Prices for Communications Equipment: Rewriting the Record
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Digital Loop Carrier (DLC)
Digital Loop Carrier (DLC) Definition The local loop is the physical connection between the main distribution frame in the user's premises to the telecommunications network provider. Digital loop carrier (DLC) technology makes use of digital techniques to bring a wide range of services to users via twisted-pair copper phone lines Overview The telecommunications infrastructure has undergone a great deal of change recently, and it seems that the rate of change increases exponentially as time passes. For example, DLC technology and the local loop will become more important in the future in delivering the new services that customers will require. This tutorial first addresses the history of subscriber carriers because it is important in providing clues to the future. It will then discuss some of the early next-generation digital loop carriers (NGDLC) that began to appear in the 1980s, as well as the NGDLC as a cost-effective solution for suburban and rural applications. Finally, it will explore the likely direction that loop technology will take in the future and how to enable the market for some of the more advanced services that are expected. Topics 1. History of Subscriber Carriers 2. Early Next-Generation Digital Loop Carriers 3. Next-Generation Digital Loop Carriers for Rural and Suburban Applications 4. NGDLC Applications 5. Future Directions 6. Economics 7. The Multiservice DLC Self Test Answers Acronym Guide Web ProForum Tutorials Copyright © 1/19 http://www.iec.org The International Engineering Consortium 1. History of Subscriber Carriers The history of subscriber and loop carriers is based on the initial deployment of loop electronics, which was driven primarily by transmission needs (i.e., trying to obtain better-quality transmission over longer distances). -
Solid State Relays Are Ideally Suited for Use in Flammable Surroundings, and in Environments with High Electrical and Magnetic Noise
Clare Overview Clare is a wholly owned subsidiary of IXYS Corporation, and is conveniently located close to Boston, Massachusetts, USA. Clare designs, manufactures, and markets a wide variety of semiconductor devices, and is a major designer and manufacturer of optically isolated electronic products. Clare manufactures one of the industry’s broadest lines of Solid State Relays (SSR), featuring galvanic input-to-output electrical isolation from 1500Vrms up to 5000Vrms; a wide selection of optocouplers and linear optocouplers; and optically isolated AC Power Switches. Clare SSR products are rapidly replacing electromechanical relays in many applications, making it a leading supplier to the Telecommunications, Medical, Security, Utility Metering, and Industrial Control industries. Replacing electromechanical relays with smaller, more-reliable optically isolated SSRs improves safety and lowers costs, while minimizing equipment size and enhancing overall system performance. With no moving parts, no coils, and no contacts, Solid State Relays are ideally suited for use in flammable surroundings, and in environments with high electrical and magnetic noise. For the Telecommunications Industry, Clare manufactures a broad range of products that includes phone-line interface and monitoring devices, DC Termination devices for xDSL and ISDN applications, and Central Office products. Clare’s newest entries into the Central Office market include several new Line Card Access Switch devices with high transient immunity: 1500V/ms. These robust devices have led to the development of monolithic high voltage switching ICs, powered from 3.3V digital supplies, that interface to industrial controls, instrumentation, automatic test equipment, and medical applications (see the new CPC7514). Clare’s expertise in high-voltage and power devices supports a growing line of standard devices. -
Telstra Rural and Remote Access Technologies *Numbers in Brackets Indicate a Corresponding Footnote
Telstra Rural and Remote Access Technologies *Numbers in brackets indicate a corresponding footnote. Homeline Product Features (2*) Calling Dial-up Data Call- Call- Call- Call Return Call Back Number CND- Faxstream Message- Forward 3-way Chat Infrastructure Platform Description Rate Waiting Barring *10# Busy Display Blocking Duet bank Home (9*) (1*) (CND) RADIO CONCENTRATORS, POINT-TO- POINT RADIO and FIXED WIRELESS ACCESS Analogue Radio Concentrator System (ARCS) 8 channel analogue radio concentrator (150 MHz) up to 4.8 Kbps N YY Y NNN Y N Y 15 channel point-to-multipoint radio concentrator (500 and Digital Radio Concentrator System (DRCS) 1500 MHz) up to 7.2 Kbps N YY Y NNN Y N Y TDMA point-to-multipoint radio concentrator system High Capacity Radio Concentrator IRT2000 operating in the 500 MHz and 1500 MHz bands V9.2 Up to 30 VF or data channels. up to 26.4 Kbps YY Y Y Y Y N YY Y TDMA point-to-multipoint radio concentrator system (500 MHz and 1500 MHz bands); High Capacity Radio Concentrator IRT2000 Up to 60 simultaneous VF channels or up to 30 V10.3 (equipped with ERS-C customer end) simultaneous data channels or a mix thereof. up to 26.4 Kbps YY Y Y Y YY(6*) YY Y TDMA point-to-multipoint radio concentrator system (500 MHz and 1500 MHz bands); High Capacity Radio Concentrator SWING Up to 60 simultaneous VF channels or up to 30 V3.1 simultaneous data channels or a mix thereof. up to 26.4 Kbps YY Y Y Y Y Y Y Y Y Single channel point to point analogue radio. -
Loopcare Verification Codes (0-99)
LoopCare Verification Codes (0-99) • VER 0: TEST OK • VER 0A: TEST OK • VER 0B: CPE or HIGH RESISTANCE OPEN • VER 0C: CPE or HIGH RESISTANCE OPEN • VER 0D: OPEN IN OR DSL TERM • VER 0E: OPEN OUT BALANCED OR DSL TERM • VER 0H: ROH DETECTED DURING TEST • VER 0L: NO FAULTS TO BENCHMARKED LENGTH • VER 0M: TEST OK MTU • VER 0P: PROBABLY TEST OK • VER 0R: TEST OK • VER 0T: OUT OF TOLERANCE CONDITION • VER 05: TEST OK - CHANNEL NOT TESTED • VER 6: BUSY-SPEECH • VER 11: CROSS TO WORKING PAIR- FAULT • VER 12: AC FEMF FAULT • VER 13: HAZARDOUS POTENTIAL • VER 14: CROSS TO WORKING PAIR: MARGINAL • VER 15: DC FEMF MARGINAL • VER 16: AC FEMF MARGINAL • VER 17: RESISTIVE FAULT AND DC FEMF • VER 18: OPEN OUT AND CROSS • VER 21: GROUND FAULT • VER 22: SHORT FAULT • VER 23: SWINGING RESISTANCE: FAULT • VER 24: SWINGING RESISTANCE: MARGINAL • VER 25: SHORT AND GROUND • VER 26: MDF TEST RECOMMENDED- LOW RESISTANCE • VER 27: DC RESISTANCE- MARGINAL • VER 28: SHORT OR GROUND • VER 3: OPEN IN • VER 30: SWITCH COMMON EQUIP BAD • VER 31: INVALID LINE CIRCUIT • VER 32: CANNOT DRAW DIAL TONE • VER 33: CAN'T BREAK DIAL TONE • VER 34: POSSIBLE INVALID ACCESS • VER 35: OPEN IN AND CROSS • VER 36: LINE CIRCUIT AND DIAL TONE PROBLEM • VER 37: DIAL TONE BURST DETECTED • VER 38: POSSIBLE CO WIRING ERROR • VER 39: CO EQUIP BAD - ISTF BAD - LINE CARD BAD - PROTOCOL HANDLER BAD • VER 40: CO EQUIP SUSPECT • VER 41: OPEN OUT BALANCED • VER 42: OPEN OUT IN CABLE • VER 43: HIGH RESISTANCE OPEN • VER 44: OPEN OUT 2-PARTY OR BRIDGE LIFTERS • VER 45: OPEN OUT - NEAR DROP • VER -
Bt8954 Pcmx Voice Pair Gain (VPG) Framer
network access products Bt8954 PCMx Voice Pair Gain (VPG) Framer Flexible Framer for VPG Market, Increasing PSTN Switch Capacity Utilization The Bt8954 framer forms the foundation for a complete low-cost voice pair-gain system when combined with the Conexant Bt8960 or RS8973. Creating a voice PCM interface for Codecs, the Bt8954 combines frame, overhead, and signaling information with the PCM payload for transport over a DSL interface. And the Bt8954 supports from 2-18, 64 Kbps channels or up to 36, 32 Kbps ADPCM compressed channels. When combined with the Bt8960, a 4-voice system is possible with > 5km reach without ADPCM compression. This allows high speed fax and data modems to operate above the 9600 baud limit compared with previous generation which uses 32 Kbps ADPCM systems based on ISDN U-Interface chips. V.34 data and fax modem performance is maximized through the use of single frame strobes, low jitter PLL, and long reach Conexant HDSL technology. Distinguishing Features Low Cost, High Performance • Direct PCM Interface The Bt8954 is targeted at systems that support uncompressed voice for high quality fax and data modem applications. Conexant • Supports popular PCM Codecs delivers low cost and high performance through a combination of • Payload of 2-18 64 Kbps voice channels PCM bus interface, PCM clock generation, 18 individual Codec strobes, and an internal slip buffer. • 32 Kbps ADPCM supported Since the generation of PCM clock and frame strobes is integrated • 2.048 PCM clock generation into the Bt8954, direct connection to low cost codecs such as the • 6.144, 8.192, and 20.48 MHz ADPCM clock generation • Slip buffer for single TX/RX frame sync network access products Bt8954 PCMx Voice Pair Gain (VPG) Framer 3054/3057 family is supported. -
Network Migration
Technical Report TR-004 Network Migration December 1997 ABSTRACT: This project describes network migration options for telco access networks incorporating ADSL. Different telcos will have different legacy systems, regulatory and competitive environments, broadband strategies and deployment timescales. Hence it is not feasible to make all encompassing recommendations for network migration options. This project seeks to capture the drivers that may lead a telco to consider a particular migration path. It then presents the various technical options together with the salient features, advantages and disadvantages to assist telcos in forming evolution plans for an access network that will incorporate ADSL. It is hoped that this working text will serve as a useful reference text for both the technical and marketing professionals in the ADSL Forum. Network Migration TR-004 December 1997 ©1997 Asymmetric Digital Subscriber Line Forum. All Rights Reserved. ADSL Forum technical reports may be copied, downloaded, stored on a server or otherwise re-distributed in their entirety only. Notwithstanding anything to the contrary, The ADSL Forum makes no representation or warranty, expressed or implied, concerning this publication, its contents or the completeness, accuracy, or applicability of any information contained in this publication. No liability of any kind shall be assumed by The ADSL Forum as a result of reliance upon any information contained in this publication. The ADSL Forum does not assume any responsibility to update or correct any information in this publication. The receipt or any use of this document or its contents does not in any way create by implication or otherwise any express or implied license or right to or under any patent, copyright, trademark or trade secret rights which are or may be associated with the ideas, techniques, concepts or expressions contained herein. -
Xcel and GDSL System V90 Analog Modem Support
Technical Note XCel & GDSL System V.90 Rls2 Analog Modem Support 1. Purpose This document describes V.90 analog modem performance and support with GoDigital’s XCel POTS Systems. 2. Overview of V.90 Modems and Modem Operation Standard V.90 or “56K” modems are designed to provide downstream modem speeds greater than V.34 (V.34 defined maximum of 33.6 kbps) over normal POTS lines. Because of network designs and impairment factors, there are millions of subscribers with V.90 modems not attaining high V.90 connections. The requirements for achieving a V.90 subscriber connection are: • A digital connection at one end (the ISP end); • V.90 modem support at both ends; and • Only one analog-to-digital (A-D) conversion in the direction from the source (ISP) to the subscriber Digital pair gain systems add a second analog-to-digital conversion that limit modem connections to V.34 speeds. GoDigital’s new GDSL XCel Systems with V.90 capability is designed to help restore the subscriber’s ability to attain V.90 modem speeds when a second A-D conversion is present. 3. V.90 Modem Speeds The maximum downstream V.90 speed available in North America is approximately 53.3 kbps, based on current FCC restrictions. Any connection greater than 33.6 kbps (V.34) is considered a V.90 connection. It is important to note that the initial connect speed that a modem and server establish can be significantly different from the data throughput that is actually experienced due to bit error rates experienced in the link. -
(12) United States Patent (10) Patent No.: US 6,463,126 B1 Manica Et Al
USOO6463126B1 (12) United States Patent (10) Patent No.: US 6,463,126 B1 Manica et al. (45) Date of Patent: Oct. 8, 2002 (54) METHOD FOR QUALIFYING A LOOP FOR 5.991,270 A 11/1999 Zwan et al. DSL SERVICE 6,002,671 A 12/1999 Kahkoska et al. 6,014.425. A 1/2000 Bingel et al. (75) Inventors: David M. Manica, Lafayette, CO (US); 6,058,162 A 5/2000 Nelson et al. Mark B. Edwards, Highlands Ranch, 6,091,713 A 7/2000 Lechleider et al. CO (US); Richard L. Gibson, Ellston 6,209,108 B1 * 3/2001 Pett et al. s s s 6,266,395 B1 * 7/2001 Liu et al. IA (US) 6,278,769 B1 * 8/2001 Bella (73) Assignee: Qwest Communications International OTHER PUBLICATIONS Inc., Denver, CO (US)(US International Search Report-Apr. 18, 2000. (*) Notice: Subject to any disclaimer, the term of this International Search Report-Apr. 26, 2000. patent is extended or adjusted under 35 International Search Report-May 15, 2000. U.S.C. 154(b) by 0 days. U.S. patent application Ser. No. 09/435,954, filed Nov. 9, 1999, David M. Sanderson. (21) Appl. No.: 09/435,500 U.S. patent application Ser. No. 09/448,669, filed Nov. 24, 1999, John T. Pugaczewski. (22) Filed: Nov. 6, 1999 * cited by examiner (51) Int. Cl. .......................... H04M 1/24; HO4M 3/08; HO4M 3/22 Primary Examiner Duc Nguyen (52) U.S. Cl. ................ 379,127.01; 379/104; 379/15.03; (74) Attorney, Agent, or Firm-Brooks & Kushman P.C. -
The Bell System Technical Journal
THE BELL SYSTEM TECHNICAL JOURNAL DEVOTED TO THE SCIENTIFIC AND ENGINEERING ASPECTS OF ELECTRICAL COMMUNICATION Volume 57 April 1978 Number 4 Copyright © 1978 American Telephone and Telegraph Company. Printed in U.S.A. Loop Plant Modeling: Overview By N. G. LONG (Manuscript received August 20, 1977) The loop plant is a fruitful area for operations modeling. Because it can have many configurations and detailed structures, and because over 30 percent of the total telephone work force interacts with it, it is physically and operationally complex, and modeling is often the only way to arrive at an understanding of the basic principles underlying its operation. This article provides an introduction to the loop plant modeling papers which follow and includes both a description of the loop plant and brief descriptions of the individualpapers. I. INTRODUCTION The following ten papers describe various models of the telephone loop plant. The papers cover work done chiefly during the past decade, al- though the foundations of the work are often much older. The loop plant, which is described in detail in Section II of thisover- view, is a fruitful area for operations modeling for two mainreasons. First, since the loop network must extend everywhere customersuse telephones, it is geographically dispersed and can havemany configu- rations and detailed structures. Second, over 30 percent of the total telephone work force interacts with it, to select network paths and 797 connect customers, to rearrange and repair the network, to monitor and analyze service and costs, and to design and construct network additions. In such a physically and operationally complex network, modeling is often the best-and sometimes the only-way to arrive at an under- standing of the basic principles underlying its operation. -
HTC-1100E Digital Loop Carrier System Description
HTC-1100E Digital Loop Carrier System Description September 2003 1B.1 Copyright © 2003 HitronTechnologies All Rights Reserved. This document contains information that is the property of HitronTechnologies. This document may not be copied, reproduced, reduced to any electronic medium or machine readable form, or otherwise duplicated, and the information herein may not be used, disseminated or otherwise disclosed, except with the prior written consent of HitronTechnologies HitronTechnologies 0 HTC-1100E System Description Contents NEW PRODUCT INFORMATION RELEASE .......................................................................................5 BROADBAND ADSL SOLUTION .....................................................................................................5 QUAD E1 TRANSCEIVER (QE1X-XCVR) ......................................................................................... 12 ELU-T / EBC-T................................................................................................................ 15 ELU-T / EBC-T................................................................................................................ 16 HTC-2100 ..................................................................................................................... 18 ISDN- PRI...................................................................................................................... 19 QV52 (QV52CU) .............................................................................................................. 22 LAN CARD -
Assessing High Speed Internet Access in the State of Iowa
ASSESSING HIGH-SPEED INTERNET ACCESS IN THE STATE OF IOWA A Joint Report of the Iowa Utilities Board And Iowa Department of Economic Development Submitted to the Legislative Oversight Committee of the Legislative Council in Compliance with Senate file 2433 Utilities Board: IDED Director: Allan Thoms (Chairman) C.J. Niles Susan Frye Diane Munns October 2000 ASSESSING HIGH-SPEED INTERNET ACCESS IN THE STATE OF IOWA A Joint Report of the Iowa Utilities Board And Iowa Department of Economic Development Submitted to the Legislative Oversight Committee of the Legislative Council in Compliance with Senate file 2433 IUB Project Manager and Contact: Lisa Stump Manager – Policy Development (515) 281-8825 [email protected] IDED Project Manager and Contact: Sue Lambertz Project Manager (515) 242-4922 [email protected] IUB Staff Survey Team: Data Compilation and Assessment: Ryan Stensland Stuart Ormsbee Leslie Cleveland Survey Distribution: Leighann LaRocca Kathy Bennett Linda Hatch Iowa Utilities Board Department of Economic Development 350 Maple Street 200 East Grand Avenue Des Moines, IA 50319 Des Moines, IA 50309 October 2000 TABLE OF CONTENTS Page 1.0 INTRODUCTION 1 2.0 CONCLUSIONS AND RECOMMENDATIONS 4 Conclusions 4 Recommendations 6 3.0 OVERVIEW OF HIGH-SPEED TECHNOLOGIES 8 Digital Subscriber Line (DSL) 8 Cable Modem 9 Fixed Wireless 12 Satellite Systems 15 Other High-Speed Technologies 15 4.0 IOWA UTILITIES BOARD STAFF SURVEY 18 Survey Design 19 Survey Distribution and Response 20 Survey Results 21 5.0 REVIEW OF OTHER HIGH-SPEED INTERNET ACCESS STUDIES 27 2010 Draft Report 27 Tibor/Varn Report 28 FCC’s Second Report 31 NTIA/RUS Study 36 NECA Study 37 RIITA Survey 38 NTCA Report 39 Glossary Of Terms 41 List of Acronyms 44 References 46 ATTACHMENTS Attachment A – Types and Characteristics of DSL Services 49 Attachment B – Survey Instruments 50 Attachment C – Accessibility to High-Speed Data Services 54 1.0 INTRODUCTION Prior to 1994, traffic over the Internet was largely text-based information with E- mail being the most popular.