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Topic: Data communications

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  ANSDIT - The letter "D"
The arrangement of data in a storage device and implementation of an access method that are in accordance with the data structures of files and of their records and that provide for these records to be part of a database.
Between a data station and a data switching exchange or data concentrator, the data circuit includes the DCE at the data station end, and may include equipment similar to a DCE at the data switching exchange or data concentrator location.
The transfer of data among functional units according to sets of rules governing data data transmission and the coordination of the exchange.
www.ncits.org /tc_home/k5htm/d1.htm   (1990 words)

 DATA-LINC MODEMS: How to Improve Industrial Data Communications
This means that data communications equipment must be compatible with or adjustable in order to interface and function with many different devices.In addition to standard RS-232, many devices use RS-422 or 485 digital interfaces.The communications devices must also deal with different word lengthsand special attention pulses.
Some data communication tasks are only point-to-point but many more involve multiple remotes controlled from a central location.The data communications devices must operate in a multi-drop mode, in most instances providingcarrier control so that only one responding carrier is on at one time.
Data communications problems are thereby dealt with effectively because of this unique characteristic of a CM signal.
www.data-linc.com /articles/cearticl.htm   (2550 words)

 Data Communications   (Site not responding. Last check: 2007-10-08)
Data Communications is the transfer of data or information between a source and a receiver.
Data Communication is interested in the transfer of data, the method of transfer and the preservation of the data during the transfer process.
The purpose of data communications is to provide the rules and regulations that allow computers with different disk operating systems, languages, cabling and locations to share resources.
www.thelinuxreview.com /howto/intro_to_networking/c52.htm   (149 words)

 Data Communications Basics
The distance over which data moves within a computer may vary from a few thousandths of an inch, as is the case within a single IC chip, to as much as several feet along the backplane of the main circuit board.
Data is typically grouped into packets that are either 8, 16, or 32 bits long, and passed between temporary holding units called registers.
To transfer data from one register to another, the output conductors of one register are switched onto a channel of parallel wires referred to as a bus.
www.camiresearch.com /Data_Com_Basics/data_com_tutorial.html   (4380 words)

 Sangoma - Sync & Async Tutorial   (Site not responding. Last check: 2007-10-08)
The accurate decoding of the data at the remote end is dependent on the sender and receiver maintaining synchronization during decoding.
In synchronous communications, data is not sent in individual bytes, but as frames of large data blocks.
The clock is embedded in the data stream encoding, or provided on separate clock lines such that the sender and receiver are always in synchronization during a frame transmission.
www.sangoma.com /sync&a.htm   (853 words)

The prime operational communications data are formatted into 4,800-bit blocks and transmitted on the Nascom wide-band data and message switching system.
Shuttle data from all the tracking stations are funneled into the main switching computers at GSFC and rerouted to JSC without delay by domestic communications satellites.
Data acquired by the satellites are relayed to the ground terminal facilities at White Sands.
science.ksc.nasa.gov /shuttle/technology/sts-newsref/sts-jsc-comm.html   (3945 words)

 What is communications? - A Word Definition From the Webopedia Computer Dictionary
For example, modems, cables, and ports are all communications devices.
Communications software refers to programs that make it possible to transmit data.
The ACTS Programme (Advanced Communications Technologies and Services) represents the European Commission's major effort to support precompetitive research and technological development in the context of trials in the field of telecommunications during the period of the Fourth Framework Programme of scientific research and development (1994-1998).
www.webopedia.com /TERM/c/communications.html   (413 words)

 RS232 Tutorial on Data Interface and cables
Data is transmitted and received on pins 2 and 3 respectively.
Data Set Ready (DSR) is an indication from the Data Set (i.e., the modem or DSU/CSU) that it is on.
Data Carrier Detect (DCD) indicates that a good carrier is being received from the remote modem.
www.arcelect.com /rs232.htm   (2828 words)

 TelecomWriting.com: The North American Data Communications Museum Page
"Data Communications Technology from Telegraph to Digital Transmission." The main location is in San Diego, California, but properties in four other cities house parts of their collection.
The North American Data Communications Museum (NADCOMM) is committed to the project of collecting, displaying, and operating the equipment which has powered the communications revolutions of the twentieth century, from telegraphy to digital telephony.
NADCOMM's goal is to counter the present state of communications history, marked by the quick and successive obsolescence of "last year's models," by maintaining a working collection of functional equipment tracing the stages through which teletechnology has passed.
www.privateline.com /NADCOMM   (397 words)

 Data Acquisition and Control. Data Communications. Data Acquisition. Signal Conditioning. Signal Conditioners. Daq. 5B ...
Worldwide, our electronic data acquisition, signal conditioning, and data communication products provide rugged signal and data integrity and wide spectrum accuracy.
Data communications system lines run long distances and are exposed to hazards.
Data communications systems must function among electrical transients and noise, ground loops, and lightning strike.
www.dataforth.com   (202 words)

 Data Communications FAQ (Windows Version)
Add-on high speed data communications cards with 16550A (or equivalent) UARTS are also available at your local computer store at prices ranging from $20 to $75 depending upon the number of ports and other features.
It is important to understand the difference between "line speed" (the speed with which your modem talks to the other modem), and Data Terminal Equipment or "DTE speed" (the speed with which your PC talks to the modem).
The communications link falls back to progressively slower speeds such that a 28,800 connection may actually be running at 9,600 after half an hour or so.
www.malch.com /comfaq.html   (3820 words)

 A Brief History of Data Communications   (Site not responding. Last check: 2007-10-08)
By the time of the Civil War, telegraph communications spanned the United States, and in 1866, the first trans-Atlantic cable was laid between the US and France (Werner von Siemens from Germany was one of the pioneers in the development of reliable submarine cables).
Data messaging networks evolved, to allow individuals to communicate with each other in a digital format.
Local Area Network deployment accelerated, offering users a new view of data communications networking; the ability to access anything from anywhere, bandwidth-on-demand for data transfers, standardized connectivity, etc. The migration of computer networks has shifted from "Centralized host" to "Client-Server" architectures.
telecom.tbi.net /history1.html   (2557 words)

 Simple infrared data communications
DAT is the data (byte) that will be transferred to the Stamp port pins P8 to P15.
When IR data is received, you can verify reception visibly by watching the LED's count from 0 to 255.
The HT-12D decoder IC will go into low power or sleep mode when the data input pin is at ground conserving power in the receiver circuit until data is being received.
www.rentron.com /Infrared_Communication.htm   (2375 words)

 Speakeasy - Broadband Voice and Data Communications
The copper loops that connect most American households to local telephone central office (CO) switches were not designed for data traffic, particularly high-speed data traffic.
Some of these loops have been unused for 50 years, and others are equipped with electronics designed for efficient voice communications.
But the electronics that enhance voice communications are murder on data transmission (microfilters installed to eliminate noise or hiss on voice lines disrupt frequencies used for data).
www.speakeasy.net /press/news/news012201.php   (706 words)

 Navas Cable Modem/DSL Tuning Guide
TCP is a packet-based protocol where data is transmitted in variable-sized blocks, typically with a maximum size of 500-1500 characters (usually 1500 characters for Cable Modem or DSL).
If each data packet had to be acknowledged before another could be sent, then performance could suffer due to the delay time needed for the data packet to reach the receiver plus the time needed for the acknowledgment packet to get back to the sender.
To avoid this delay, the sender is allowed to keep transmitting data packets prior to receiving acknowledgments up to a maximum "window" size advertised by the receiver, normally large enough for several packets.
cable-dsl.home.att.net   (7090 words)

 Open Directory - Computers: Data Communications: Installation   (Site not responding. Last check: 2007-10-08)
Dataplus Communications - Specializing in the design, installation, and service of low voltage cabling and wireless technology in the Las Vegas area.
ICOM Voice and Data Communications - ICOM, Inc. specializes in the design and installation of LAN cabling and communications systems.
Td Communications, Inc. - Td Communications, Inc. is a small cabling company in the San Francisco Bay Area specializing in the installation, termination and testing of voice and data cabling for small and large businesses.
dmoz.org /Computers/Data_Communications/Installation   (2816 words)

 L&M Data Communications - ¿Quiénes somos?
LandM Data Communications es la única empresa en nuestro país que se dedica exclusivamente a la formación en las tecnologías de Comunicaciones de Datos, con el objetivo de que los profesionales consigan implantarlas y mantenerlas con calidad y eficiencia.
La formación que ofrece LandM Data Communications se estructura en una serie de Áreas de formación, cada una de ellas resuelve individualmente las necesidades de formación de aquellos profesionales que necesitan dominar las diversas tecnologías y, en su conjunto, constituyen una formación completa en el área de los sistemas de información y comunicaciones.
La colección Data Communications Reports contiene información rigurosa, adaptada a los servicios de nuestro país y es un magnífico complemento a su formación.
www.lmdata.es /c_quien.htm   (855 words)

 Conquest Communications Group Home
Conquest Communications Group provides message consulting and direct contact services to political campaigns and business organizations throughout the United States.
Conquest's expert team has played a part in producing thousands of campaign plans, message deployments, and data research projects.
We can build a winning strategy for your organization and help you develop a budget and timeline that will put you on the road to success.
www.conquestcd.org   (266 words)

 Secure Instant Messaging
IMiN™ is a fully scalable and secure instant messaging and communications software solution adopted by some of the top financial, legal, gaming and entertainment businesses.
Available through our network of channel partners and alliances, IMiN™ secure instant messaging software is the most secure, simple and scalable instant messaging solution available in the market for business.
Users can easily communicate with each other across the network – whether down the hall or across the world.
www.ebs-imin.com   (212 words)

 Amazon.com: Books: Data & Computer Communications (6th Edition)   (Site not responding. Last check: 2007-10-08)
Provides a clear and comprehensive survey of the whole field of data communications and a tutorial on leading-edge network technologies and protocols.
The subject of Networking and Data communication is hard to teach and the good books are also hard to find.
Although this is only my second required textbook in the Networking and Data communication, one undergrad and now grad school, it is my...probably 10th book to read/use as a reference in my daily tasks.
www.amazon.com /exec/obidos/tg/detail/-/0130843709?v=glance   (1899 words)

 data communications
In popular usage, it is said that data communications make it possible for one computer to “talk” with another.
Telephone circuits are often used to transfer data, although their relatively limited bandwidth makes them relatively slow paths for data.
SBC Communications Announces Multimillion Dollar Contract to Provide Voice and Data Services to the Golden 1 Credit Union; New Contract Expands Relationship to Include Optical and Data Networking Services.
www.infoplease.com /ce6/sci/A0814716.html   (377 words)

 Data Communications: Globalstar
Globalstar data communications allow businesses the power to access, send and receive data from remote areas around the world.
The Globalstar Special Purpose Data Modems are an ideal solution for collecting essential data without the expense of sending crews into the field.
Simplex Modem- The Globalstar Simplex Modem or Simplex Transmitter Unit (STU) is designed to deliver reliable one-way digital data communications for remote sensing and monitoring applications.
www.globalstarusa.com /en/data   (260 words)

 Data Communications :: Globalstar
GS 4000 - The GS-4000 Robust Globalstar Modem (GS-4000-RGM) is a general purpose data modem for the Globalstar satellite network.
Companion Star - The Companion-Star(tm) is a robust and advanced GPS locator, data logger, TCP/IP communications host and a personal safety device which plugs into the Globalstar 1600 phone or car kit data cable (not included; available from your Globalstar dealer).
The data is received by Guardian Mobility's BackOffice system, processed and forwarded to you by cell phone, email, server or fax.
www.globalstar.ca /en/content.php?cid=700   (684 words)

 Army Technology - Innovative Concepts - Wireless Data Communications
Innovative Concepts is a communications technology development firm specializing in the research, design, development, production, and support of wireless data communications products and services for the defense community.
The IDM V304™ is a lightweight tactical modem and router providing digital data connectivity between and among airborne and ground platforms.
The MIDM™ is a network router between MBITR radios enabling a data communications link for all operating components on the battlefield.
www.army-technology.com /contractors/navigation/innovative   (1087 words)

 IEC: OFDM for Mobile Data Communications
Orthogonal frequency division multiplexing (OFDM) is a communications technique that divides a communications channel into a number of equally spaced frequency bands.
Only recently has it been finding its way into commercial communications systems, as Moore's Law has driven down the cost of the signal processing that is needed to implement OFDM–based systems.
It is important that the overall system design be well matched to the service profiles to maximize the performance of the system and balance the ultimate user experience it provides relative to the cost to the operator.
www.iec.org /online/tutorials/ofdm   (372 words)

 Top Speed Data Communications®
We are pleased to present our easy-to-use online data circuit quoting and ordering service for local and long distance carriers.
As authorized agents of the largest providers of business data and voice circuits, we offer the best of services at competitive rates.
top names in voice and data lines for business, As authorized agents, we work directly with the carriers for unbeatable service and value.
www.topspeeddata.com   (215 words)

 Data Key Communications, LLC
Data Key Communications, LLC makes it easy to present, sell, teach and communicate online.
Building Blocks can be added when you are ready to expand your success to the next level.
No matter what your need, Data Key Communications can provide you with an outstanding solution for your business-to-business communications.
www.datakeyllc.com   (117 words)

 Lee Data Communications   (Site not responding. Last check: 2007-10-08)
MADE IN THE U.S.A. Lee Data Communications designs, manufactures and sells a broad range of fiber optic equipment including fiber optic modems with video and/or audio transmission and reception capabilities.
In addition, LDC offers superior data communication devices, industrial control products, telecommunication carrier links as well as preterminated fiber optic cables.
As a symbol of LDC's pursuit to produce the most trouble-free fiber optic communication equipment, all products are backed by a five year warranty.
members.aol.com /johannlee/lee-data.htm   (168 words)

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