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The road to convergence will be at least partially different for each organization. Every organization begins with unique assets, legacy operations and its own goals. There are, however, general considerations [...]

Information technologists of Entex Information Services are confident that building an Internet Protocol-based virtual private network (IP VPN) is feasible. To build this network, they listed a number of system requirements that include IPSec compliance, Radius or Novell Directory Services support, triple DES encryption, Simple Network Management Protocol support and hardware encryption. Entex Informaton Services believes that their success in building IP VPNs will provide their clients with higher-speed connectivity., IP-based virtual private networks are feasible - and who knows, someday they might be widely available! IP-based virtual private networks (VPNs) are going through the classic new-technology cycle: First they're [...]

The shift to using Internet Protocol-based virtual private networks (IP VPNs) for moving data traffic is the key to increasing the value of data services. Consequently, this will improve the profitability of communication service providers as the volume of data traffic increases. The use of IP VPNs is advantageous for both service providers and consumers because it provides tremendous cost advantage for remote and site-to-site access., Multiservice is out - convergence is in. Here's what it means for service providers and enterprises. When we talk of multiservice networks, we generally talk of technical issues: Packets per [...]

A survey conducted by the Distributed Networking Assocciates revealed that frame relay services grew significanlty from 1998 to 1999. The poll found out the users are satisfied with the cost benefits and networking stability that frame relays provide their data network, particularly in facilitating local area network traffic. However, frame relays' strong performance in the market is threatened by the emergence of other technologies such as asynchronous communications cells and Multi-protocol Label Switching standard, which is the base platform for Internet protocol virtual private networks, Frame relay has been the workhorse of VPN backbones, but it may give way to a new set of MPLS-based services. As an access service, frame relay continues to flourish. [...]

Thoughtful planners enlist internal and external participants early to ensure successful upgrades Taking a methodical approach to procuring a supervisory control and data acquisition (SCADA) system is the key to [...]

Knowledge of installation, maintenance procedures key to performance in communications systems With communications systems becoming increasingly important in pipe line supervisory control and data acquisition (SCADA) operations, a working knowledge [...]

A flexible and extendable satellite broadcasting system for the future and a prototype integrated receiver with a new demodulation LSI for the system are introduced. We named such a broadcasting system in any broadcasting channel ISDB (Integrated Services Digital Broadcasting) [1]. Taking into account the demand for high quality pictures in the multimedia era [2], great importance should be attached to achieving digital multi-channel HDTV transmission using one satellite transponder. This system employs TC8PSK (Trellis Coded 8 Phase Shift Keying) [3] as a main modulation scheme to attain a high information bit rate in the 12GHz band satellite channel. Other modulation schemes (e.g. QPSK with convolutional code) can be selected. The ISDB transmission system should also take into account a flexible combination of transmission schemes that meet broadcasters' demands, that is high spectra efficiency, and reliability against degradation of the received signal under heavy rainfall. The parameters of the transmission scheme can be varied by introducing TMCC (Transmission and Multiplexing Configuration Control).

ComNet'97, a telecommunications industry exhibition, was held in Feb. in Washington, DC. The exhibition highlighted the importance of access technology in today's rapidly evolving telecom industry. Products for managing data transmission paths across local area networks and wide area networks dominated the exhibition. Computer hardware and software for the delivery of virtual private network services were also included. Participants to the exhibition included AT&T, Diamond Lane Communications and 3Com Corp., Highlighted technologies streamline the data transmission path across LANs and WANs In retail, the three keys to success are location, location, location. ComNet '97, held last month in Washington, D.C., [...]

Surfing the Web from home is something like commuting during rush hour: You travel in bursts, pauses, and then slow motion while the traffic - not of cars and trucks, [...]

This paper describes an infrared spatial coupling system for audio/video signals and low bit data(remote control) transmission based on EIAJ frequency allocation format. This system is fabricated with a transmitter device and a pair of receiver devices.

Cable Modems Will Soon Be Delivering High-Speed Internet And Multimedia Services To Their First Customers. The Choices Of Technologies And Standards Being Made Today Will Determine Their Future Success. Cable […]

As microwave data communication systems advance into the mm-wave frequency bands, several important lessons are being learned by radio manufacturers as well as component suppliers. Many of the shortcomings of [...]

There are a lot of high-speed data services out there - and there probably is no perfect solution for customers. Just take a little of this and some of that […]

The explosion in broadband data communications can be confusing - unless you know the technologies and the players The market for broadband data communications services has exploded recently as carriers […]

The cyberspace land rush has as media giants scramble to gain direct digital access the minds and wallets of America's citizens. Over the next five years, regional telephone companies, long-distance […]

Industry analysts predict that the use of frame relays in voice and data communication networks will soon gain acceptance among network designers despite the problems associated with the use of such architectures. They are optimistic that these problems, which include limited interoperability, will not affect the popularity of frame relays. However, some sectors have expressed doubts about the capability of frame relay proponents to solve these problems., Frame relay has come a long way and is becoming accepted by the market. But if you think the challenges are over, think again. It looks like the frame relay [...]

In the last year and a half, hybrid fiber/coax technology has begun to emerge as the preferred method--for both telephone companies and cable TV companies--to deliver broadband services in the […]

The new Smith-chart program facilitates a better understanding of impedance transformation in network and transmission lines. The addition of admittances in parallel and impedances in series are easy. The Smith-chart designs the impedance matching networks and the information panel exhibits the data in different forms.

A rundown of new wireless data communications products and services, including nationwide network services, advanced pagers, and PCMCIA cards for portable computers, is presented. Communications managers may find it difficult to determine the service and device combinations that best meet their wireless communications needs. Two national radio data networks, Ram Mobile Data and Ardis Inc, are already in operation., There'll be plenty to choose from in wireless datacom. But will anyone be truly pleased? Despite the confusion that surrounds wireless data communications, you really can buy the equipment and [...]

Telecommunications system designers are going the fiber/coaxial cable route to make broadband services available to homes, offices, factories and institutions Today's fiber and twisted pair switched circuit subscriber networks consist […]

Vendors of T1 multiplexer equipment are facing a changing marketplace that requires a shift in marketing strategy. The annual sales for the traditional T1 market segment have increased at annual rates less than 5% since 1989. Growth for the local area network market has been strong and multiplexer vendors are preparing to introduce products for this sector and for wide area networks. Sales growth for the T3 market has been slow and does not require a shift in marketing strategies., Vendors in the once-thriving multiplexer and wide area network markets stand at a crossroads as they try to determine which direction to take to maintain viability. One fork in the [...]

The new standard -- the high speed serial interface -- defines a physical and electrical high-speed data communications interface between DTE and DCE. With increasing bandwidth demands placing new strains […]

The high performance demanded by business customers from the data communication services offered by local service providers have led LSPs to consider replacing its copper high-capacity infrastructure with fiber optic systems. Such a move, however, is no guarantee of continuous, error-free network operation. Other factors like protection switching, monitoring systems, redundancy, system outage detection and loop architectural constrainsts should also be taken into account.