Telecommunications access technologues page

Index

• Cable TV data
• ISDN
• Modems
• Powerline communications
• Wireless access
• xDSL (digital subscriber loop)
• Fiber to the home

The last mile, first mile, local loop, access network: Whatever you choose to call it, the meaning's the same -- that part of the telecom network that links users with broadband services. There are many techniques to do that and this page tries to cover most of them.

General information

• Copper Loop Management in a Digital Environment: Migration from an Analog to a Digital Local-Loop Network Tutorial - The copper local loop is evolving from an analog network optimized for telephony to a broadband digital network capable of delivering voice, high-speed data, and other value-added communication services
• Last Mile Broadband Technologies
• SOHO gateways: provisioning the last 10m - Broadband access, voice over data, and simplified LAN management are hot technologies in their own right. Put them together, however, and you just might have next year's most promising killer application.
• Last Mile Lexicon
• Use Forward Error Correction To Improve Data Communications - Data-intensive consumer and business applications are driving the need for speed and accuracy in data communication systems
• White Papers Prepared for CSTB's Broadband Last-Mile Technology Project - information on residential broadband investing, satellite access networks, fiber access, copper access and Internet ready buildings

ISDN

ISDN is a digital telephone line which allows normal telephone operation and data communications at speeds of 64 kbit/s and 128 kbit/s using normal home telephone wire.

• Anschlussbelegungen von ISDN Buchsen - ISDN connector wiring information
• comp.dcom.isdn Frequently Asked Questions
• Dan Kegel's ISDN Page - information and extremely comprehensive link collection
• Everything (and more) you ever wanted to know about ISDN

xDSL (digital subscriber loop)

ADSL is a DSP-based communications technology that can dramatically increase the speeds of data communications over the typical copper wiring that connects most homes and businesses to the public telephone network. ADSL can transfer daya uip to megabits per seconds speed and is particularly well suited to Internet-related communications. Besides ADLS, there are many related technologues like HDSL, HDSL2, ADSL, RADSL, VDSL and many other which are commonly usually called as DSL or xDSL technologies.

General

• A Closer Look at ATM Over ADSL
• ADSL Paper - gives a short introduction of Asymmetric Digital Subscriber Line (ADSL) transmission technology
• ADSL trims down with G.lite - ADSL must now rely on the G.lite standard for consumer appeal as computer and telephone companies push G.lite
• ADSL Tutorial by DSL Forum - Twisted Pair Access to the Information Highway
• ADSL Tutorial by Kimmo Saarela - a short introduction of Asymmetric Digital Subscriber Line (ADSL) transmission technology
• ADSL: the end of the wait for home Internet? - describers contenders for fast-Internet providing
• Advanced Management and Provisioning of Next-Generation Digital Subscriber Line (DSL) Services Tutorial
• Asymmetric Digital Subscriber Line (ADSL) - short introduction with some technical details also included
• Asymmetric Digital Subscriber Line (ADSL) Tutorial
• Comparing Integrated Broadband Architectures from an Economic and Public Policy Perspective
• Copper Subscriber Loop - overview
• Digital Subscriber Line Access Multiplexer (DSLAM) Tutorial - a DSLAM separates the voice-frequency signals from the high-speed data traffic and controls and routes digital subscriber line (xDSL) traffic between the subscriber's end-user equipment and the network service provider's network
• DSL LIFE: The Consumer's Guide to xDSL Technology
• DSL Technology - Where High Speed Data Communications Can Be Provided Over Unshielded Twisted Pair Copper Cable Printer
• General Introduction to Copper Access Technologies
• How Digital Subscriber Line (DSL) Works
• IEEE 802.3 Ethernet in the First Mile Study Group
• Internet Security in ADSL systems
• Multiple Tenant Unit (MTU) Market Opportunity Tutorial
• Status & Issues in xDSL - gives historical & technological descriptions of the various DSL formats (DSL, HDSL, HDSL2, ADSL, RADSL, VDSL), and gives a summary of the current state or controversies within their development
• The Multihousing Glossary of DSL Technology Terms
• The SDSL Homebrew Home Page - This page was designed as a way for other isp's to save time in getting broadband access to their customers.
• VDSL Tutorial
• Very-High-Data-Rate Digital Subscriber Line (VDSL) Tutorial
• Video over DSL
• Voice over Digital Subscriber Line (VoDSL) Tutorial

Design and very technical articles

• ADSL POTS SPLITTER for Customer Premises - application note showing a typical ADSL / POTS splitter filter
• ADSL Testing Moves Out of the Lab - information on ADSL equipment testing
• ADSL Codecs: A Perspective on Integration
• Discrete Multitone (DMT) vs. Carrierless Amplitude/ Phase (CAP) Line Codes - two competing technologies in the past, nowadays DMT is the widely used system in ADSL
• Extending Asymmetric Digital Subscriber Line (ADSL) Services to Remote Digital Loop Carrier (DLC) Locations Tutorial
• Final Report on a Study to Investigate PLT Radiation - study to develop a model to predict the radiation properties of power line data transmission (PLT) and digtial subscriber loop (xDSL) systems
• Line drivers and receivers push signals through cable's reality - cable driving is an old art, but new applications such as ADSL/HDSL, cable modems, LANs, and high-resolution video require drivers and receivers that provide increased power, bandwidth, fidelity, and tolerance of line uncertainties
• Optimizing Performance In An xDSL Line Driver
• Regulatory Impact Assessment: Consultation on a Statutory Standard for Controlling Interference from DSL, PLT and Similar Telecommunications Technology
• Signal and noise levels underline ADSL line driver, receiver design - Designing the analog portions of the transmit and receive channels in ADSL systems is a sometimes complex procedure that must take into consideration the signal levels in the channel, the noise levels, and the frequency spectrums involved
• Specialized test judges DMT-amplifier performance - traditional analog test techniques and specifications, which are based on sine-wave testing, don't reflect the true performance of devices that process the discrete multitone waveform
• Spectral Compatibility of Digital Subscriber Line (DSL) Systems Tutorial - The spectral compatibility of two digital subscriber line (DSL) systems is defined by the effect of crosstalk that one DSL system has on another in cable
• Telecom drives transformers - emerging telecommunications applications like ADSL, HomePNA and cable modems are shaking up the mature transformer components marketplace
• Tone For ADSL Modems Generated By Analog Front-End - power consumption, distortion, lowe level signals and integration are challenges in ADSL equipment design
• VoDSL: The Facts Behind AAL2 - voice over DSL (VoDSL) is changing the traditional telecom landscape in radical ways

Resource pages

• ADSL Forum Web Site
• Dan Kegel's ADSL Page - lots of ADSL information
• FSAN xDSL Working Group Home Page - includes FSAN VDSL Simulation Tool and information on VDSL standardization
• VDSL Alliance
• xDSL.COM - daily xDSL news and lot's of other xDSL information

Cable TV data

Many traditionally one-way cable TV networks have nowadays converter to two-day data highways by adding two way operation to the cable TV network amplifiers and connecting cable modems to the cable TV network. Cable modems are devices that allow high-speed access to the Internet via a cable television network. While similar in some respects to a traditional analog modem, a cable modem is significantly faster.

• Broadband Bob's Cable Modem Resource Guide
• Cable Modem Resources on the Web
• Cable Modems Tutorial
• Cable System Preparation Guide for Two-Way Data - general information on plant preparation for two-way services on cable TV network, pdf document
• Cable Telecommunications Reasources
• CATV Cyberlab - cable TV and cable modem technology
• Chips and high-speed cable modems enable two-way communications - cable-modem specifications standardize high-speed, two-way communications. Now, you can use highly integrated chips to customize consumer-friendly modems for retail shelves
• Data Over Cable Interface Specifications
• Delivering Two-Way Service, A Return Path Primer - primer of basic concepts that will ensure your success in the two-way cable TV system, pdf document
• DOCSIS Summary - information on DOCSIS cable modem standard
• Introducing Cable Modems - article series
• Linux Cable Modem Info - how to use Linux with different cable modem systems
• Mike's Cable Modem Page - cable modem product list
• Sam's Interactive Cable Guide
• Voice over Cable (VoCable) Tutorial - information on cable-TV network based Internet protocol (IP) telephony

Fiber to the home

• Alloptic Technology Corner - articles on passive optical access networks
• Fiber-to-the-home starts marching to market - high-speed fiber optic connections are already reaching into the home, with the number of connections growing quickly
• IEEE 802.3 Ethernet in the First Mile Study Group

Powerline communications

Powerline Carrier (PLC) is a communication technique that uses the existing power wiring (120 Volts, 240, etc) to carry information. It is kind of "wireless" means of communication, because PLC technology can supersede the installation of dedicated wiring in some applications. Various applications use PLC technology from power company equipment controlling to computer networking.

General articles

• Alliance Leverages Home Power Outlets To Network PCs And Consumer Appliances
• Home Automation and the Power Line Carrier
• Powerline communication: wireless technology - using AC power lines to transmit data eliminates the cost of installing special wiring between distributed system elements but still powerline communication doesn't suit every application

Powerline communication sites

• HomePlug Powerline Alliance - The HomePlug Powerline Alliance (HomePlug) is a not-for-profit corporation formed to provide a forum for the creation of open specifications for high speed home powerline networking products and services.
• Powerline World: The P.L.C. Community - Powerline World is a global online community facilitating the development and deployment of Powerline Communications (P.L.C.) products and services.

Powerline communication systems and products

• Ascom Powerline Communications Products
• Domosys - power line communication ICs
• Echelon LonWorks - home automation network
• European Installetion Bus (EIB)
• Intellion - low cost networking with CEBus and and spread spectrum
• Metricom Corporation - Powerline carrier products
• Nortel Digital Powerline - claims to be able to provide fast (1Mbit/s) data connections through power line wires
• PLM-24 Power Line Modem - low cost and easy to build 2400 bps Power Line Modem kit

X-10 system

X-10 is a home auomation systgem which uses powerline communications for the communication between the master controller and the controlled automation and switching modules around the house.

• 120/240v Residential Coupling - how to get X-10 powerline communication signals from one mains phase to another
• X-10 FAQ - official FAQ
• X-10 Powerhouse Home Page - X-10 official pages
• X-10 Spec

ICs for powerline communications

• LM1893 Carrier-Current Transceiver - datasheets
• LM2893 Carrier-Current Transceiver - datasheets

Circuits

• Digital Remote Thermometer - Remote sensor sends data via mains supply, temperature range 00.0 to 99.9 °C
• Power-line Appliance Controller - student report and circuit

Interferences

• Communications via Domestic Mains Wiring Investigation for RA1/ERU - information on bech testing and field measurements
• Final Report on a Study to Investigate PLT Radiation - study to develop a model to predict the radiation properties of power line data transmission (PLT) and digtial subscriber loop (xDSL) systems
• Powerline Communications: Make Your Views Known! - Powerline Communications plans to use frequencies between 9kHz and 30MHz. Now there is an urgent need for all users of the that radio spectrum to contact authorities to inform them of RFI concern of PLC systems.
• Regulatory Impact Assessment: Consultation on a Statutory Standard for Controlling Interference from DSL, PLT and Similar Telecommunications Technology

Modems

General info

• Bell Modem Standards: Bell 103, 202T, 202S, 201 B, 201 C, 208 A, 208 B - In the 1960s and 1970s, Bell Labs created carrier standards for use with Bell equipment and lines, to accommodate customers' fledgling networks and even today a vast installed base of Bell Standard customers relies heavily on these modems
• CCITT Modem Recommendations
• Hayes AT Commands - industry standard method of communicating with and setting up a modem
• Modem connection - Tips on how to connect the modem in all circumstances, very useful tips for business travellers
• Modem Setup Information
• Modem Standards and Technologies - introduction to modulation technologies used in Bell 103/113, V.21, Bell 212, V.22, V.22bis, V.32, HST, V.32bis, V.32terbo, V.FC, V.34, 56k, x2, K56flex, V.42, V42bis, MNP
• Modem Tutorial - modem basics
• Navas 28800-56K Modem FAQ - includes many general tips for modem users
• RS-232 And Modem Connectivity
• Solving the Riddle of Worldwide Computer and Modem Use
• Solwise Guide to Computer Communications - modem standards table, fax modem table
• What You Need To Know About Modems
• World Wide Phone Guide - What you need to hook up your modem just about anywhere!

Modem controlling

• AT Command List - most commonly used modem command set
• Rockwell class 1 and 2 fax command information

Technical info

• Error correction in modems and MNP protocol
• Rockwell class 1 and 2 fax command information

High speed modems

• 56K.COM - information on V.90 and other 56K modems and how to solve problems with them
• 56 Kbps Analog Modem Technology - white paper from Compaq
• Curt's High Speed Modem Page - PC Modem News, FAQs, Files, Tips & Tricks
• Navas 28800-56K Modem FAQ - 28800 bps modem related FAQs and answers, links

56kbit/s modem technology

• K56Flex modem technology
• PCM Modem Technology: Extending V.34 - information on so-called "56k" modems
• The Official 56K Modem Web site

Modem circuits and modifications

• Fax to Faxmodem interface - use FAX machine and faxmodem as a scanner
• Patches to Nokia SABmodem - easy modification boosts up your 19.2 kbit/s 4 wire leased line Nokia SAB modem to 38.4 kbit/s high speed version

Modem design info and technical data

• Modem Technical Reference Infobase
• TDD specifications - also archived at ftp://nic.funet.fi/pub/doc/telecom/telecom-archives/technical/tdd.specifications
• RPI Modem Detection - Rockwell Protocol Interface use the host computer to do the data compression and error control, how to determine if you have one

Wireless access

• LMDS links
• Wireless local area networks - can also be used as short range access technologies

Related pages

• Internet Protocol page
• Local area networks
• Telecommunications wiring page
• Telecommunications page
• Telephone technology page
• Wireless LANs