Search

Most modern wired and wireless communication systems require sophisticated frequency conversion to and from baseband. Quadrature, or I/Q, modulation is used frequently to upconvert data to an IF in the [...]

The expressways of America are overrun with busy people talking on car phones. Convenience and improved quality have dramatically increased the popularity of this form of communication-especially in heavily populated, […]

Systems integrators improvise a network with imagination and available technology. Result: Low network costs and more productive oceanographers. Even ships at sea are part of the system. Systems integrators at […]

Local exchange carriers must learn to support new DLC capabilities with existing OSSs The emergence of next generation digital loop carrier (NGDLC) systems is presenting a challenge. NGDLCs were developed […]

Byline: Lynnette Luna Big LAN on campus It used to be that high schoolers looked at qualities such as academics and cost when determining which college they were going to [...]

Byline: Tim McElligott Session Initiation Protocol, or SIP, has no shortage of champions. Some of them, such as WorldCom, have begun to lay down heavy bets. dynamicsoft has bet it [...]

Welcome, fans, to 2002. We present another year of engineering, which we will again attempt to disguise as interesting reading material, with various amounts of success. While I don't often [...]

When any product is in its infancy, it's up for grabs what shape it will assume. Take cars for example. We're used to them having four wheels, a circular steering [...]

While dense wave division multiplexing (DWDM) and SONET have assisted in meeting the bandwidth and capacity requirements of Internet traffic, they cannot enable carriers to deliver new revenue generating services, [...]

Some called 2001 the worst year in history. Others characterized it as the year that switch fabrics came back into the spotlight. Still others looked at it as the final [...]

NETWORING The Defense Department has awarded two contracts potentially worth $3 billion for lifecycle management of classified and unclassified portions of the Defense Information Systems Network Global Solutions requirement. The […]

I AM A RECENT GRADUATE with no experience in the lab. I am testing a four-port WAN-adapter card. At room temperature, it transmits and receives data perfectly, rarely losing a [...]

Seven Reasons Broadband Will Become Bountiful No one really knows what broadband is. In 1990 it was 9,600-bits-per-second. Today, it is billion (gigabit). In two years, it will be 10 […]

Angle of arrival (AOA): A system that calculates the angles at which a signal arrives at two base stations from a handset, using triangulation to find location. AOA works poorly […]

MODERN telecommunications is the transmission of electromagnetic signals using technology that ultimately delivers useful information to people or machines in the form of voice, data, and video. But the essence […]

Round 2 and seconds away. Welcome to the second round of the new media prize-fight, where we still find WAP forced to play catch-up with the Internet. Early pioneers of […]

BUILDING A VOICE-OVER-PACKET SYSTEM USED TO BE A COMPLEX PROCESS OF INTEGRATING SEVERAL COMPONENTS ND PERHAPS DESIGNING ONE OR TWO OF THEM YOURSELF. TODAY'S INTEGRATED AND SOFTWARE SUITES MAKE THE [...]

Bundles are designed by using two levers: components and incentives. As the examples indicate, telecom bundle components can span a broad range. Typical offerings consist of a combination of basic […]

Microcell technology delivers big network capacity with little impact on the environment. Wireless carriers are struggling with an unusual paradox. Consumers demand consistent, dependable wireless services, but they do not […]

hot\hat\adj: Capable of entering the mainstream of telecom systems/operations in one to two years, while having sufficient development dollars and industry support to become economically viable. Despite the fact that […]

Ubiquitous VoIP call capabilities from public-to-private networks or private-to-private networks are only possible with native IP peering. However, interconnecting networks is a stringent task--one with which today's VoIP equipment architectures […]

The good news for end users is that the telephone network may now provide features in PBXs and ACDs on a generic rather than a proprietary basis. The public switched […]

The design in Fig 1 uses the Maxim MAX250 and MAX251 chip set and telecommunication-standard isolating components to provide a complete telecommunication-safety-standard isolated RS-232C interface. The MAX250 provides the TTL/CMOS [...]

To minimize problems in the planning and building of wireless digital networks, it is critical to measure the channel impulse response. When planning new digital radio networks, including personal communication […]

Trade journals are packed with new switching vocabulary and communications methodology. Technological evolution is almost a revolution, carrying office automation from the electric typewriter to electronic typewriter to word processor [...]

Network systems are among the most critical to the telecommunications infrastructure, yet only 17 months before the new millennium, two industry experts remain concerned about how well they will survive […]

Europe's mobile telecom clout at stake The European Commission (EC) has begun an effort to establish a common European position on allocation of frequencies for the next generation of mobile […]

An efficient powering design should be adopted to improve the reliability of hybrid fiber coax networks. The distribution plant's cable loop resistance is a crucial factor in determining powering design efficiency. Power supplies should be placed in front of the amplifier cascades to prevent the placement of insertion points at the cascade's end, minimize the number of active devices and limit the total number of devices using the same power supply., Hybrid fiber/coax (HFC) networks conduct ac power along the coaxial cable center conductor for a variety of purposes including supply of voltage and current to amplifiers (signal repeaters), addressable interdiction [...]

Eager to put its telephony-over-cable vision into operation, Tellabs Operations Inc. will unveil at the National Show this week a way for cable and competitive-access providers (CAPs) to offer telephony [...]

ASU teaches its students what state of the art really means State-of-the-art technology made long registration lines a thing of the past at Arkansas State University this fall. At this […]