Analog Access to the Telephone Network
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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. -
Modem and Networking Compaq Notebook Series
267639-001.book Page i Friday, January 18, 2002 8:31 AM b Modem and Networking Compaq Notebook Series Document Part Number: 267639-001 April 2002 This guide describes the modem and networking features on the notebook and explains how to connect a modem cable and a network cable. It also provides instructions for using the modem when travelling internationally. 267639-001.book Page ii Friday, January 18, 2002 8:31 AM © 2002 Compaq Information Technologies Group, L.P. Compaq, the Compaq logo, Evo, and Presario are trademarks of Compaq Information Technologies Group, L.P. in the U.S. and/or other countries. Microsoft and Windows are trademarks of Microsoft Corporation in the U.S. and/or other countries. All other product names mentioned herein may be trademarks of their respective companies. Compaq shall not be liable for technical or editorial errors or omissions contained herein. The information is provided “as is” without warranty of any kind and is subject to change without notice. The warranties for Compaq products are set forth in the express limited warranty statements accompanying such products. Nothing herein should be construed as constituting an additional warranty. Modem and Networking Guide First Edition April 2002 Document Part Number: 267639-001 267639-001.book Page iii Friday, January 18, 2002 8:31 AM Contents 1 Using an Internal Modem Connecting the Modem Cable . 1–2 Using the RJ-11 Cable. 1–2 Using a Country-Specific Modem Cable Adapter. 1–4 Adding New Locations When Travelling . 1–6 Solving Travel Connection Problems . 1–7 Accessing Preinstalled Communication Software . -
Operating Manual One Piece Telephone
OPERATING MANUAL 915044V0E21J ONE PIECE TELEPHONE FEATURES OF YOUR TELEPHONE HEARING-AID COMPATIBLE HANDSET The handset on your telephone is equipped with a TONE/PULSE switch, RINGER HI LO OFF switch, MUTE, FLASH and REDIAL buttons, and a receiver that works with magnetically coupled hearing aids. ON/OFF SWITCH Press this switch to turn on the telephone to make or receive a call. When the phone is on, this button is lighted. Press it again to hang up. RINGER VOLUME CONTROL The 3 position switch is used to set ringer volume. You can select high volume (HI), low volume (LO), or you can silence the ringer (OFF). TONE/PULSE SWITCH The TONE/PULSE switch is used to set the type of dialing for your telephone to match the service from your local telephone company. PUSH BUTTON DIAL The push button dial is used to dial telephone numbers. MUTE BUTTON When the MUTE button is pressed and held, the other party cannot hear the conversation at your telephone. You can continue to listen to the other party. FLASH BUTTON The FLASH button sends a signal to the telephone service provider which tells the office that you wish to use a special feature. The results of a FLASH signal will depend on the services which are available. REDIAL BUTTON The telephone stores the last number dialed (32 digits maximum) in memory. This number may be dialed by lifting the handset and pressing the REDIAL button. The number in memory may be erased by lifting the handset and dialing any digit. HEADPHONE JACK This 3.5mm jack allows the connection of headphones or ear buds. -
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. -
DATASHEET SEARCH SITE == Pdf.Jiepei.Com
Si2457/34/15/04 V.90, V.34, V.32BIS, V.22BIS ISOMODEM® WITH GLOBAL DAA Features Data modem formats Integrated DAA ITU-T, Bell Over 6000 V Capacitive isolation 300 bps up to 56 kbps Parallel phone detect V.21,V.22, V.29 Fast Connect Globally-compliant line interface V.42, V.42bis, MNP2-5 Overcurrent detection Automatic rate negotiation Type I and II caller ID decode 27 MHz clock input No external ROM or RAM required 3.3 V power Ordering Information UART or parallel interface Firmware upgradeable AT command set support EEPROM interface This data sheet is valid only for SMS / MMS support Lead-free, RoHS Compliant those chipset combinations listed Packages on page page 70. Applications Pin Assignments Set-top boxes Digital video recorder Point-of-sale terminals Digital televisions Text/video telephones Remote monitoring Si2457/34/15/04 (16-Pin Option) Description CLKIN/XTALI 1 16 RTS XTALO 2 15 DCD ® The ISOmodem family of products is a complete modem ranging in RI 3 14 ESC VD 4 speed from 56,000 bps to 2400 bps. Offered as a chipset with the Si2457, 13 VA RXD 5 12 GND Si2434, Si2415, or Si2404 system-side device and the Si3018/10 line- TXD 6 11 INT side device, the ISOmodem utilizes Silicon Laboratories’ patented Direct CTS 7 10 C1A Access Arrangement (DAA) technology to provide a programmable RESET 8 9 C2A telephone line interface with an unparalleled level of integration. These compact solutions eliminate the need for a separate DSP, modem Si2457/34/15/04 controller, codec, transformer, relay, opto-isolators, clocking crystal, and (24-Pin Option) 2-4 wire hybrid. -
Digital Television Systems
This page intentionally left blank Digital Television Systems Digital television is a multibillion-dollar industry with commercial systems now being deployed worldwide. In this concise yet detailed guide, you will learn about the standards that apply to fixed-line and mobile digital television, as well as the underlying principles involved, such as signal analysis, modulation techniques, and source and channel coding. The digital television standards, including the MPEG family, ATSC, DVB, ISDTV, DTMB, and ISDB, are presented toaid understanding ofnew systems in the market and reveal the variations between different systems used throughout the world. Discussions of source and channel coding then provide the essential knowledge needed for designing reliable new systems.Throughout the book the theory is supported by over 200 figures and tables, whilst an extensive glossary defines practical terminology.Additional background features, including Fourier analysis, probability and stochastic processes, tables of Fourier and Hilbert transforms, and radiofrequency tables, are presented in the book’s useful appendices. This is an ideal reference for practitioners in the field of digital television. It will alsoappeal tograduate students and researchers in electrical engineering and computer science, and can be used as a textbook for graduate courses on digital television systems. Marcelo S. Alencar is Chair Professor in the Department of Electrical Engineering, Federal University of Campina Grande, Brazil. With over 29 years of teaching and research experience, he has published eight technical books and more than 200 scientific papers. He is Founder and President of the Institute for Advanced Studies in Communications (Iecom) and has consulted for several companies and R&D agencies. -
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. -
Telephone Line Interface FT 635 UELE
Telephone Line Interface FT 635 UELE Kompetent für Elektroniksysteme Table of Contents Connection possibilities 3 Connection examples 4 Carrier detection 5 Transmitter control 5 Transmitter follow-up time 6 Transmission time limit 6 Transmitter lead-up time 6 In- and outputs 7 Inputs 7 Outputs 8 Digital output control 8 AF-signals (telephone to radio) 9 AFsignals (radio to telephone) 9 AF-signaling pathways 9 DTMF 9 Tone Sequence Encoder and Decoder 10 Dial-up - Telephone -> Radio 13 Direct Dialing by DTMF - Telephone -> Radio 13 Automatic Connection - Telephone -> Radio 13 Automatic Call Forwarding with Direct Call - Tel -> Radio 14 Night Mode - Telephone -> Radio 14 Direct Dialing with DTMF - Radio -> Telephone 14 Radio -> Telephone 14 Direct Dialing with tone sequence - Radio -> Telephone 15 Speed Dail - Radio -> Telephone 15 Speed Dial Memory 16 Call Monitoring 16 Operating Mode 17 Voice Announcement (Option) 18 Example for the configuration 19 Call progress tone detection 20 T11-55 22 EEPROM register layout 23 Register in TIM (Telefon Interface Modul) 28 DTMF Geber, Auswerter 29 Installation TIM (Telephone Interface Module) 32 Connector pinout 33 RS232-Connection cable 35 Service program and setting 35 Ordering information 38 Technical data 38 General Safety Instructions 39 Revision remarks 40 - 2 - ft635ule_eng (21.06.2012) - 3 - ft635ule _eng(21.06.2012) Kompetent für Elektroniksysteme Kompetent für Elektroniksysteme FT635 Telephone Line Interface The FT635 telephone line interface (UELE) consists of a CPU card of Europe with an attached TIM (telephone interface module). There are 3 different housings available. The standard version is a flange aluminum housing. There also is a 19“ plug-in unit and a special version in the FT635 system housing.The version in the system housing has a connector which is pin-compatible to FT633UELE to the two-way radio.In the standard version only the most important connectors are available as sockets on the front. -
Telecommunication Switching Networks
TELECOMMUNICATION SWITCHING AND NETWORKS TElECOMMUNICATION SWITCHING AND NffiWRKS THIS PAGE IS BLANK Copyright © 2006, 2005 New Age International (P) Ltd., Publishers Published by New Age International (P) Ltd., Publishers All rights reserved. No part of this ebook may be reproduced in any form, by photostat, microfilm, xerography, or any other means, or incorporated into any information retrieval system, electronic or mechanical, without the written permission of the publisher. All inquiries should be emailed to [email protected] ISBN (10) : 81-224-2349-3 ISBN (13) : 978-81-224-2349-5 PUBLISHING FOR ONE WORLD NEW AGE INTERNATIONAL (P) LIMITED, PUBLISHERS 4835/24, Ansari Road, Daryaganj, New Delhi - 110002 Visit us at www.newagepublishers.com PREFACE This text, ‘Telecommunication Switching and Networks’ is intended to serve as a one- semester text for undergraduate course of Information Technology, Electronics and Communi- cation Engineering, and Telecommunication Engineering. This book provides in depth knowl- edge on telecommunication switching and good background for advanced studies in communi- cation networks. The entire subject is dealt with conceptual treatment and the analytical or mathematical approach is made only to some extent. For best understanding, more diagrams (202) and tables (35) are introduced wherever necessary in each chapter. The telecommunication switching is the fast growing field and enormous research and development are undertaken by various organizations and firms. The communication networks have unlimited research potentials. Both telecommunication switching and communication networks develop new techniques and technologies everyday. This book provides complete fun- damentals of all the topics it has focused. However, a candidate pursuing postgraduate course, doing research in these areas and the employees of telecom organizations should be in constant touch with latest technologies. -
Calistopro User Guide
Calisto™ Pro Series Home Phone with Multi-function Bluetooth® Headset Incoming Call John Smith 123-456-7890 Ignore Answer User Guide Please refer to the Safety Instructions on page 53 for important product safety information prior to installation or use of this product. With the Calisto Pro Series product, you get maximum flexibility for handling all of your calls: • Answer landline and VoIP calls using either the handset, the built-in speakerphone, or the wireless headset. • Use the headset with other devices enabled with Bluetooth® technology, such as your Bluetooth mobile phone. This User Guide provides comprehensive information on how to use your Calisto Pro Series and all of its features. TIP: For a quick reference to common features, see the QuickTips card, located under the base of your Calisto Pro Series. When you see this symbol next to a topic in this User Guide, it means that you can find a quick reference for this topic on the QuickTips card. Page Contents Components . Setup. 4 Hooking up the base. 4 Completed system . 4 Installing the handset battery. 5 Charging the handset. 5 Charging the headset. 5 Wearing the headset and handset. 6 Replacing the handset battery. 7 Powering the Headset On and Off. 8 Powering your headset on. 8 Powering your headset off. 8 Using Your Headset with Your Handset. 9 Placing calls . 9 Receiving calls . 9 Adjusting call volume. 10 Switching calls between handset, headset, and speakerphone 10 Ending calls. 11 Locating the headset from the handset. 11 Using Your Calisto Headset with Your Mobile Phone. 1 Pairing your Calisto headset with your mobile phone . -
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. -
Analog Output Signal the Signal Saturation Can Be Controlled by Setting the Respective ▪ Introduction AO-LL and the AO-UL
FieldGuide Enhance Operations Analog Output Signal The Signal Saturation can be controlled by setting the respective ▪ Introduction AO-LL and the AO-UL. The AO-LL and the AO-UL are programmable Yokogawa’s pressure transmitters with BRAIN or HART within the parameter limits of the transmitter via the FieldMate. communication have a 4 to 20 mA analog signal corresponding to the Primary Variable (PV). This output signal is generated from the digital signal supplied by the DPHarp sensor using a 15BitD/A signal converter with 0.004% resolution. The transmitters are designed to drive output slightly greater than the 4 to 20 mA “Base” signal. The intention is to set analog alarm thresholds recognizably beyond the normal operating 4 to 20 mA range, to indicate measurement our of range, and to set further alarm thresholds to indicate a fault condition. ▪ Applicable Models > EJA-E Series: All models with either BRAIN or HART communication > EJX-A Series: All models with either BRAIN or HART communication ▪ Process Measurement Out-of-Range Standard Analog Output Signal Yokogawa’s standard analog output transmitters are factory set to an Analog Output– Lower Limit (AO-LL) and Analog Output-Upper Limit The AO-LL and the AO-UL can be set to any value between 3.6 mA to (AO-UL) of 3.6 mA and 21.6 mA respectively. This allows for a small 21.6 mA. amount of linear over-range process readings. This over-range signal is referred to as Signal Saturation. During operation, if the AO-LL or Although FieldMate is highlighted here, any Hart Communicator has AO-UL limits are reached, the analog signal locks to the respective access to these functions.