Tomi Engdahl's Telecommunication Electronics Page

• General information
• Directories
• Data communications
• High speed networking
• ISDN
• LAN
• Access networks
• Cable TV
• Cable TV data
• Modems
• Multimedia communications and videoconferencing
• Powerline communications
• Telephones
• Telecommunication wiring
• Telecommunication surge protection
• Mobile communications
• Regulations and legistlation
• Wireless LANs
• Other links

General information

• A Painless Guide to CRC Error Detection Algorithms
• Audio for Distance Learning
• Character Set Standards
• Clover Web Page - large list of telecom resources
• Communications & Telecommunications at the World-Wide Web Virtual Library
• Communication Factoids - interesting info about communications technology
• Communication Standard and Cross References - search engine and links
• Counterintelligence and Technical Security WWW Page
• Gene's Pretty Good Telecommunications Links
• Infomagic standards CD-ROM at scitsc.wlv.ac.uk - telecom standards and other standards
• Networking Information at the WWW Virtual Library
• ORNL Network Research Navigator
• SDL Specification and Description Language
• Strategic Information Resources - teleocm articles
• TELECOM Digest OnLine - telecom newsgroup archive
• Telecommunication Glossary
• Telecommunication technology documents at nic.funet.fi - telecommunication document archive
• Telecommunication Tidbits - links and information articles
• Telecom Information Resources on the Internet
• Telecom Tools - some of the most used telecom installer tools are also found in the average home tool kit
• Terminal Emulation on a PC or Macintosh, or workstation, etc., and related information...
• The Personal Area Network - how to exchange electronic data from one human body to another
• The Telecom Corner! - historical and theoretical application of information and telecommunications technologies
• The Telecommunications Terminal Equipment Directive - 91/263/EEC

Theory

• Erlang B Traffic - an be used to work out the number of lines required on a trunk group for a given traffic figure
• The dB in Communications Systems
• Traffic calculation spreadsheets - for calculating telephone traffic using Excel and Lotus, zipped file

Directories

• Broadband Guide
• Data Communications 1998 Global Enterprise Networking Directory - products, contacts, vendors, services and global distributors
• Ultimate Listing of Everything - telephone nunmber directory, e-mail directory, business directory, government agencies
• US White Pages Search
• Worldwide Telecom Directory

Operator and country code lists

• ITU-T Rec. E.164 - List of TF country codes assigned

Multimedia communications

• Desktop Video Conferencing Product Survey and Resources
• DSP's, Multimedia, & Videoconferencing
• Interactive Multimedia Related Sites
• International Multimedia Teleconferencing Consortium (IMTC)
• Introduction to Desktop Video Conferencing
• Multimedia Premises Reference Architechture - to become ANSI/TIA XXXX, check also MIS Labs TR 41.5 Specifications and Minutes
• Multi-Vendor Integration Protocol (MVIP) - widely used standard for computer telephony component integration
• Tomi Engdahl's multimedia technology page
• Videoconferencing FAQ

Data communications

General

• ASCII Character Set
• Black Box Reference Center - reference material on a wide variety of connectivity technologies
• Computers and Communications - links to companies, organizations, programs, standards and FAQs with search engine
• Data Communications Cabling FAQ
• Data communication documents in Finnish written by Tomi Engdahl
• Frame Relay and Internet Voice Systems
• High Bandwidth Web Page - ADSL, ISDN, cable modem, satellite
• How to Get Information about Networks
• Managing Network Resources From a Financial Viewpoint
• Networking Underlying Concept - information contents, time dimension, architechture and protocols
• Practical Guides - analog modems, frame relay, 56 k modems and numeric systems (binary, decimal, hexadecimal)
• Protection of RS-232 Serial Connections
• Rate Adaptation, Switching and Transmission of RS-232 Signals
• Windows Data Communications FAQ
• WIZCOM - telecom tutorials, including complete ATM tutorial

Interfaces

General

• FAQ Memos on Computers and Communication
• Field Buses
• Inter-System Ground Noise: Causes & Effects
• RS-232, RS-422 and V.35 interfaces - short description ad good picture of RS-232 connector

RS 232

• Do you need information about RS-232C? - enough of the details of the RS-232 standard to allow the construction and/or debuggging of interfaces between any two RS-232 compatible devices
• EIA/TIA-232 - basic standard info and information what has changed over the years
• Interfacing a Mac Serial Port to RS-232 Lab Equipment
• RS232 Connections, and wiring up serial devices - includes wiring for loopback and monitoring
• RS-232 Diagnosis Tech Bulletin
• RS-232 Interface - circuits, electrical characteristics, handshaking, wiring
• The Online RS-232 Cable Designer - on-line interactive guide how to wire right cable between equipments from different manufacturers

RS-422 and RS-485

• Networks for Monitoring and Control Using and RS-485 interface - article from Microcomputer Journal in postscript format, also available in rich text format
• RS 422 pinout
• What is RS485 ? - short description of RS485 interface details

Connectors

• RJ11 connector dimensions and PC Board Layouts
• RJ45 connector dimensions and PC Board Layouts

Line coding

• 2B1Q Line Code Tutorial

Circuits and datasheet

• B&B Electronics Product Data Sheets - serial communication producs, many sheets have also schematics of the product
• Commonly used RS-232 serial port cables
• Current Loop Converter - Two Channel Isolated Industrial Version, schematic in pdf format
• MAX1480 - optically isolated RS-485 IC from Maxim, datasheet in PDF format
• Optically Isolated RS-232 to RS-422/485 converter - brochure with schematic in pdf format of some converter models from B&B Electronics
• RS-232 Null Cable Wiring
• RS-232 over voltage protection circuits
• RS-232 to RS-232 Port-Powered Optical Isolator - brochure with schematic in pdf format
• RS-422 and RS-485 Application Note

IP

• A Compressed History of The Internet
• Internet Engineering Task Force - the protocol engineering and development arm of the Internet
• Introduction to the Internet Protocols
• IP Reference Library
• IP-spoofing Demystified - article from Phrack Magazine

High speed networking

• 622 Mbps Data over UTP cabling - AT&T Research Experiment Demonstration
• A Guide to Modern WAN Networking, and How it Evolved - world of ATM and Broadband ISDN
• An Introduction to the Basics of ATM
• An Overview of ATM based networks
• Asynchronous Transfer Mode
• ATM Forum - Asyncronous Transfer Mode technology
• ATM Information Page - short intorduction and links
• Building The Data High Way - article from Byte magazine
• Classical IP over ATM
• Frame Relay Forum
• Frame Relay Resources
• High Bandwidth Web Page - cable modems, ISDN, satellite, ATM, Ethernet, Frame Relay, videophones
• History of fiber optics - technology and applications
• Introduction to ATM - short introduction
• Internetworking Asynchronous Transfer Mode With The Consultative Committee For Space Data Systems Advanced Orbiting Systems Protocols
• Testing 155 Mbps Signals - measuring SDH and SONET signals using digital oscilloscope
• Video Transmission Over Broadband Networks

LAN

General

• Adding and Configuring TCP/IP in Windows 95 - overview in pdf format
• BIG-LAN/bit.listserv.big-lan FAQ - campus networking
• IEEE Project 802 - develops Local Area Network standards and Metropolitan Area Network standards
• LAN Technology Scorecard - basic figures of nearly all LAN technologies
• Network usage accounting based on RMON2
• TCP/IP Resources List - books and on-line resources
• Verkkoympäristön vianhaku - network problem finding tips in Finnish

Cabling

• Cabling testing white papers
• Data Communications Cabling FAQ
• RJ-45 connector wire colors
• Twisted pair wiring cables - traight cable for 10baseT, 100baseTX, 100baseT4 and Token Ring, also crossover cable wiring
• Twisted pair signal levels - POTS, digital telephone and LANs

Ethernet

• 10Base-T Repeater Test Suite
• 10-Mbps Ethernet
• 10BaseT Ethernet Cables: Straight-through Cable and Crossover Cable
• Charles Spurgeon's Ethernet Page - extensive collection of information about Ethernet
• Ethernet AUI to AUI cheaply
• Ethernet Codes master page - ethernet vendor codes listed
• Ethernet Connectors
• Ethernet manufacturer assigned addresses
• Ethernet Test Suites
• EtherWave White Paper - information on daisy-chainable 10Base-T ethernet from Farallon
• How to build baluns for 10Base5 Ethernet
• Measured Capacity of an Ethernet: Myths and Reality - DEC Research Report 88/4, September 1988

Fast ethernet

• 100VG-AnyLAN Application Note

Wireless LANs

• Wireless LAN/MAN Modem Product Directory
• Wireless local area networks - in Finnish
• Wireless LANs - in Finnish

Gigabit Ethernet

• Gigabit Ethernet Alliance

Misc

• PhoneNET FAQ - a way to wire Apple LocalTalk

Access networks

• ADSL deployment worldwide - this page aims to give an overview of ADSL services around the world
• ADSL: the end of the wait for home Internet? - article from EDN magazine
• ADSL, SDSL, HDSL, and VDSL Info
• ADSL/SDSL/HDSL/VDSL Vendors
• ADSL white paper from Motorola - introduction to ADSL technology
• A Slightly Technical Introduction To ADSL (Asymmetric Digital Subscriber Line) Technology
• Asymmetric Digital Subscriber Line (ADSL)
• ADSL Forum Web Site
• Copper Subscriber Loop - overview
• Dan Kegel's ADSL Page
• Discrete Multitone (DMT) vs. Carrierless Amplitude/ Phase (CAP) Line Codes
• Enhancing Copper Cable with HDSL - A Technology Brief from PairGain Technologies, Inc.
• General Introduction to Copper Access Technologies
• HDSL homework paper
• High Bandwidth Web Page ADSL List
• Recent and Past Press Releases regarding xDSL
• 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

Cable TV data

• Broadband Bob's Cable Modem Resource Guide
• Cable modem information
• Cable Modems: Technology, Strategy, And Public Policy Issues
• Cable Modem Technology Primer
• Cable Modem Resources on the Web
• Cable Modem Links at High Bandwidth Web Page
• Cable Telecommunications Reasources
• CATV Cyberlab - cable TV and cable modem technology
• Data Over Cable Interface Specifications
• Data Over Cable TV: EtherWAN Technology
• Mike's Cable Modem Page - cable modem product list
• Sam's Interactive Cable Guide

Modems

General info

• A Modem Overview - short description what modem is, how it works and info on some modem standards
• AT Command List - most commonly used modem command set
• Configuring Your Modem For Optimum Performance
• Error correction in modems and MNP protocol
• How Do I Stop my Phones From Interrupting My Modem - telephone mini-FAQ
• Modem Modulation Overview
• Solving the Riddle of Worldwide Computer and Modem Use
• Taking the 'BUZZ' out of Buzz Words - the basics of modems and Modem Standards
• USENET FAQs on modem
• What You Need To Know About Modems
• World Wide Phone Guide - What you need to hook up your modem just about anywhere!

High speed modems

• Asyncronous Communication at 28.8K BPS - V.FC and V.34 information
• Curt's High Speed Modem Page - PC Modem News, FAQs, Files, Tips & Tricks
• Modem Interoperability Tests - V.34 modems
• Navas 28800 Modem FAQ - 28800 bps modem related FAQs and answers, links
• V.34 Technology - short introduction what is V.34 modem technology

56kbit/s modem technology

• 56 Kbps Communications Across the PSTN - paper on new Rockwell modem chipset
• K56Flex modem technology
• Open 56K Forum - industry-wide coalition dedicated to achieving widespread implementation of 56-kbps analog modem technology
• PCM Modem Technology: Extending V.34 - information on so-called "56k" modems
• What is x2 modem technology ?` - information about 56k modem technology

Modem circuits and modifications

• Fax to Faxmodem interface - use FAX machine and faxmodem as a scanner
• Patches to Nokia SABmodem

Modem design info and technical data

• Modem Technical Reference Infobase
• SSI K-series modem design manual - very complete modem design guide, 900k pdf-file
• 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

Telephones

ISDN

• CICAT Resources - ISDN devellopers pages
• 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
• ISDN Wiring and Powering Guidelines NIUF 433R1-94 - Residence and Small Business in USA

Mobile communications

General

• Cellular Phone Antennas and Human Health FAQ
• Controlling Echo for Enhanced Mobile Call Quality
• Devellopment of mobile communications in Finland - in Finnish
• Worldwide Wireless Telecommunication Standards - comparision table

GSM

• Baseband-chipset for GSM Phase 2 [AD20msp410] - press release from Analog Devices
• GSM - introduction to GSM system
• GSM handset market price reports
• GSM links
• Mat's GSM Page - all kinds of information about GSM phones
• Nokia 2110 Frequently Asked Questions
• Search the EQUIPMENT IDENTITY REGISTER - you can check whether the phone has been listed as stolen, simply by entering the IMEI
• Smart Messaging - Nokia's extension to short messages

Other popular systems

• The PCS Page
• What is AMPS Cellular?

Satellite

• Lloyd's satellite constellations

Phone hacking

• Cryptanalysis of the Cellular Message Encryption Algorithm
• Interfacing to Cellular Phones
• Telecommunications Industry Association algorithm for digital telephones fails under simple cryptanalysis - press release
• The Unofficial Motorola Bible - user and programming guide for Motorola cellular and pager

Paging

• IXO paging protocol example - HyperTalk functions implement the IXO/TAP protocol sufficiently to handle numeric paging
• Paging Protocols
• POCSAG paging format, code and code capacity - featured in Line Noise section of Phrack Magazine

Satellite telephones

• Inmarsat
• Iridium LLC - international consortium funding the development of the IRIDIUM project
• IRIDIUM - Motorola's New Cellular Phone System - short introduction to specs

Other

• Cellular Digital Packet Data (CDPD)
• RF Modems for Personal Communications Systems - research report
• Signals and Measurements for Wireless Communications Testing
• TAPR - an international organization dedicated to amateur digital communications

Powerline communications

• CEBus standard - home automation network, see also introduction and http://www.eiba.be/
• CEBus Controller Card
• Echelon LonWorks - home automation network, see introduction
• Intellion - low cost networking with CEBus and and spread spectrum
• LM1893 Carrier-Current Transceiver - datasheets
• LM2893 Carrier-Current Transceiver - datasheets
• PLM-24 Power Line Modem - low cost and easy to build 2400 bps Power Line Modem kit
• Power-line Appliance Controller - student report and circuit
• PowRnet Power Line Data Communications Network Technology - no longer a consumer product
• X-10 Powerhouse Home Page - X-10 official pages
• X-10 Compatible Infrared Remote Control - application note in fdf file, includes X10 protocol description
• X10 home automation and control standard
• X-10 Spec
• X-10 Technology Transmission Theory

Telecommunication wiring

• An Introduction to Providing Your Own Telephone Wiring
• Cabling Contractors Directory - find contractors and installers geographically, directory covers USA
• Data Communications Cabling FAQ
• EIA/TIA-568A Commercial Building Telecommunications Cabling Standard - guidebook to the standard
• Home Networks
• Inter-System Ground Noise: Causes & Effects
• Know your Telecoms Connectors - Universal Service Order Code (USOC) system names for telecom connectors (covers RJ connector type numbers).
• Low Voltage Home Pre-Wire Guide
• Lucent cabling systems - earlier known ad AT&T SYSTIMAX cabling system
• Multimedia Entertainment Networks
• Neutral Wire Facts and Mythology
• RJ-45 connector wire colors
• Testing grounding conductors and grounding electrodes
• The TechWire Wiring System - information about wiring system, installation guide for RJ-45 jacks
• Tomi Engdahl's Wiring and Cabling Page
• Toxic Cabling: What You Don't Know Can Kill You
• Twisted pair signal levels - POTS, digital telephone and LANs
• UTP vs STP: A Comparison of Cables, Systems, and Performance Carrying High-Data-Rate Signals - Technical article from Lucent
• UTP vs STP: A Comparison of Cables, Systems, and Performance Carrying High-Data-Rate Signals - from former Bell Labs (now part of Lucent), also archived at http://wwwtg.mp.tudelft.nl/~jeanpaul/afstuderen/documentatie/utp1.html and http://www.anixter.com/techlib/vendor/cabling/attutp.htm
• Wiring information - telecom and mains wiring

Surge protection

Theory

• Computer Aided Design of Nonlinear Protection Circuits for Special Applications
• Information about different surge suppression devices - how to protect your telecommunication lines
• Polyphaser - surge protector product catalogues with good information
• Protection Networks for Telecommunication Systems
• Surge Protection General Information - Surge Protection Methods, What is Lightning?, shape of surge pulse
• Telephone Line Surge "Protection"
• Testing grounding conductors and grounding electrodes
• ZeroSurge surge protection information - mostly mains voltage protection information

Commercial links

• Panamax Surge Protection Catalogue - power, telecom and AV
• RC Concepts Gas Tube Protectors
• Semitron transient voltage circuit protection components
• SIDACtors application notes - pdf file which includes information about some standards
• Telebyte Lightning / Surge Protection Products

Circuits

• B&B Electronics RS-232 Modular Jack Surge Protector - in pdf format
• RS-232 to RS-232 Port-Powered Optical Isolator - brochure with schematic in pdf format
• Telephone line surge protection - information and circuits
• Telephone line surge protector circuit - also archived at ftp://nic.funet.fi/pub/doc/telecom/technical/lightning.surge.protect

Regulations and legistlation

• Telecommunication equipment approving in Finland - in Finnish
• Telecommunication regulations and legistlation in Finland
• Telehallintokeskus - Telecommunication Administration of Finland

Other links

• Cool Electronics Stuff - useful links to wireless communications, LonWorks
• The MIT List of Radio Stations on the Net

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