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94 results on '"Data communications -- Design and construction"'

1. Power-efficient copper access

Author

Guenach, Mamoun, Nuzman, Carl, Maes, Jochen, Peeters, Michael, Li, Yan, Van Bruyssel, Danny, and Defoort, Frank

Subjects
Energy efficiency -- Management, Data communications -- Energy use, Data communications -- Design and construction, Company business management, Science and technology, Telecommunications industry
Abstract

A study was conducted to identify measures that would help maintain power efficiency in copper access technology. It is believed that power consumption can be reduced by exploiting currently available features. The development of an advanced, scalable, joint optimization of power allocation to tones on multiple lines is also explained.

Published
2010

2. Optical transport network evolving with 100 Gigabit ethernet

Author

Roese, Josef, Braun, Ralf-Peter, Tomizawa, Masahito, and Ishida, Osamu

Subjects
Telecommunications services industry, Ethernet, Technology application, Deutsche Telekom AG -- Technology application, NTT Communications Corp. -- Technology application, Data communications -- Capacity, Data communications -- Standards, Data communications -- Design and construction, Telecommunications services industry -- Technology application, Communications industry -- Technology application, Ethernet -- Standards, Ethernet -- Capacity, Ethernet -- Usage
Published
2010

3. Window-based and rate-based transmission control mechanisms over space-internet links

Author

Wang, Ruhai, Gutha, Bhanu, and Rapet, Paradeshkumar V.

Subjects
Algorithms -- Analysis, Aircraft communication -- Research, Data communications -- Design and construction, Communications controllers -- Design and construction, Algorithm, Aerospace and defense industries, Business, Computers, Electronics, Electronics and electrical industries
Abstract

Space communications urgently need an effective transmission control mechanism. This paper presents an experimental, comparative analysis of window-based transmission control, rate-based transmission control, and a hybrid of the two over error-prone, congestion-free, high-latency, point-to-point space communication links simulated using the space-to-ground link simulation (SGLS) test-bed. The results revealed that the traffic shaping mechanism of rate-based transmission protocol is more effective than the bursting flow of window-based protocol over simulated space communication links with a high error rate and a long link delay. The window-based transmission mechanisms show performance degradation due to traffic bursts and frequent packet retransmissions caused by their acknowledgment (ACK)-clocked transmission control algorithms. Pure rate-control is always preferable to other mechanisms in the simulated congestion-free, error-prone, point-to-point, geostationary-Earth orbit (GEO)-space communication channels, and its advantages become more pronounced when the channel rates are asymmetric. The performance differences come from their different behavior in controlling data transmission.

Published
2008

4. Joint rate and power adaptation for type-I hybrid ARQ systems over correlated fading channels under different buffer-cost constraints

Author

Djonin, Dejan V., Karmokar, Ashok K., and Bhargava, Vijay K.

Subjects
Markov processes -- Evaluation, Adaptive control -- Methods, Data communications -- Design and construction, Business, Electronics, Electronics and electrical industries, Transportation industry
Abstract

We present a general framework for the computation of the optimal scheduling policies for delay and overflowconstrained joint rate and power adaptations for type-I hybrid automatic-repeat-request systems. This framework can be applied to adaptive resource-allocation problems on correlated flat-fading or frequency-selective fading channels for bursty nonconstant packet arrivals. It is shown that the optimal-rate and powercontrol laws can be obtained by solving the formulated Markov decision process problems. We consider two cases for packet scheduling over wireless channels that are of significant practical importance. In the first case, we assume that the transmitter perfectly knows the channel-state information (CSI) at the beginning of the transmission. The transmitter is also provided with the decoding result for the previous transmission in terms of observation feedback at the end of the transmission. Second, we consider the scheduling problem when the transmitter does not know the CSI at the time of transmission, but it makes the transmission decision based on the history of previous transmissions and corresponding outcomes. In both cases, our objective is to minimize transmission power, and the optimal policies are computed under two different buffer-cost constraints, namely, the average buffer delay and the average packet overflow rate. The results of this paper are of importance for the development of modern wireless standards that support heterogeneous multimedia and Internet traffic with certain application-dependent-delay and packet-dropping requirements. Index Terms--Adaptive type-I hybrid automatic repeat request (ARQ), finite-state Markov channel (FSMC), joint transmission rate and power adaptation, Markov decision process (MDP), nonconstant bursty traffic, packet scheduling, partial channel-state information (CSI).

Published
2008

5. Analysis of channel-adaptive packet transmission over fading channels with transmit buffer management

Author

Yang, Hong-Chuan and Sasankan, Sanal

Subjects
Markov processes -- Evaluation, Adaptive control -- Methods, Modulation (Electronics) -- Methods, Data communications -- Design and construction, Business, Electronics, Electronics and electrical industries, Transportation industry
Abstract

In this paper, we study the performance of a channeladaptive packet transmission system over fading channels with a finite transmit buffer. This transmission scheme combines the essential features of two popular communication techniques, namely adaptive modulation and coding (AMC) and automatic repeat request. Our joint design takes into consideration the size limitation and the dynamic variation of the transmit buffer. Specifically, we introduce a novel buffer-assisted mode selection strategy for AMC in addition to the traditional channel-quality-based strategy. We also developed three buffer management schemes. Moreover, we develop a Markov-ehain-based analytical framework to investigate the performance, efficiency, and complexity of this transmission system with different mode selection strategies and buffer management schemes. This general framework allows us to derive the accurate analytical expressions for the packet loss, average delay, spectral/power efficiency, and average feedback load of this system over general fading channel. The selected numerical results, together with the related discussion, illustrate the various design tradeoffs. Index Terms--Adaptive modulation, automatic repeat request (ARQ), cross-layer design, Markov chain.

Published
2008

6. Adaptive transmission with linear computational complexity in MIMO-OFDM systems

Author

Luo, Zhendong, Gao, Hong, and Liu, Yuanan

Subjects
Algorithm, Algorithms -- Usage, MIMO communications -- Research, Data communications -- Design and construction, Communications circuits -- Design and construction
Abstract

A novel adaptive transmission scheme is proposed to improve the computational efficiency of conventional adaptive algorithms for multiple-input multiple-output orthogonal frequency-division multiplexing systems. By exploiting the stationary ergodicity of subchannel amplitudes, the proposed scheme can reduce the complexity of any existing adaptive algorithms to a considerably low level that is linear in the number of subchannels, while it causes little performance degradation. Index Terms--Adaptive transmission, fading channels, multiple-input multiple-output (MIMO) systems, orthogonal frequency-division multiplexing (OFDM).

Published
2007

7. On the error exponent and the use of LDPC codes for cooperative sensor networks with misinformed nodes

Author

Yang, Zhiyu and Tong, Lang

Subjects
Information theory -- Research, Data communications -- Design and construction, Data entry -- Equipment and supplies
Abstract

The problem of retrieving information by a mobile access point from a sensor network where sensors cooperatively transmit messages using a common codebook is considered. It is assumed that there is a probability that a sensor is misinformed with a wrong message, which complicates the information retrieval process. The access point uses the capacity achieving stay-k scheduler that schedules a sensor to transmit for k consecutive code-letters before switching to a new sensor. The random coding exponent is derived as a function of k, and it is shown that there is an optimal k that gives the largest error exponent. The application of low-definition parity-check (LDPC) codes is considered next. It is shown in simulations that the optimal k of the stay-k scheduler for LDPC codes can be inferred from that for the random coding exponent. Index Terms--Cooperative transmission, error exponent, low-density parity-check (LDPC) codes, sensor networks.

Published
2007

8. CMA-Based Channel Estimation for Space-Time Block Coding Transmission Systems

Author

Xu, Changjiang and Le-Ngoc, Tho

Subjects
Algorithms -- Usage, Data communications -- Design and construction, Personal communications services -- Research, Algorithm, Personal Communications Services, Engineering and manufacturing industries
Abstract

Byline: Changjiang Xu (1), Tho Le-Ngoc (1) Keywords: transmit diversity; space-time block coding; constant modulus algorithm; channel estimation; wireless communications Abstract: In this paper, we present channel estimation methods for space-time block coding (STBC) transmissions using constant modulus algorithm (CMA). The channel estimates are directly calculated from the convergence value of the CMA. Two algorithms using the channel-vector-based and channel-gain-based constant modulus (CM) criteria are proposed. An approximation of the CM cost function is introduced to allow the use of the recursive least-square (RLS) technique in designing fast RLS-CMA's. Performance of the proposed schemes is evaluated and compared with others using simulation. Illustrative results show that the proposed scheme outperforms the cross-correlated method and can approach the performance of the training-based method. Author Affiliation: (1) Department of ECE, McGill University, 3480 University Street, Montreal, Quebec, Canada, H3A 2A7 Article History: Registration Date: 04/10/2004

Published
2004

9. Coherent detection for T-DMB receivers in hierarchical modulation mode

Author

Kim, Ji-Hyun, Lee, Ji-Bong, Kim, Hyoung-Nam, Lim, Hyoungsoo, and Lim, Jong Soo

Subjects
Data communications -- Design and construction, Error recovery -- Methods, Error handling, Business, Electronics and electrical industries, Engineering and manufacturing industries
Abstract

Hierarchical modulation has been considered for achieving higher data rates in Terrestrial-DMB (T-DMB) systems, which yields man-made noise caused by the shortened symbol distance. Such noise may produce a serious problem on a fast-fading channel for the proper operation of conventional T-DMB receivers using noncoherent differential detection because it can increase the required SNR larger than the securable SNR of the receivers. To overcome the weakness of being susceptible to fast fading of the noncoherent detection, we propose a novel decision-directed channel estimation method for the coherent detection of phase correction. In the proposed method, least-squares channel estimation is carried out with hard-decision symbols due to the absence of known pilots and then the estimated coefficients are exponentially averaged using a forgetting factor to compensate for the probable inaccuracy of the instantaneous estimation. Simulation results show that the proposed method secures higher data-rate transmission of advanced T-DMB systems by reducing the degradation caused by hierarchical modulation and fast fading. Index Terms--T-DMB, hierarchical modulation, channel estimation, OFDM.

Published
2007

10. Robustly recover data across multiple data-comm standards: multibyte framing in deserializing devices solves real system problems not defined in the standards for which they claim compliance

Author

Getty, Cory and Kettwig, Erin

Subjects
Data communications -- Design and construction
Abstract

A system engineer's worst nightmare: transmitting a misinterpretation of data in a large block of serial data. If it doesn't corrupt the entire data stream, it forces the transmitting system […]

Published
2005

11. Architectures for convergence

Author

Audin, Gary

Subjects
Data communications -- Forecasts and trends, Data communications -- Design and construction, Market trend/market analysis, Business, Business, general, Telecommunications industry
Abstract

Which definition of Convergence do you accept? All information media on one network? All applications on one network? Wired combined with wireless transmission? Public combined with private networks? Or business [...]

Published
2004

12. Winning VoIP solutions; World Cup, U.S. enterprises opt for multifunction communications technology. (Special focus: Voice over IP)

Subjects
Cable television/data services, Computer-telephone integration, Company business planning, Integrated voice/data, Telecommunications services industry, Open application interface, Online services, Avaya Inc. -- Services, International Federation of Association Football -- Planning -- Services, World Cup (Rugby football) -- Planning, Data communications -- Design and construction, Integrated voice/data -- Services, Telecommunication systems -- Design and construction -- Services, Computer networks -- Design and construction -- Services, Sports franchises -- Services, Online services -- Services, Information networks -- Design and construction -- Services, Telecommunications services industry -- Services, Computer-Telephone integration -- Services, Football (Professional), Communications industry -- Services
Abstract

Consider Gerard Gouillou's position. The general manager and chief information officer of the Federation Internationale de Football Association (FIFA) World Cup Association wanted a network for the 2002 FIFA World […]

Published
2002

13. Communicating globally

Subjects
System design, CAD/CAM/CIM system, Computer systems integration, Company business management, Client/server architecture, Network integration, Data communications -- Design and construction, CAD-CAM systems -- Design and construction -- Usage, Computer networks -- Usage -- Design and construction, Client/server architecture -- Usage, Information networks -- Usage -- Design and construction, Computer systems integration -- Management -- Usage, System design -- Usage, Systems analysis -- Usage
Abstract

The network connects business partners around the world, enabling them to send and receive data, access files, and communicate with each other. Companies with world-class engineering operations can be found […]

Published
1992

14. DSOs and logic analyzers inch their way up the ISO protocol stack

Author

Leibson, Steven H.

Subjects
International Organization for Standardization -- Standards, Data communications -- Design and construction, Oscilloscopes -- Design and construction -- Standards, Testing equipment -- Design and construction -- Standards, Integrated circuits -- Testing -- Standards -- Design and construction, Semiconductor chips -- Testing -- Standards -- Design and construction, Computer network protocols, Business, Electronics and electrical industries, Standard IC, Protocol, Design and construction, Testing, Standards
Abstract

As information makes its way through communications systems, it traverses the ISO protocol stack. Consequently, of new data-communications equipment is now a matter of testing for conformance to standards based [...]

Published
1993

15. G-Link: a chipset for gigabit-rate data communication

Author

Yen, Chu-Sun, Walker, Richard C., Petruno, Patrick T., Stout, Cheryl, Lai, Benny W.H., and McFarland, William J.

Subjects
Standard IC, Integrated circuit design, Circuit designer, HP HDMP-1000 (Integrated circuit) -- Design and construction, Data communications -- Design and construction, Circuit design, Integrated circuits -- Design and construction, Semiconductor chips -- Design and construction
Abstract

Two easy-to-use IC chips convert parallel data for transmission over high-speed serial links. A special encoding algorithm ensures dc balance in the transmitted data stream. A binary-quantized phase-locked loop is […]

Published
1992

16. Networked controllers talk over power lines; enhanced spread-spectrum technique pushes control-network communications through power-line clatter

Author

Leonard, Milt

Subjects
Company business planning, Telecommunications services industry, Data communications -- Design and construction, Noise, Telecommunications services industry -- Planning, Power lines -- Design and construction -- Planning, Communications industry -- Planning
Abstract

ENHANCED SPREAD-SPECTRUM TECHNIQUE PUSHES CONTROL-NETWORK COMMUNICATIONS THROUGH POWER-LINE CLATTER. The idea of using power lines as a communications medium for control systems was conceived several years ago as a simpler […]

Published
1992

17. ISDN terminal adapter options

Author

Gulick, Dale

Subjects
PowerPC-based system, Digital communication, ISDN, SPARC-based system, MIPS-based system, 486-based system, Protocol, Home computer market, K6-based system, 680X0-based system, Integrated Services Digital Network, Data communications -- Design and construction, Telecommunication systems -- Design and construction, Digital communications -- Design and construction, Connectivity, Workstations (Computers), Microcomputers -- Design and construction, Computer network protocols
Abstract

As more and more global telephone networks are converted to digital transmission, it is natural to expect users to want to take advantage of the inherent higher data rates and […]

Published
1991

18. Frame relay meets fast packet: pact or friction?

Author

King, Graham

Subjects
Virtual LAN, Telecommunications services industry, Packet switching technology, Pre-packaged LAN, LAN, Packet switch, Frame relay, Data communications -- Design and construction, Frame relay -- Usage, Local area networks -- Usage -- Services, Packet switching -- Usage, Telecommunications services industry -- Services, X.25 Protocol -- Usage, Communications industry -- Services
Abstract

Frame relay has been dubbed 'turbocharged packet switching' and is widely viewed as the solution to LAN interconnectivity for the early 1990s. It promises to combine the key benefits of […]

Published
1991

19. Frame relay: the network-based solution

Author

Fleming, Stephen

Subjects
Telecommunications services industry, New technique, Telephone company, Broadband Internet, Frame relay, Data communications -- Design and construction, Frame relay, Broadband transmission -- Services -- Design and construction, Telecommunications services industry -- Services, New products, Communications industry -- Services
Abstract

Glossary ANSI American National Standards institute ATM Asynchronous transfer mode BISDN Broadband integrated services digital network CCITT International consultative committee for telephone and telegraph CLASS Custom local area signaling services […]

Published
1990

20. New LAN technologies attempt to break the speed barrier

Author

Schuyler, Chet

Subjects
Cellular transmission equipment, Virtual LAN, New technique, Network architecture, Telecommunications equipment, Pre-packaged LAN, LAN, FDDI, Product enhancement, Thomas-Conrad Corp. -- Product development -- Product enhancement, Datapoint ARCnet (Local area network) -- Product enhancement, Data communications -- Design and construction, Local area networks -- Design and construction -- Product enhancement -- Product development, Communications equipment -- Product enhancement -- Product development -- Design and construction, Network architecture, Fiber Distributed Data Interface Standard -- Product enhancement -- Product development, New products
Abstract

New LAN Technologies Attempt To Break the Speed Barrier Today's fastest LANs are the 10M-bps Ethernet and 16M-bps Token-Ring, but coming down the pike are new topologies that will raise […]

Published
1990

21. Ring around Rochester

Author

Martell, Larry and Short, Wallace

Subjects
Digital communication, Fiber optics, Telephone system, Telephone company, Rochester Telephone Corp. -- Services, Data communications -- Design and construction, Telecommunication systems -- Usage -- Design and construction -- Services, Digital communications -- Usage, Telephone systems -- Design and construction -- Services -- Usage, Telecommunications services industry -- Usage, Fiber optics -- Usage
Abstract

Keeping customers satisfied is the way to play the competitive game. Local exchange carriers must respond quickly and economically to the increasingly, sophisticated needs of their business customers to avoid […]

Published
1990

22. Use Spice to solve problems on high-speed digital boards

Author

Pitzalis, Jr., Octavius and Reeder, Thomas M.

Subjects
Data communications -- Design and construction, Circuit design, Software, Integrated circuits -- Design and construction, Semiconductor chips -- Design and construction, Printed circuits -- Design and construction, Computer-aided engineering, Electromagnetic interference -- Prevention, Circuit printing -- Design and construction, Business, Electronics and electrical industries, Standard IC, Integrated circuit design, Software quality, Circuit designer, Printed circuit board, Design and construction, Prevention
Abstract

Use Spice to solve problems on high-speed digital boards Until recently, high-frequency effects were of little concern to digital-board designers. Clock speeds below 25 MHz made interline crosstalk and transmission-line [...]

Published
1990

23. The role of personal computers in ISDN acceptance and deployment

Author

Pedersen, Ken

Subjects
PowerPC-based system, Computer-telephone integration, ISDN, SPARC-based system, Integrated voice/data, MIPS-based system, 486-based system, Open application interface, Home computer market, K6-based system, 680X0-based system, Integrated Services Digital Network -- Usage, Data communications -- Design and construction, Integrated voice/data -- Usage, Computer-Telephone integration -- Usage, Microcomputers -- Usage -- Design and construction
Abstract

The Role of Personal Computers in ISDN Acceptance and Deployment As with any new technology, ISDN acceptance ultimately depends on how well its proponents conceptualize and quantify its benefits. If […]

Published
1990

24. Directly modulated VSAT transmitters

Author

Kumar, Surinder

Subjects
Data communications -- Design and construction, Microwave communications -- Design and construction, Business, Electronics and electrical industries, Engineering and manufacturing industries, Telecommunications industry, Design and construction
Abstract

Directly Modulated VSAT Transmitters Introduction Private data communication networks using very small aperture terminals (VSATs) have been realized in the last few years. These networks provide a reliable and cost-effective [...]

Published
1990

25. Do you know the way to SMDS

Author

Singh, Ram and Malhotra, Vinod

Subjects
Virtual LAN, Network architecture, Pre-packaged LAN, LAN, Data communications -- Design and construction, Telecommunication systems -- Design and construction -- Services, Regional Bell Operating Companies -- Services, Local area networks -- Services, Network architecture, Metropolitan area networks -- Design and construction -- Services
Abstract

Do you know the way to SMDS? The Bell operating companies know exactly what their customers want: to be able to interconnect their local area networks (LANs) and transfer digital […]

Published
1990

26. HDSL: past, present and future

Author

Greenen, Jerry

Subjects
Telecommunications services industry, Data communications -- Design and construction, T1 communications -- Evaluation, Telephone services -- Evaluation, Telecommunications services industry, Communications industry
Abstract

HDSL has helped users cost-effectively deploy DS-1 services over copper. But that application is just one of several reasons for carriers to think HDSL In early 1992, high-bit-rate digital subscriber […]

Published
1994

27. Mixing SNA and TCP/IP? Not so fast!

Author

Strauss, Paul

Subjects
WAN, SNA, TCP/IP, Protocol, Data communications -- Design and construction, Transmission Control Protocol/Internet Protocol (Computer network protocol) -- Usage, Wide area networks -- Design and construction -- Usage, Computer network protocols -- Usage, Systems Network Architecture -- Usage
Abstract

If you had a bottle of milk and a bottle of champagne in a small refrigerator, would you save space by combining their contents into one bottle? Hardly. But most […]

Published
1993

28. Wide-area wireless data: currently available systems and applications

Author

Hogberg, Henrik

Subjects
Wireless network, Wireless LAN/WAN system, Telecommunications services industry, Wireless telecommunications service, Packet switching technology, Wireless technology, Packet switch, Velocita Wireless L.P. -- Services, Data communications -- Design and construction, Cellular telephone services industry -- Services -- Usage, Packet switching -- Usage, Wireless communication systems -- Design and construction -- Services -- Usage, Telephone services -- Usage -- Services, Mobile communication systems -- Design and construction -- Services -- Usage, Telecommunications services industry -- Services, Radiotelephones -- Services -- Usage, Wireless local area networks (Computer networks) -- Usage -- Design and construction -- Services, Communications industry -- Services
Abstract

While PCS, digital cellular, or other emerging technologies may offer corporate MIS managers a range of different options in the future, today there are really only two options for nationwide […]

Published
1993

29. Interworking: frame relay, SMDS, and cell relay

Author

Gupta, Sudhir

Subjects
Frame relay, Data communications -- Design and construction, Frame relay, Telecommunication systems -- Design and construction
Abstract

The benefits of interworking in the broadband arena are undeniable. As the mechanisms for interworking are further defined, switch vendors are developing products for the broadband environment. Sudhir Gupta Rapid […]

Published
1993

30. Fiber networks promise new life for MAN services

Author

Viren, Mike

Subjects
Fiber optics, FDDI, Data communications -- Design and construction, Technology -- Usage, Fiber Distributed Data Interface Standard -- Usage, Metropolitan area networks -- Design and construction -- Usage, Fiber optics -- Usage
Abstract

Much of the attention given to data communications over the public network has centered on wide area network technology such as frame relay and switched multimegabit data service. Indeed, data […]

Published
1992

31. A low-risk approach for implementing LU6.2 application gateways from TCP LANs

Author

Yarborough, William

Subjects
Gateway device, Virtual LAN, Mainframe computer, TCP/IP, Ethernet, Pre-packaged LAN, LAN, Data communications -- Design and construction, Ethernet -- Design and construction -- Usage, Local area networks -- Design and construction -- Usage, Gateways (Computer networks) -- Usage -- Design and construction, Mainframe computers -- Design and construction -- Usage, Transmission Control Protocol/Internet Protocol (Computer network protocol) -- Usage
Abstract

When building an LU6.2 application gateway to the mainframe on a Unix workstation that is used by PC's attached to a TCP/IP-based Ethernet LAN, there are two approaches that can […]

Published
1991

32. Taking enhanced services to the drawing board

Author

Jones, Scott and Wurzburg, Ted

Subjects
System design, Cellular transmission equipment, Computer-telephone integration, Integrated voice/data, UNIX, Open application interface, Network architecture, Telecommunications equipment, Telecommunications equipment industry, Data communications -- Design and construction, Integrated voice/data -- Research -- Methods, Communications equipment -- Design and construction, Telecommunications equipment industry -- Research -- Methods, Network architecture -- Methods -- Research, Value-added networks (Telecommunication) -- Design and construction -- Research -- Methods, System design -- Methods -- Research, Systems analysis -- Methods -- Research, Computer-Telephone integration -- Research -- Methods, Unix -- Research -- Methods
Abstract

There's an ancient Chinese curse that loosely translates to 'May you live in interesting times.' Clearly, we've been cursed. The emergence of network-based enhanced services provides interesting times for service […]

Published
1991

33. Global networking

Author

Bamberg, Ronald A.

Subjects
WAN, Packet switching technology, Cost reduction, Small business, Packet switch, World market, SOHO, Data communications -- Design and construction, Packet switching -- Usage, Small business -- Usage, Cost control -- Usage, Wide area networks -- Design and construction -- Usage
Abstract

Global Networking All of the business pundits and gurus that talk about the coming global economy are wrong. The global economy is here now -- today. There is statistical evidence. […]

Published
1990

34. RHCs to open data spigot with SMDS and frame relay

Author

Titch, Steven

Subjects
Fiber optics, Telephone company, Frame relay, Data communications -- Design and construction, Regional Bell Operating Companies -- Services -- Usage, Frame relay -- Usage, Telecommunications services industry -- Usage, Fiber optics -- Usage
Abstract

RHCs to open data spigot with SMDS and frame relay The growth of fiber optics within local exchange areas has opened the spigot for new data connectivity services. Because of […]

Published
1990

35. Ringing up new business with PBXs

Author

Wood, Lamont

Subjects
Data communications -- Design and construction, Private branch exchanges -- Design and construction
Abstract

Tap into digital PBX's data channel and unlock a wealth of information in corporate databases. Astute IS groups are using those data to create a smart phone system that dramatically […]

Published
1990

36. The bandwidth famine

Author

Wilkes, Maurice V.

Subjects
System design, Virtual LAN, Bandwidth allocation, Bandwidth technology, Fiber optics, Communications technology, Protocol, Pre-packaged LAN, LAN, Text processing software, Data communications -- Design and construction, Computer networks -- Design and construction, Local area networks, Bandwidth, Information networks -- Design and construction, Telecommunication, System design, Fiber optics, Systems analysis, Reliability, Computer network protocols
Abstract

The Bandwidth Famine Data transmission first became a topic of general discussion in the computer field in 1960. Earlier, there had been military interest centered on the SAGE project for […]

Published
1990

37. The marriage of packet and circuit switching

Author

Budar, Edsel Garciamendez

Subjects
Company business planning, Network architecture, BT North America Inc. -- Planning, Data communications -- Design and construction, Telecommunication systems -- Design and construction, Network architecture -- Planning
Abstract

The Marriage of Packet and Circuit Switching Just 20 years ago, the field of data communications was reserved for the very adventurous scientific and military communities in a handful of […]

Published
1990

39. Georgia Community Launches Wireless Broadband Service

Subjects
Wireless network, Wireless LAN/WAN system, Telecommunications services industry, Wireless technology, Broadband Internet, Data communications -- Design and construction, Telecommunication systems -- Design and construction -- Services, Wireless communication systems -- Design and construction -- Services, Broadband transmission -- Services -- Design and construction, Telecommunications services industry -- Georgia -- Services, Mobile communication systems -- Design and construction -- Services, Wireless local area networks (Computer networks) -- Design and construction -- Services, Communications industry -- Georgia -- Services
Abstract

The town of Ellaville, Ga., has rolled out its own broadband access network for its 1,700 residents, the first non-line-of-sight wireless network in Georgia. The town built the so-called Epride.net […]

Published
2002

40. Counter Demodulates Narrowband FSK Without Synchronization

Author

Navarro, A. and Rostami, M.

Subjects
Data communications -- Design and construction, Demodulation (Electronics) -- Usage
Abstract

Telecommunications Institute, Aveiro University, 3810 Aveiro, Portugal; +351 234 377900; fax +351 234 377901; e-mail: navarro@av.it.pt Frequency shift keying (FSK) is a popular digital modulation technique for data transmission. Some […]

Published
2001

41. DSL vs. cable: An Internet boxing match

Subjects
DSL, Cable television/data services, Telecommunications services industry, Online services, Broadband Internet, Cable Internet, Technology application, Data communications -- Design and construction, Cable television -- Technology application, Broadband transmission -- Design and construction, Online services -- Technology application, Telecommunications services industry -- Technology application, Cable Internet access -- Technology application, Digital Subscriber Line -- Design and construction -- Technology application, Communications industry -- Technology application
Abstract

Touting cruising speeds up to 10 times faster than integrated services digital network (ISDN) at 128 kbps, and 50 times faster than a standard 28.8 kbps dial-up modem, at a […]

Published
2001

42. ADSL fulfills the need for speed

Author

Dipert, Brian

Subjects
AT&T Inc. -- Services, Data communications -- Design and construction, Local area networks -- Design and construction -- Services, Telecommunications services industry -- Services, Digital Subscriber Line -- Services, Communications industry -- Services, Business, Electronics and electrical industries, DSL, Virtual LAN, Telecommunications services industry, Pre-packaged LAN, LAN, Design and construction, Services
Abstract

BANDWIDTH'S A WINNER, BUT INSTALLATION MIGHT BE CHALLENGING. EVERY WEEK, I SPEND MANY HOURS on the Internet, researching articles via the World Wide Web and news groups and exchanging e-mail [...]

Published
1999

43. Networking computers

Author

Smith, Martin

Subjects
Southwire Company L.L.C., Data communications -- Design and construction, Telecommunication systems -- Design and construction, Computer networks -- Design and construction, Information networks -- Design and construction, Business, Engineering and manufacturing industries
Abstract

Computers have been changing the way all companies do business for some time now. However, nowhere has their impact been greater than among manufacturers. In most plants, timely information is [...]

Published
1984

44. Data capture matches flash converter speeds

Author

Lechner, Alexander, Jessner, Hermann, and Petschacher, Reinhard

Subjects
Digital communication, Digital signal processor, Data communications -- Design and construction, Digital communications -- Analysis -- Usage, Computer engineering -- Usage, Real-time data processing -- Usage -- Analysis, Signal processing -- Usage -- Analysis
Abstract

Data Capture matches flash converter speeds Recently, the industry has enjoyed tremendous technical advances and mass approval of ultrafast analog-to-digital flash converters, fabricated with dense, oxide-isolated bipolar processes. With 100-MHz […]

Published
1988

45. Bevy of SCSI adapters bolster PC systems

Author

Phillips, Barry W.

Subjects
PowerPC-based system, Minicomputer, SPARC-based system, MIPS-based system, 486-based system, IEEE-488 interface, Printed circuit board, Home computer market, K6-based system, 680X0-based system, Computer interfaces -- Design and construction, Data communications -- Design and construction, Printed circuits -- Design and construction, Minicomputers -- Design and construction, Microcomputers -- Design and construction, Circuit printing -- Design and construction
Abstract

Bevy of SCSI adapters bolster PC systems Complex jobs that require multitasking and file serving often overwhelm the hard-disk controllers embedded in PCs. For a modest cost, however, you can […]

Published
1988

46. T1-to-PBX link yields easy phone-network expansion

Author

Durham, Stephen J.

Subjects
RAM, Data communications -- Design and construction, Random access memory -- Usage, Private branch exchanges -- Design and construction -- Usage
Abstract

T1-to-PBX link yields easy phone-network expansion At the heart of most PBXs is an all-digital time-division-multiplexed (TDM) data-exchange system with input and output codecs that translate analog speech to data […]

Published
1987

47. Coded data transceiver shares a common bus, eases system upgrading; a host of peripherals can talk on a single line using a transceiver chip that allows networks to blossom where point-to-point links once stood

Author

Cooper, Steve, Vesuna, Sarosh N., and Oskouy, Rasoul M.

Subjects
Standard IC, Data communications -- Design and construction, Computer networks -- Design and construction, Information networks -- Design and construction, Integrated circuits -- Design and construction, Semiconductor chips -- Design and construction
Abstract

Coded data transceiver shares a common bus, eases system upgrading The ever-growing need to exchange data in today's factories and offices is driving networks to evolve and expand. But as […]

Published
1985

48. At the core of the Mac-Vax network: DR Labs unwraps the Mac II and uncovers hardware connections to VAX-based networks

Author

Fegreus, Jack and Steinberg, Jeffrey A.

Subjects
DEC VAX (Minicomputer), Apple Macintosh II (680X0-based system) -- Design and construction, Data communications -- Design and construction, Connectivity
Abstract

AT THE CORE OF THE MAC-VAX NETWORK Savvy MIS managers at VAX sites can welcome the Macintosh II with open arms and a tap onto Ethernet. Fortunately for these managers, […]

Published
1988

49. A state machine handles back-end processing for clustered networks

Author

Bennett, Brian

Subjects
Data communications -- Design and construction, Computer networks -- Design and construction -- Usage, Processing modes -- Usage, Internet service providers -- Usage, Information networks -- Design and construction -- Usage, Clustering (Computers) -- Usage, X.25 Protocol -- Usage, Business, Electronics and electrical industries, Server clustering, Internet service provider, Design and construction, Usage
Abstract

A state machine handles back-end processing for clustered networks When a packet-switching integrated digital network (IDN), such as one conforming with CCITT Recommendation X.25, interfaces with a time-division-multiplexed (TDM) IDN, [...]

Published
1989

50. Fiber-optic transmitters and receivers enhance data-link performance

Author

Ormond, Tom

Subjects
Data communications -- Design and construction, Transceivers -- Usage -- Design and construction, Fiber optics -- Usage, Computer network protocols -- Usage, Business, Electronics and electrical industries, Transceiver, Fiber optics, Protocol, Design and construction, Usage
Abstract

Fiber-optic transmitters and receivers enhance data-link performance Off-the-shelf fiber-optic transmitter and receiver modules provide designers with a cost-effective way to significantly improve data-link transmission performance. Available in matched sets or [...]

Published
1988

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