Model 1121 Cause Harmful Interference to Radio Communications

Total Page:16

File Type:pdf, Size:1020Kb

Model 1121 Cause Harmful Interference to Radio Communications • If your home has specially wired alarm equipment connected to the Important Safety Instructions telephone line, ensure the installation of this product does not disable When using your telephone equipment, basic safety precautions should your alarm equipment. If you have questions about what will disable always be followed to reduce the risk of fire, electric shock and injury to alarm equipment, consult your telephone company or a qualified persons, including the following: 1. Do not use this product near water, for installer. VOL example, near a bath tub, wash bowl, kitchen sink or laundry tub, in a wet • This corded phone is a type that is not intended to be repaired by (volume basement or near a swimming pool. 2. Avoid using a telephone (other than customer (user). switch) a cordless type) during an electrical storm. There may be a remote risk of US Number is located on the cabinet bottom. electric shock from lightning. 3. Do not use the telephone to report a gas leak REN Number is located on the cabinet bottom. in the vicinity of the leak. 2 Rights of the Telephone Company Save These Instructions Amplifier Trimline Phone Should your equipment cause trouble on your line which may harm the User’s Guide telephone network, the telephone company shall, where practicable, notify store (button) redial you that temporary discontinuance of service may be required. Where prior (button) notice is not practicable and the circumstances warrant such action, the telephone company may temporarily discontinue service immediately. In case of such temporary discontinuance, the telephone company must: (1) promptly notify you of such temporary discontinuance; (2) afford you the flash mem (button) opportunity to correct the situation; and (3) inform you of your right to bring a (memory button) complaint to the Commission pursuant to procedures set forth in Subpart E of Part 68, FCC Rules and Regulations. The telephone company may make changes in its communications facilities, equipment, operations or procedures where such action is required in the Introduction mem (memory button) operation of its business and not inconsistent with FCC Rules and Regulations. CAUTION: When using telephone equipment, there are If these changes are expected to affect the use or performance of your basic safety instructions that should always be followed. telephone equipment, the telephone company must give you adequate Refer to the IMPORTANT SAFETY INSTRUCTIONS provided notice, in writing, to allow you to maintain uninterrupted service. ringer with this product and save them for future reference. Interference Information (switch) This device complies with Part 15 of the FCC Rules. Operation is subject to the Short Glossary of Terminology Used in this Manual following two conditions: (1) This device may not cause harmful interference; Hook switch. The part of the phone that pops up to activate the phone line and (2) This device must accept any interference received, including when the handset is lifted from the base. Please read this manual before operating interference that may cause undesired operation. Off-hook. A term used to describe the phone in its active mode when the product for the first time. This equipment has been tested and found to comply with the limits for a handset is off of the base cradle. Installing the Phone Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are On-hook. A term used to describe the phone in an inactive mode. Visit the RCA web site at www.rca4phones.com designed to provide reasonable protection against harmful interference in a Your telephone should be placed on a level surface such as a desk or table residential installation. Before You Begin top, or you can mount it on a wall. A desktop/wall mounting pedestal is built This equipment generates, uses, and can radiate radio frequency energy into the base of the phone. 1. Slide the ringer switch to the desired volume. and, if not installed and used in accordance with the instructions, may Telephone Jack Requirements wall plate Model 1121 cause harmful interference to radio communications. However, there is no 2. Set the tone-pulse switch guarantee that interference will not occur in a particular installation. To use this phone, you need an RJ11C type modular (on the handset) to TONE for If this equipment does cause harmful interference to radio or television telephone jack, which might look like the one pictured Modular touch-tone service, or set it Equipment Approval Information reception, which can be determined by turning the equipment off and on, the here, installed in your home. If you don’t have a modular telephone to PULSE for rotary service. If user is encouraged to try to correct the interference by one or more of the jack, call your local phone company to find out how to line jack you don’t know which type of Your telephone equipment is approved for connection to the Public Switched following measures: get one installed. service you have, check with Telephone Network and is in compliance with parts 15 and 68, FCC Rules • Reorient or relocate the receiving antenna (that is, the antenna for radio Important Installation Information the phone company. and Regulations and the Technical Requirements for Telephone Terminal or television that is “receiving” the interference). 3. Set the VOL switch to the Equipment published by ACTA. • Reorient or relocate and increase the separation between the • Never install telephone wiring during a lightning storm. desired listening volume. 4. Plug the telephone line cord 1 Notification to the Local Telephone Company telecommunications equipment and receiving antenna. • Never touch uninsulated telephone wires or terminals, unless the into a modular wall phone jack. On the bottom of this equipment is a label indicating, among other • Connect the telecommunications equipment into an outlet on a circuit telephone line has been disconnected at the network interface. • Use caution when installing or modifying telephone lines. information, the US number and Ringer Equivalence Number (REN) for different from that to which the receiving antenna is connected. Wall Mount Installation the equipment. You must, upon request, provide this information to your If these measures do not eliminate the interference, please consult • Never install telephone jacks in wet locations unless the jack is specifically telephone company. your dealer or an experienced radio/television technician for additional designed for wet locations. Your telephone may also be mounted on a wall plate (not included). The REN is useful in determining the number of devices you may connect suggestions. Also, the Federal Communications Commission has prepared • Temporarily disconnect any equipment connected to the phone, such as NOTE: To prevent the handset from falling out of the cradle while to your telephone line and still have all of these devices ring when your a helpful booklet, “How To Identify and Resolve Radio/TV Interference faxes, other phones, or modems. the phone is hanging on the wall, you must rotate the handset telephone number is called. In most (but not all) areas, the sum of the RENs Problems.” This booklet is available from the U.S. Government Printing Office, Base & Handset Layout hook 180° (located on the base). (See diagram below) of all devices connected to one line should not exceed 5. To be certain of the Washington, D.C. 20402. Please specify stock number 004-000-00345-4 when number of devices you may connect to your line as determined by the REN, ordering copies. • Rotate the hook 180°. (Refer to Dia. 1A) you should contact your local telephone company. Caution: The changes or modifications not expressly approved by the party • Turn the phone over so that the bottom of responsible for compliance could void the user’s authority to operate the A plug and jack used to connect this equipment to the premises wiring ring indicator the base is facing up and the thickest end and telephone network must comply with the applicable FCC Part 68 rules equipment. is pointing away from you. and requirements adopted by the ACTA. A compliant telephone cord and Hearing Aid Compatibility (HAC) • If desired gather the extra telephone line modular plug is provided with this product. It is designed to be connected to cord together and store inside the wall a compatible modular jack that is also compliant. See installation instructions This telephone system meets FCC standards for Hearing Aid Compatibility. boost (button) mounting pedestal, and then thread the for details. Industry Canada (I.C.) Notice line cord through the grooves on the Notes pedestal according to the illustration. • This equipment may not be used on coin service provided by the This product meets the applicable Industry Canada technical specifications. tone control • With the rounded end of the pedestal (Dia. 1A) telephone company. Le présent materiel est conforme aux specifications techniques applicables (switch) pointing upward, insert the tab on the • Party lines are subject to state tariffs, and therefore, you may not be able d'Industrie Canada.” end of the pedestal into the middle slot to use your own telephone equipment if you are on a party line. Check The Ringer Equivalence Number is an indication of the maximum number of on the bottom of the base, then push with your local telephone company. terminals allowed to be connected to a telephone interface. The termination the pedestal down until the two tabs on • Notice must be given to the telephone company upon permanent on an interface may consist of any combination of devices subject only to the left and right corners of the pedestal disconnection of your telephone from your line. the requirement that the sum of the Ringer Equivalence Numbers of all the snap (lock) into the two lower slots on the devices does not exceed five.
Recommended publications
  • 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 .
    [Show full text]
  • 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.
    [Show full text]
  • 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.
    [Show full text]
  • 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.
    [Show full text]
  • 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.
    [Show full text]
  • 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 .
    [Show full text]
  • Analog Access to the Telephone Network
    Telecommunications Telephony Analog Access to the Telephone Network Courseware Sample 32964-F0 Order no.: 32964-00 First Edition Revision level: 01/2015 By the staff of Festo Didactic © Festo Didactic Ltée/Ltd, Quebec, Canada 2001 Internet: www.festo-didactic.com e-mail: [email protected] Printed in Canada All rights reserved ISBN 978-2-89289-541-4 (Printed version) Legal Deposit – Bibliothèque et Archives nationales du Québec, 2001 Legal Deposit – Library and Archives Canada, 2001 The purchaser shall receive a single right of use which is non-exclusive, non-time-limited and limited geographically to use at the purchaser's site/location as follows. The purchaser shall be entitled to use the work to train his/her staff at the purchaser's site/location and shall also be entitled to use parts of the copyright material as the basis for the production of his/her own training documentation for the training of his/her staff at the purchaser's site/location with acknowledgement of source and to make copies for this purpose. In the case of schools/technical colleges, training centers, and universities, the right of use shall also include use by school and college students and trainees at the purchaser's site/location for teaching purposes. The right of use shall in all cases exclude the right to publish the copyright material or to make this available for use on intranet, Internet and LMS platforms and databases such as Moodle, which allow access by a wide variety of users, including those outside of the purchaser's site/location.
    [Show full text]
  • Chapter 14: Telephony and Cellular Networks 14-1 the System View
    Chapter 14: Telephony and Cellular Networks Chapter 14 Objectives At the conclusion of this chapter, the reader will be able to: • Describe the overall topology of the U.S. telephone network. • List the electrical characteristics of an analog POTS subscriber local loop. • Describe the operation and characteristics of a typical analog CPE • Describe the DTMF signaling standard. • Describe the digital signaling standards used in the telephone system. • Describe the operation of digital traffic switches. • Compare and contrast AMPS and PCS service characteristics. • Describe how subscriber signals are carried through a PCS network. • Given a frequency reuse map for a PCS market, identify the groups of frequencies utilized by each cell in the market. • Describe the operation of DSL/ADSL subscriber services. • Describe a typical installation for VoIP equipment. “Mr. Watson, come here, I want you.” These historic words were the first speech to be successfully transmitted through wires, uttered by Alexander Graham Bell to his assistant in March of 1876. It was the beginning of the second wave of the telecommunications revolution, started by the invention of the telegraph in 1833. Now a basic part of modern life, the telephone system is one of the most creative and complex achievements of humankind. Over its lifetime, it has directly influenced and benefited from many advancements in electronic technology. The modern telephone system uses analog and digital circuitry, computers, advanced signal encoding, and of course a healthy dose of wireless technology. Let’s see how it all works together. 14-1 The System View In the earliest days of the telephone, no more than a few hundred telephone sets existed.
    [Show full text]
  • User Guide D704™ D702™ Big Button Cordless Phone
    D704™ D702™ User Guide Big Button Cordless Phone Clarity, a Division of Plantronics, Inc. 6131 Preservation Drive, Chattanooga,TN 37416 Tel: 800-426-3738 Fax: 800-325-8871 E-mail: [email protected] Website: www.clarityproducts.com ©2011 Clarity, a Division of Plantronics, Inc.All rights reserved. Clarity, D704, D702, D702HS, D704HS are trademarks or registered trademarks of Plantronics, Inc. Rev.D (12-15) PRINTED IN CHINA TABLE OF CONTENTS Important Safety Instructions.........................................................4 INSTALLATION Installing your phone - Base............................................................8 Installing batteries - Handset...........................................................9 OVERVIEW Handset Overview...........................................................................10 Base Overview..................................................................................14 Handsest Screen Icons....................................................................15 Handset Menu Structure................................................................16 Handset - Text Entry Table.............................................................17 HANDSET AUDIO OPERATIONS Audio Tone Settings.........................................................................18 Audio Boost......................................................................................18 Audio Volume Settings....................................................................19 Mute....................................................................................................19
    [Show full text]
  • Modular ICS 6.0 System Coordinator Guide
    Modular ICS 6.0 System Coordinator Guide Norstar, Meridian and Companion are trademarks of Nortel Networks © Nortel Networks 2002 1-800-4 NORTEL www.nortel.com/norstar P0992640 02 Printed in Canada Table of Contents Getting started with Norstar 13 Using this guide 13 Understanding programming 14 Before you start 15 What you need to be to do programming 15 Using Buttons 16 Using the buttons under the display 19 The programming overlay 19 A map for working in programming 22 Starting and ending a session 26 Ending a session 26 Frequently used programming operations 29 Changing the time and date on the display 29 Adding or changing a system speed dial 31 Changing the name of a telephone 34 Changing the name of a line 35 Making changes to Call Forward No Answer 36 Making changes to Call Forward on Busy 38 Making Changes to Do Not Disturb on Busy 39 What would you like to do next? 40 Answering calls 43 Answering incoming calls with Hunt Groups 43 Answering an incoming call 43 Line buttons 44 What line indicators mean 44 Rings you may hear 44 Sorting calls by distinctive ring patterns 45 Answering calls at a prime telephone 46 Using a central answering position (CAP) module 47 Customizing your CAP module 47 Monitoring telephones with the CAP module 48 Release button 48 P0992640 02 Modular ICS 6.0 System Coordinator Guide 4 / Table of Contents Hearing aid compatibility 49 Viewing information about a call on the display 49 Using Call Information for a particular call 49 Displaying Call Information before or after answering 50 Displaying Call Information
    [Show full text]
  • KX-TA624 User Manual
    Advanced Hybrid System User Manual Model No. KX-TA624 Please read this manual before using the Advanced Hybrid System. Thank you for purchasing this Panasonic Telephone System. System Components Model No. Description Service Unit KX-TA624 Advanced Hybrid System (Main Unit) KX-T7020 EMSS Proprietary Telephone KX-T7030 EMSS Proprietary Telephone with Display Telephone KX-T7130 EMSS Proprietary Telephone with Display KX-T7135 EMSS Proprietary Telephone with Backlit Display KX-T7050 EMSS Proprietary Telephone KX-T7055 EMSS Proprietary Telephone Optional Equipment KX-T7040 DSS Console User-supplied Equipment Single Line Telephones For your future reference SERIAL NO. (found on the side of the unit) DATE OF PURCHASE NAME OF DEALER DEALER’S ADDRESS DEALER’S TEL NO. 2 Cautions When using the KX-T7000 series, please note the following: • If a problem occurs, unplug the extension line and connect to a known working phone. If the known working phone operates properly, have the defective phone repaired by a specified Panasonic Factory Servicenter. If the known working phone does not operate properly, check the Advanced Hybrid System and the internal extension wiring. • Keep the unit away from heating appliances and electrical noise generating devices such as fluorescent lamps and motors. • The unit should be kept free of dust, moisture and vibration, and should not be exposed to direct sunlight. • Do not use benzine, thinner, or any abrasive powder to clean the cabinet. Wipe it with a soft cloth. • Do not use any handset other than a Panasonic handset. When you ship the product Carefully pack and send it prepaid, adequately insured and preferably in the original carton.
    [Show full text]
  • Dual Tone Multi Frequency Signaling
    Contents 1 Introduction 2 2 History and Evolution 3 3 Technology 5 3.1 DTMF Keys 5 3.2 DTMF Frequencies 6 3.3 Special Tones 7 3.4 DTMF Transmission 8 3.5 DTMF Programming 9 4 Technical Standards 11 5 Applications 12 5.1 Applications in the Call Center Industry 13 6 VoIP and DTMF 14 7 Advantages of Using DTMF 15 8 Conclusion 16 9 References 17 1 © Specialty Answering Service. All rights reserved. 1 Introduction Dual Tone Multi Frequency, or DTMF as it is popularly known as, is the technical term for the sound frequencies produced when a telephonic key is pressed. DTMF, also known as touch tone, was primarily used for telephone signaling to and from the local exchange, though today it finds several applications in the field of telecommunications and call centers. A different frequency is assigned to each key in the telephone and there are two tones – one low frequency and another high frequency – that are played simultaneously when a key is pressed. This combination of two tones makes it nearly impossible to reproduce by the human voice. Each of the four rows of keys in a telephone is assigned a low frequency tone and each of the three columns is assigned a high frequency tone. A fourth column of keys labeled as A, B, C, and D is optional and is mostly used in military networks. 2 © Specialty Answering Service. All rights reserved. 2 History and Evolution Before DTMF was introduced, telephone networks were dependent on pulse dialing. In pulse dialing, pulses are generated by rapidly connecting and disconnecting the telephone connection.
    [Show full text]