Telephone Sets-Modular Type
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
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. -
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. -
Bell System Practices Index
BELL SYSTEM PRACTICES SECTION 460-000-006 AT & TCo Standard Issue 6, February 1979 ALPHABETIC-NUMERIC INDEX STATION, KEY, PBX, AND PRIVATE SERVICE SYSTEMS 1. GENERAL Here is a list of the symbols and the service 1.01 This section provides an alpha-numeric index manual to which they refer. of sections required for the installation and maintenance of customer product equipment and SA-Station Service Manual I apparatus. SB-Station Service Manual II SC-Station Specialties Service Manual I 1.02 This section is reissued to update the SO-Station Specialties Service Manual II alpha-numeric index. CA-Coin Service Manual I CB-Coin Service Manual II 1.03 This index combines the features of both !A-Interconnect Service Manual I alphabetic and numeric indexes. Sections IB-Interconnect Service Manual II can be located by referring first to the common KA-Key Service Manual I nomenclature or ordering nomenclature, then referring KB-Key Service Manual II to a major indention for the type of information KC-Key Service Manual III such as Identification, Installation, Maintenance, PA-Dial PBX Service Manual Reference, Service, etc., and then to the alphabetical or numerical listing. 1.04 Many of the section numbers in this index are preceded by a two letter symbol such as SA. This symbol indicates that the section is contained in a service manual in addition to the standard BSP files. NOTICE Not for use or disclosure outside the Bell System except under written agreement Printed in U.S.A. Page 1 SECTION 460-000-006 AC-TYPE (USED WITH 220-, 226-, 2220-, ADDRESSABLE -
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. -
Voip My House -- How to Quickly Distribute a Voip Phone Line to Your Entire House Voip My House How to Quickly Distribute a Voip Phone Line to Your Entire House
VoIP My House -- How to quickly distribute a VoIP phone line to your entire house VoIP My House How to quickly distribute a VoIP phone line to your entire house - Unlimited calling to U.S. and over 60 other countries - $10/month for 6 months, then $28/month - Sign up and get a $50 e-gift card - Get full details TIP: Review this entire web page article before working on your house, especially the DSL warning [§20] and Disclaimer [§23]. 1. VoIP - the new way 10. Ringer Equivalence 20. DSL warning 2. POTS - the old way Number 21. The cost of 'always 3. VoIP advantages 11. Twisted Pairs on' 4. VoIP disadvantages 12. Structured Wiring 22. More Information 5. POTS network 13. Alarm systems 23. Disclaimer interface 14. Color coding standards 24. Feedback 6. POTS phone jack 15. Safest VoIP solution 7. VoIP phone jack 17. Phone line polarity 8. The VoIP solution 18. Splicing wires 9. An ounce of 19. Verizon sucks prevention 1. VoIP - Phone service the new way VoIP = Voice over IP (internet) Most of us have high speed Internet in our homes -- so why not use the Internet to connect your whole house directly to a new (and cheaper) phone company's network? Quite simply, that is what VoIP can do for you. VoIP: 'Voice over IP': Connecting to a newer phone company's network directly (via the Internet instead of by dedicated copper wire), providing you with a device which provides phone service (a dial tone). And yes, you can connect your whole house to VoIP [§8], and you can continue to use all of the phones that you are using right now. -
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. -
Searchable PDF Index
TELEPHONE COLLECTORS INTERNATIONAL Telephone Collectors International is an organization of telephone collectors, hobbyists and historians who are helping to preserve the history of the telecommunications industry through the collection of telephones and telephone related material. Our collections represent all aspects of the industry; from the very first wooden prototypes that started the industry to the technological marvels that made the automatic telephone exchange possible. If any of this interests you, we invite you to join our organization. Look around and see what we have to offer. Thanks for stopping by! Telephone Collectors International website including become a member: http://www.telephonecollectors.org/ Questions or comments about TCI? Send e-mail to [email protected] ********************************************************************************* Books Recommended by the editors: Available now ... Old-Time Telephones! Design, History, and Restoration by Ralph O. Meyer ... 264pp Soft Cover 2nd Edition, Expanded and Revised ... A Schiffer Book with Price Guide for Collectors Available at Phoneco.com or Schiffer Publishing, Ltd., 4880 Lower Valley Rd, Atglen, PA 19310 e-mail: [email protected] ********************************************************************************** Coming Soon: TELEPHONE Dials and Pushbuttons Their History, Development and Usage by Stanley Swihart ... 2 volumes, 300 pp ea. Box 2818, Dublin, CA., 94568-0818. Phone 1 (925)-829-2728, e-mail [email protected] ********************************************************************************* -
User's Manual
User’s manual ML17928 Two-line corded telephone with caller ID/call waiting Congratulations on purchasing your new AT&T product. Before using this AT&T product, please read Important safety information on page 49 of this user’s manual. Please thoroughly read the user’s manual for all the feature operations and troubleshooting information you need to install and operate your new AT&T product. You can also visit our website at www.telephones.att.com or call 1 (800) 222-3111. In Canada, dial 1 (866) 288-4268. Model number: ML17928 Type: Two-line corded telephone with caller ID/call waiting Serial number: ________________________________________________________ Purchase date: ________________________________________________________ Place of purchase: Both the model and serial numbers of your AT&T product can be found on the bottom of the telephone base. Telephones identified with this logo have reduced noise and interference when used with most T-coil equipped hearing aids and cochlear implants. The TIA-1083 Compliant Logo is a trademark of the Telecommunications Industry Association. Used under license. Clearspeak® is a registered trademark of Advanced American Telephones. © 2011-2017 Advanced American Telephones. All Rights Reserved. AT&T and the AT&T logo are trademarks of AT&T Intellectual Property licensed to Advanced American Telephones, San Antonio, TX 78219. Printed in China. Parts checklist Your telephone package contains the following items. Save your sales receipt and original packaging in the event warranty service is necessary. -
Asymmetric Digital Subscriber Line (ADSL)
Asymmetric Digital Subscriber Line (ADSL) Definition Asymmetric digital subscriber line (ADSL) is a new modem technology that converts existing twisted-pair telephone lines into access paths for high-speed communications of various sorts. Overview ADSL can transmit more than 6 Mbps to a subscriber—enough to provide Internet access, video-on-demand, and LAN access. In interactive mode it can transmit more than 640 kbps in both directions. This increases the existing access capacity by more than fifty-fold enabling the transformation of the existing public network. No longer is it limited to voice, text, and low-resolution graphics. It promises to be nothing less than an ubiquitous system that can provide multimedia (including full-motion video) to the entire country. ADSL can perform as indicated in Table 1. Table 1. ADSL Data Rates As a Function of Wire and Distance Data Rate Wire Gauge Distance Wire Size Distance (Mbps) (AWG) (ft) (mm) (km) 1.5−2.0 24 18,000 0.5 5.5 1.5−2.0 26 15,000 0.4 4.6 6.1 24 12,000 0.5 3.7 6.1 26 9,000 0.4 2.7 Topics 1. Short History of Analog Modems Web ProForum Tutorials Copyright © 1/14 http://www.iec.org The International Engineering Consortium 2. Analog Modem Market 3. Digital Subscriber Line (DSL) 4. xDSL 5. Modem Market 6. ATM versus IP 7. CAP versus DMT 8. Future Self-Test Correct Answers Acronym Guide 1. A Short History of Analog Modems The term modem is actually an acronym which stands for MOdulation/DEModulation. -
220-, 226-, 2220-, and 2226-Type Hand Telephone Sets
BELL SYSTEM PRACTICES SECTION 502-303-1 02 AT&TCo Standard Issue 3, October 1981 220-, 226-, 2220-, AND 2226-TYPE HAND TELEPHONE SETS IDENTIFICATION, INSTALLATION, CONNECTIONS, AND MAINTENANCE 1. GENERAL 1.01 This section contains information for the 220-, 226-, 2220-, and 2226-type hand telephone sets (Fig. 1, 2, and 3). 1.02 The reasons for reissuing this section are listed below. Revision arrows are used to em phasize the more significant changes. • Add the 315B amplifier for 226A hand tele phone set • Show the 315A amplifier (MD) for 226A hand telephone sets • Change Fig. 25 and 26. 2. IDENTIFICATION 2.01 The 220A (MD), 220C, 220AL, 220AM, and 226A rotary dial and 2220B (MD), 2220C, FLOATING 2220BM, and 2226A TOUCH-TONE* dialing hand FINGER STOP telephone sets are intended for use with other compo nents and apparatus to make up a complete telephone set. Refer to Table A for identification of associated apparatus. 2.02 These handsets are presently used with the TRIMLINE* telephone, Transaction, Eleva tor, Conference, and some DESIGN LINEt decorator telephones. 2.03 They consist primarily of a plastic deck and shell, a dial, flexible circuit board (network), handset cord jack, transmitter, and receiver units. Fig. 1-220-Type Hand Telephone Set 2.04 The 220A (MD) and 2220B handsets are equipped with jacks which accept the large *Registered Trademark of American Telephone and Telegraph Company. fl'rademark of American Telephone and Telegraph Company. NOTICE Not for use or disclosure outside the Bell System except under written agreement Printed in U.S.A. Page 1 SECTION 502-303-1 02 315-TYPE AMPLIFIER COVER VOLUME CONTROL 83A2B DIAL RECALL SWITCH NOTE: 22209 AND 222081! 226A HANDSET HANDSETS HAVE SA ME , EXCEPT ROUND DIAL HAS ROTARY DIAL. -
Telephone Services for the Handicapped. Rehabilitation Monograph XXXVII. INSTITUTION New York Univ., N.Y
DOCUMENT RESUME ED 037 856 EC 005 247 kUmHOR Sullivan, Richard A.; And Others TImLE Telephone Services for the Handicapped. Rehabilitation Monograph XXXVII. INSTITUTION New York Univ., N.Y. Medical Center. SPONS AGENCY American Telephone and Telegraph, New York, N.Y. PU_,? DATE 68 NOT 152p. FDPS PRICE EDPS Price MP' -$0n 75 HC-$7070 DESCRIPTORS Audio Equipment, Equipment Evaluation, Equipment Utilization, *Exceptional Child Services, *Physically Handicapped, Sensory Aids, *Telephone Communication Systems AESTPACT A study by American Telephone and Telegraph investigated the use of standard Bell equipment in meeting the needs of the disabled for telephone service. Results revealed that all disabled persons who are able to communicate orally can initiate and terminate a call and carry on a conversation when the correct types of equipment are found, especially when push button dials are universally available or when an operator is available. The monograph presents information on the difficulties encountered in using the phone and on equipment found useful. Each phone, headset, or modification is described through words and by photographs; advantages and disadvantages are noted. Several factors influencing the choice of telephone equipment (answering in time, access, and family use) are considered. Evaluation of the patient and the equipment is discussed in regard to the amount of physical function present and the testing and matching of equipment for various disabilities. Choice of telephone, assistive devices, special services for summoning aid, use of the phone for home business, and coin phones for wheelchair users are also mentioned. (RJ) 4 sr-2S OA S. gio I 1 co° 4 ' U I I alb 0 0.4.4.