: Frederick W. Whitridge, Greenwich; Brendan F. Hemingway, New Haven, A portable adapter that provides non-repudiable telecom both of Conn. munications Services to bar-code reading hand-held com puters and palm-top or tablet-type mobile computerS is 73 Assignee: PDA Peripherals Inc., Greenwich, disclosed. The adapter provides Supplemental power Supply Conn. and processing capacity that Supports API communications functions, Such as interactive voice recognition, conference calling, data encryption, VoIP packetization and other 21 Appl. No.: 09/143,188 Signal-format conversions that are not implemented on 22 Filed: Aug. 28, 1998 mobile computers. In particular, the device automatically logs IP packet identifiers and DOV dialing and status 51 Int. Cl. ............................ G06F 13/14; G06F 3/00; Signals, without the user having access to edit this HO4M 1/OO information, thereby providing a “non-repudiation record 52 U.S. Cl. ............................ 710/72; 455/556; 455/557; of all communications. The adapter also Supports intensive 455/572; 235/380; 235/472.01; 320/114; use of the host computer's Serial port by Supplementing the 375/222 power available from the host computer's battery, or replac 58 Field of Search ............................. 320/114; 235/380, ing that battery with a connector. -
Cisco UCS CNA M72KR-Q Qlogic Converged Network Adapter Data
Data Sheet Cisco UCS CNA M72KR-Q QLogic Converged Network Adapter Cisco Unified Computing System Overview The Cisco Unified Computing System™ is a next-generation data center platform that unites compute, network, storage access, and virtualization into a cohesive system designed to reduce total cost of ownership (TCO) and increase business agility. The system integrates a low-latency, lossless 10 Gigabit Ethernet unified network fabric with enterprise-class, x86-architecture servers. The system is an integrated, scalable, multi-chassis platform in which all resources participate in a unified management domain. Product Overview The Cisco® UCS CNA M72KR-Q QLogic Converged Network Adapter (CNA) is a QLogic-based Fibre Channel over Ethernet (FCoE) mezzanine card that provides connectivity for Cisco UCS B-Series Blade Servers in the Cisco Unified Computing System. Designed specifically for the Cisco UCS blades, the adapter provides high-performance connectivity for SAN and LAN traffic. One Cisco UCS M72KR-Q can do the work of a discrete Fibre Channel host bus adapter (HBA) and Ethernet network interface card (NIC). This convergence means fewer cables, fewer switches, less power consumption, reduced cooling, and unified LAN and SAN management. Figure 1. Cisco UCS CNA M72KR-Q QLogic Converged Network Adapter © 2010 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information. Page 1 of 4 Data Sheet Features and Benefits The Cisco UCS M72KR-Q provides both 10 Gigabit Ethernet and 8-Gbps Fibre Channel functions -
Introduction to Digital Subscriber's Line (DSL) Chapter 2 Telephone
Introduction to Digital Subscriber’s Line (DSL) Professor Fu Li, Ph.D., P.E. © Chapter 2 Telephone Infrastructure · Telephone line dates back to Bell in 1875 · Digital Transmission technology using complex algorithm based on DSP and VLSI to compensate impairments common to phone lines. · Phone line carries the single voice signal with 3.4 KHz bandwidth, DSL conveys 100 Compressed voice signals or a video signals. 1 · 15% phones require upgrade activities. · Phone company spent approximately 1 trillion US dollars to construct lines; · 700 millions are in service in 1997, 900 millions by 2001. · Most lines will support 1 Mb/s for DSL and many will support well above 1Mb/s data rate. Typical Voice Network 2 THE ACCESS NETWORK • DSL is really an access technology, and the associated DSL equipment is deployed in the local access network. • The access network consists of the local loops and associated equipment that connects the service user location to the central office. • This network typically consists of cable bundles carrying thousands of twisted-wire pairs to feeder distribution interfaces (FDIs). Two primary ways traditionally to deal with long loops: • 1.Use loading coils to modify the electrical characteristics of the local loop, allowing better quality voice-frequency transmission over extended distances (typically greater than 18,000 feet). • Loading coils are not compatible with the higher frequency attributes of DSL transmissions and they must be removed before DSL-based services can be provisioned. 3 Two primary ways traditionally to deal with long loops • 2. Set up remote terminals where the signals could be terminated at an intermediate point, aggregated and backhauled to the central office. -
USB to Ethernet Adapter | QUICK SETUP GUIDE RF-PCC132
USB to Ethernet Adapter | QUICK SETUP GUIDE RF-PCC132 Thank you for purchasing this high quality Rocketfish USB to Ethernet Adapter. Use this adapter to instantly connect to a 10/100 Mbps network from the USB port on your desktop or laptop computer. 3 When the installation is complete, click Finish to restart your Package contents computer and finish the installation. • USB to Ethernet Adapter • Driver CD • Quick Setup Guide Setting up the adapter Note: The driver software must be installed before you connect the adapter. The adapter does not need to be connected for the software to install. To install on a Windows PC: 1 Insert the driver CD into the optical drive on your computer. The software should run automatically. The initial installation screen opens. Note: If the software does not run automatically, locate and double-click Run.exe on the driver CD. 4 Connect the USB connector on the adapter to an open USB port on 2 Click on your operating system, then follow on-screen instructions. your desktop or laptop computer. 5 Connect a network cable to the Ethernet port on the adapter. To install on a Mac: 1 Insert the driver CD into the optical drive of your computer. On the driver CD, locate and click AX88772.dmg. Click the DISK IMAGE icon. The driver setup driver setup dialog box opens. Note: If the computer has Windows 8, you do not need to install the driver from the disc. The drivers are installed automatically. 2 When the installer screen opens, click 4 When installation is complete, click Restart to FCC Information Continue to start the installation, then restart the computer and finish the installation. -
CALRAD 70 Series - Telephone Accessories
CALRAD 70 series - telephone accessories CALRAD’S NEW TELEPHONE HEADSETS HANDS FREE TELEPHONE HEADSETS Calrad’s telephone headsets help reduce phone fatigue and provides hands-free convenience for working on computer data entry, taking notes, and in fact do the work you need to do and talk on the phone at the same time. Adjustable volume control, telephone/headset selection switch, voice mute button. All units come with base unit, headset, and cables. 70-600 TELEPHONE LINE POWERED This unit works directly when connected to your telephone. Requires two AA batteries, not included. 70-601 BATTERY POWERED This unit works with most home type instruments. A selectable configuration switch is provided on the side of the unit for easy interfacing to your telephone equipment. This unit connects to your handset jack on the telephone. Two AA batteries not included. 70-602 BATTERY / DC POWERED This unit works with most business type instruments. A selectable configuration switch is provided on the side of the unit for easy interfacing to your telephone equipment. This unit easily connects to your handset jack on the telephone. A small opening on the front of the unit is provided so that a small phillips screwdriver can be used to adjust the microphone gain. Two AA batteries/AC adapter not included. AC adapter is 45-756-S. FLUSH MOUNT, SINGLE-JACK FLUSH MOUNT, MODULAR WALL PLATES DECORA STYLE For new construction or conversion to modular instruments. Screw terminals. MODULAR WALL PLATES 70-403 ..................................................4-Wire, Ivory Wall plates designed to accept 70-403-W ..........................................4-Wire, White modular plugs. -
IBM Monochrome Display and Printer Adapter Has Two Functions
-------- ---- ---- Personal Computer -------_.- - - --- Hardware Reference Library mM Monochrome Display and Printer Adapter 6361511 ii Contents Introduction ................................... 1 Monochrome Display Adapter Function .............. 1 Description ................................ 1 Programming Considerations .................. 5 Specifications .............................. 9 Printer Adapter Function ........................ 11 Description ............................... 11 Programming Considerations ................. 13 Specifications ............................. 17 Logic Diagrams ................................ 19 ill iv Introduction The IBM Monochrome Display and Printer Adapter has two functions. The first is to provide an interface to the IBM ~ Monochrome Display. The second is to provide a parallel interface for the IBM Printers. We will discuss this adapter by function. Monochrome Display Adapter Function Description The IBM Monochrome Display and Printer Adapter is designed around the Motorola 6845 CRT Controller module. There are 4K bytes of RAM on the adapter that are used for the display .~ buffer. This buffer has two ports to which the system unit's microprocessor has direct access. No parity is provided on the display buffer. Two bytes are fetched from the display buffer in 553 ns, providing a data rate of 1.8M bytes/second. The adapter supports 256 different character codes. An 8K-byte character generator contains the fonts for the character codes. The characters, values, and screen characteristics are given -
CPU) the CPU Is the Brains of the Computer, and Is Also Known As the Processor (A Single Chip Also Known As Microprocessor)
Central processing unit (CPU) The CPU is the brains of the computer, and is also known as the processor (a single chip also known as microprocessor). This electronic component interprets and carries out the basic instructions that operate the computer. Cache as a rule holds data waiting to be processed and instructions waiting to be executed. The main parts of the CPU are: control unit arithmetic logic unit (ALU), and registers – also referred as Cache registers The CPU is connected to a circuit board called the motherboard also known as the system board. Click here to see more information on the CPU Let’s look inside the CPU and see what the different components actually do and how they interact Control unit The control unit directs and co-ordinates most of the operations in the computer. It is a bit similar to a traffic officer controlling traffic! It translates instructions received from a program/application and then begins the appropriate action to carry out the instruction. Specifically the control unit: controls how and when input devices send data stores and retrieves data to and from specific locations in memory decodes and executes instructions sends data to other parts of the CPU during operations sends data to output devices on request Arithmetic Logic Unit (ALU): The ALU is the computer’s calculator. It handles all math operations such as: add subtract multiply divide logical decisions - true or false, and/or, greater then, equal to, or less than Registers Registers are special temporary storage areas on the CPU. They are: used to store items during arithmetic, logic or transfer operations. -
Hardware Components and Internal PC Connections
Technological University Dublin ARROW@TU Dublin Instructional Guides School of Multidisciplinary Technologies 2015 Computer Hardware: Hardware Components and Internal PC Connections Jerome Casey Technological University Dublin, [email protected] Follow this and additional works at: https://arrow.tudublin.ie/schmuldissoft Part of the Engineering Education Commons Recommended Citation Casey, J. (2015). Computer Hardware: Hardware Components and Internal PC Connections. Guide for undergraduate students. Technological University Dublin This Other is brought to you for free and open access by the School of Multidisciplinary Technologies at ARROW@TU Dublin. It has been accepted for inclusion in Instructional Guides by an authorized administrator of ARROW@TU Dublin. For more information, please contact [email protected], [email protected]. This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License Higher Cert/Bachelor of Technology – DT036A Computer Systems Computer Hardware – Hardware Components & Internal PC Connections: You might see a specification for a PC 1 such as "containing an Intel i7 Hexa core processor - 3.46GHz, 3200MHz Bus, 384 KB L1 cache, 1.5MB L2 cache, 12 MB L3 cache, 32nm process technology; 4 gigabytes of RAM, ATX motherboard, Windows 7 Home Premium 64-bit operating system, an Intel® GMA HD graphics card, a 500 gigabytes SATA hard drive (5400rpm), and WiFi 802.11 bgn". This section aims to discuss a selection of hardware parts, outline common metrics and specifications -
System Unit Is a Case That Contains Electronic Components of the Computer Used to Process Data. Made of Metal Or Plastic To
10/12/2017 The Components of the system unit System Unit is a case that contains electronic components of the computer used to process data. Made of metal or plastic to protects the internal components from damage. All computers have a system unit. It is available in variety of shapes & sizes. 1 10/12/2017 The Components of the system unit System unit System System unit unit System unit System unit Handheld controller The Components of the system unit 2 10/12/2017 The Components of the system unit 1. Processor interprets & carries out the basic instructions that operate a computer. 2. Memory holds data waiting to be processed & instruction waiting to be executed. 3. Processor & Memory are connected to a circuit board called the motherboard. 4. Adapter cards (expansion slots): are circuit boards that provide connections and functions not built into the motherboard. 5. Devices outside the system unit often attach to the ports. 6. A drive bay holds one or more disk drive. 7. The Power supply provide the computer with the electricity. The Components of the system unit Motherboard , called system board. It is a main circuit board of the system unit. Many electronic components attach to the motherboard, others are built into it. Ex: adapter cards, a processor chip and a memory module. 3 10/12/2017 Central Processing Unit (CPU) Processor, called the central processing unit (CPU), Microprocessor. CPU Control Unit Arithmetic/ Logic Unit (ALU) Its contain a control unit & an arithmetic logic unit (ALU). These 2 components work together to perform processing operations. Processor Control Unit ALU Instructions Data Information INPUT OUTPUT MEMORY DEVICES Data information DEVICES Instructions Data Information Storage Devices 4 10/12/2017 Central Processing Unit (CPU) The operations typically performed by a CPU are: 1. -
Network Cable: Networking Cables Are Used to Connect One Network
Network cable: Networking Cables are used to connect one network device to other or to connect two or more computers to share printers, scanners etc. Different types of network cables like Coaxial cable, optical fiber cable, Twisted Pair cables are used depending on the network's topology, protocol and size. The devices can be separated by a few meters (e.g. via Ethernet) or nearly unlimited distances (e.g. via the interconnections of the Internet). While wireless may be the wave of the future, most computer networks today still utilize cables to transfer signals from one point to another. Network card: A network card is a an adapter card, pc card, express card module, USB network adapter ,or flash card that enables a computer or device that not have networking capability to access a network. The network card coordinates the transmission and receipt of data, instruction , and information to and from the computer or devices containing the network card. Network cards are available in a variety of style. A network card for a desktop computer is an adapter card that has a port to which a cable connects. A network card for mobile computers and devices is in the form of a pc card ,express card module, USB network adapter, or a flash card. Network cards that provide wireless data transmission also are available. This type of card, sometimes called a wireless network card ,often has an antenna. A network card follow the guidelines of a particular network communication standard, such as Ethernet or token ring. An Ethernet card is the most common type of network card.